WO2005056642A1 - 再成形可能かつ形状回復能に優れた形状記憶性樹脂および該樹脂の架橋物からなる成形体 - Google Patents
再成形可能かつ形状回復能に優れた形状記憶性樹脂および該樹脂の架橋物からなる成形体 Download PDFInfo
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- WO2005056642A1 WO2005056642A1 PCT/JP2004/018490 JP2004018490W WO2005056642A1 WO 2005056642 A1 WO2005056642 A1 WO 2005056642A1 JP 2004018490 W JP2004018490 W JP 2004018490W WO 2005056642 A1 WO2005056642 A1 WO 2005056642A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/06—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxycarboxylic acids
- C08G63/08—Lactones or lactides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/91—Polymers modified by chemical after-treatment
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/91—Polymers modified by chemical after-treatment
- C08G63/912—Polymers modified by chemical after-treatment derived from hydroxycarboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
- C08J3/247—Heating methods
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/12—Esters; Ether-esters of cyclic polycarboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2230/00—Compositions for preparing biodegradable polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2280/00—Compositions for creating shape memory
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
- Y02P20/143—Feedstock the feedstock being recycled material, e.g. plastics
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
Definitions
- Shape memory resin which is re-moldable and has excellent shape recovery ability, and molded article comprising a crosslinked product of the resin
- the present invention relates to a shape-memory resin composition that is re-moldable and has excellent shape-recovering ability.
- the present invention also relates to a molded article comprising a crosslinked body of the molded resin composition, a deformed molded article, and a method of using them.
- shape memory alloys include pipe joints and orthodontics
- shape memory resins include heat-shrinkable tubes, laminated materials, and fastening pins.
- medical equipment such as casts.
- shape-memory resins have the following advantages: they can be processed into complex shapes, have a large shape recovery rate, are lightweight, can be colored freely, and are low in cost. Attention is being paid to expansion.
- the shape-memory resin can be deformed by applying a predetermined temperature to the resin, cooled to room temperature, and fixed in a desired shape, and then heated again to return to the original shape. It has the property of restoring.
- Shape-memory resins consist of a stationary phase, which has the force of a physical or chemical binding site (crosslinking point), and a reversible phase, which consists of a non-crosslinked part that becomes fluid above a certain temperature (Tg or melting point inside the reversible phase). It is characterized by comprising.
- Fig. 1 shows a conceptual diagram.
- the initial state (original form) consisting of a stationary phase and an irreversible phase (hard) (Fig. (A) and a partially enlarged view (b)) ) Is stored.
- the stationary phase In order to deform the molded article into an arbitrary shape, the stationary phase is not melted and only the reversible phase is melted. It is heated above the melting temperature, that is, the Tg or melting point inside the reversible phase, and transitions to the reversible phase (soft) (Fig. 3 (c)). When the deformed molded product is cooled below the Tg or melting point, the reversible phase is completely solidified and solidified in the deformed state (Fig. (E)).
- the shape of the molded article deformed to an arbitrary shape is maintained in the deformed state by the reversible phase temporarily fixed. Therefore, when the temperature at which only the reversible phase is melted by heating is reached, the resin exhibits a rubber-like property, becomes stable, and recovers its original shape (FIG. (C)). By further cooling to below Tg or the melting point, the molded body returns to the initial state of FIG.
- the stationary phase is classified into a thermosetting type and a thermoplastic type depending on the type of crosslinking, and it is known that each has an advantage and a disadvantage.
- thermosetting resin has a crosslinked structure by covalent bonds.
- advantages of the thermosetting type are excellent shape recovery and dimensional stability, which are highly effective in preventing the flow of resin, and the recovery speed is fast.
- it has the disadvantage that reshaping is impossible because of covalent crosslinking, that is, it cannot be recycled.
- trans 1,4-polyisoprene (Patent Document 1: Japanese Patent Application Laid-Open No. 62-192440) is a specific example of a conventional thermosetting resin having a shape memory property.
- This is a resin obtained by cross-linking trans-1,4 polyisoprene with sulfur or peroxide or the like.
- the stationary phase is a crosslinked site, and the reversible phase is a crystal part of trans 1,4 polyisoprene.
- this resin is excellent in shape recovery, it cannot be remolded and has poor recyclability due to covalent cross-linking as described above.
- the stationary phase of the thermoplastic shape memory resin comprises a crystal part, a glassy region of a polymer, entanglement of the polymers, metal cross-linking, and the like. Since these stationary phases melt when heated, they have the advantage that they can be reshaped, that is, recycled. However, the bonding strength of the thermoplastic stationary phase is weaker than that of the thermosetting type, which is a covalent cross-link, and thus has a disadvantage that the shape recovery force is lower than that of the thermosetting type.
- Patent Document 2 JP-A-59-53528
- JP-A-59-53528 is an example of a conventional thermoplastic shape memory resin. Entanglement of polymers ⁇ , is the stationary phase It describes that a site without entanglement becomes a reversible phase and has a shape memory property.
- this shape-memory resin has a problem that the shape recovery time is long and the molecular weight is very high, so that the processability is poor.
- Patent Document 3 JP-A-2-929114
- the stationary phase is a crystalline part
- the reversible phase is an amorphous part.
- This shape-memory resin also has a long shape recovery time.
- the tensile strength is extremely weak, it is difficult to use as a member for electronic equipment.
- a styrene-butadiene copolymer (Patent Document 4: JP-A-63-179955) is also known.
- the stationary phase is a glassy region of polystyrene, and the reversible phase is a crystal part of transpolybutadiene.
- the shape recovery time is long and the shape recovery rate is low.
- thermoplastic shape memory resin A method for improving the shape memory characteristics of the thermoplastic shape memory resin has also been proposed.
- Patent Document 5 Patent Publication No. 2692195
- the shape recovery rate and recovery are achieved by hydrogenating 80% or more of the olefinic unsaturated bonds in the ternary block copolymer similar to Patent Document 4. It is said that a shape-memory resin excellent in time can be provided.
- Non-Patent Document 1 (Masao Karaushi, “Material Development of Shape Memory Polymers”, CMC, pp. 30-43, 1989), a styrene-butadiene-based thermoplastic shape-memory resin is shaped by repeated deformation. When the memory recovery rate decreases, problems are pointed out.
- Patent Document 6 JP-A-2-258818 discloses an example in which a thermoreversible crosslinked structure is introduced into a shape-memory resin to impart moldability and recyclability.
- a thermoreversible covalent cross-linking structure a covalent cross-linking structure using an ionic cross-linking group such as a carboxyl group, a Diels-Alder reaction, and a dimerization reaction of a nitroso group is disclosed.
- Claims are a crosslinked product obtained by using a block copolymer of an aromatic vinyl monomer and a conjugated diene monomer as a base polymer and thermoreversibly crosslinking the base polymer,
- the crosslinked product The glass transition temperature (Tg) of the dissociation polymer (the base polymer) is higher than the dissociation (cleavage) temperature (Td) of the thermoreversible crosslink contained in the crosslinked product, and the glass transition temperature is 70 ° C — Characterized by being in the range of 140 ° C! /
- the dissociation temperature of the thermoreversible crosslink may be lower than the glass transition temperature of the dissociation polymer, but in practice, the dissociation temperature is the glass transition temperature of the dissociation polymer. It is preferably 10 ° C or lower.
- an aromatic resin having a Tg of about 100 ° C. functions as a stationary phase.
- crystalline gempolymer having a melting point lower than the Tg of the aromatic resin acts as a reversible phase.
- thermoreversible covalent cross-linking structure is introduced at the double bond in the diene polymer, and the bond (cross-linking) is cleaved by heating above Td. By cooling, recombination (re-crosslinking) is achieved and shape memory is obtained. By heating to a temperature higher than the Tg of the aromatic resin, moldability is improved and remolding is possible.
- this shape-memory resin as shown in FIG. 2, the resin portion serves as a stationary phase, and the cross-linking portion functions as a reversible phase ((a) in FIG. 2). Then, the cross-link is cleaved (Fig.
- this resin is of a thermoplastic type, so that an excellent shape recovery force cannot be obtained, and a usable resin-thermo-reversible bond-like crosslinked structure And the dissociation temperature of the covalent cross-linked structure is high (Diels Alder 120-160 ° C, nitroso group 70-160 ° C). Practicality is poor because the crosslinking site is limited and the temperature margin during shape memory is extremely narrow.
- Non-Patent Document 2 (Engle et al., J. Macromol. Sci. Re. Macromol. Chem. Phys., Vol. C33, No. 3, No. 239— 257, 1993), Diels-Alder reaction, nitrosoni quantification reaction, esteri-dani reaction, eye reaction Onenation reaction, urethane-dani reaction, azlatatatone phenol addition reaction are described.
- Non-Patent Document 3 (Yoshinori Nakane and Masahiro Ishidoya et al., Coloring Material, Vol. 67, No. 12, pp. 766-774, 1994);
- Non-Patent Document 4 (Yoshinori Nakane and Masahiro Ishidoya et al.)
- Patent Document 7 Japanese Unexamined Patent Application Publication No. 11-35675 describes a thermoreversible cross-linking structure using a vinyl ether group, Vol. 69, No. 11, pp. 735-742, published in 1996. Have been.
- Patent Document 8 Japanese Patent Application Laid-Open No. H11-106578 describes an example in which a reversible reaction of an acid anhydride by an esterification reaction is used to improve heat resistance and recyclability.
- a method of introducing a carboxylic acid anhydride into a conjugated product and crosslinking with a linker having a hydroxy group is disclosed.
- V and deviation are also used as shape memory resins that can easily be described as shape memory.
- Patent Document 9 Japanese Patent Application Laid-Open No. 9-221539 discloses a biodegradable shape-memory resin composed of an aliphatic polyester resin such as a polylactic acid resin. . However, since these are also thermoplastic resins, their shape recovery power and recovery speed are insufficient.
- FIG. 5 of this patent document shows shape memory by photocrosslinking and shape recovery by crosslink cleavage by heat or light.
- FIG. 5 of this patent document shows shape memory by photocrosslinking and shape recovery by crosslink cleavage by heat or light.
- Patent Document 1 JP-A-62-192440
- Patent Document 2 JP-A-59-53528
- Patent Document 3 JP-A-2-92914
- Patent Document 4 JP-A-63-179955
- Patent Document 5 Patent Publication No. 2692195
- Patent Document 6 JP-A-2-258818
- Patent Document 7 JP-A-11-35675
- Patent Document 8 JP-A-11-106578
- Patent Document 9 JP-A-9-221539
- Patent Document 10 Japanese Patent Application Publication No. 2002-503524
- Non-Patent Document 1 Masao Karaushi, "Material Development of Shape Memory Polymers", CMC, pp. 30-43, 1989
- Non-Patent Document 2 Engle et al., J. Macromol. Sci. Re. Macromol. Chem. Phys., Vol. C33, No. 3, 239-257, 1993
- Non-Patent Document 3 Yoshinori Nakane and Masahiro Ishidoya, Color Materials, Vol. 67, No. 12, 766-774, 1994
- Non-Patent Document 4 Yoshinori Nakane and Masahiro Ishidoya, Color Materials, Vol. 69, No. 11, 735-742, 1996
- an object of the present invention is to provide a molded article using a shape-memory resin that is re-moldable and has excellent shape recovery ability.
- the present inventor has found that a shape-memory resin having a thermoreversible cross-linking structure that is covalently cross-linked at a temperature equal to or higher than the Tg of a resin and that is cleaved at a molding temperature is an excellent material for electronic devices and the like. It has been found that it can be used for molded articles that require shape recovery force and re-formability.
- the present invention has a shape memory property in which the glass transition temperature (Tg) is in the range of 40 ° C. or more and 200 ° C. or less, and is covalently bonded by cooling and crosslinked by a thermoreversible reaction that is cleaved by heating. Fat, the thermoreversible reaction has a cleavage temperature (Td) of 50 ° C. or more and 300 ° C. or less, and Tg + 10 ° C. ⁇ Td.
- Tg glass transition temperature
- Td cleavage temperature
- the present invention relates to a shape-memory resin having Tg or more and less than Td.
- thermoreversible reaction is a reaction in which a bond is cleaved at a predetermined temperature and recombines when cooled.
- thermo-reversible cross-linking site becomes a stationary phase and the resin becomes a reversible phase, so that a shape memory property can be obtained.
- thermosetting type because of the covalent bridge, and has excellent shape recovery because the bond is broken by heating during molding and reforming to function as a thermoplastic type.
- the shape-memory resin of the present invention is a thermosetting resin at the time of shape memory and recovery, and thus has excellent shape recovery ability, while it becomes a thermoplastic at the time of molding and re-forming. It is a resin with excellent moldability and remoldability. Therefore, it is useful as a molded article of a member for electronic equipment used near room temperature.
- FIG. 1 is a conceptual diagram illustrating the principle of shape memory in a conventional shape memory resin.
- FIG. 2 is a conceptual diagram illustrating the principle of shape memory and reshaping in a conventional shape-memory resin having a thermoreversible crosslinked structure.
- FIG. 3 is a conceptual diagram illustrating the principle of shape memory and reshaping in the shape memory resin of the present invention.
- the shape-memory resin of the present invention When the shape-memory resin of the present invention is melted at a temperature not lower than the cleavage temperature (Td) of the thermoreversible cross-linking portion and formed into a predetermined shape, the stationary phase (thermo-reversible cross-linking portion) and the reversible phase (the resin portion : Hard) The initial state (original form) (FIG. 10A) is stored.
- the shape-memory resin of the present invention becomes thermoplastic at the time of molding, and thus has excellent moldability.
- the temperature at which only the reversible phase is softened without cleaving the thermoreversible cross-linking part of the stationary phase is performed by heating the reversible phase (soft ) (FIG. (B)), and can be deformed by applying an external force in this state (FIG. (C)).
- the deformed molded product is cooled below Tg, the reversible phase is completely solidified and fixed in the deformed state (Fig. (D)).
- the shape of the molded article deformed to an arbitrary shape is maintained in the deformed state by the reversible phase temporarily fixed. Therefore, when the temperature reaches a temperature at which only the reversible phase is softened by heating (Tg or more and less than Td), the resin exhibits a rubber-like property, becomes a stable state, and recovers its original shape (FIG. 2B). At this time, since the thermoreversible cross-linking part of the stationary phase is a covalent cross-link, it is possible to achieve excellent resilience. By further cooling to below Tg, the compact returns to the initial state of FIG.
- the crosslink is cleaved by heating at a temperature higher than the Td of the thermoreversible crosslinked portion, and the resin is brought into a molten state.
- FIG. 5E shows an example in which the thermoreversible cross-linking portion is cleaved into a resin portion and a cross-linking agent portion, but the resin portions can be directly cross-linked without using a cross-linking agent.
- a resin having a Tg in a range of not more than Td of the thermoreversible reaction to be introduced and not less than a temperature that can withstand the use of a molded article such as a member for electronic equipment is selected.
- the heat resistance temperature varies depending on the members used.
- the Tg of the resin is preferably 40 ° C or more and 200 ° C or less. If the Tg force is less than 0 ° C, the rigidity at room temperature is low, resulting in poor morphological stability. If the Tg force is higher than 200 ° C, the moldability and workability are poor, and a large amount of energy is required. Gender points are also disadvantaged.
- the Tg of the resin is preferably from 40 ° C to 100 ° C, and more preferably the Tg of the resin is from 40 ° C to 80 ° C.
- a dryer or hot water can be considered as a practical heating means. It is preferable because the temperature can be controlled relatively accurately within a temperature range of ° C or less. On the other hand, if the Tg is 10 ° C. or more, the heating method becomes inconvenient, which may result in poor practicality. If the product is to be worn or touched directly on the body, it is preferable to keep the temperature below 80 ° C to prevent burns.
- the crosslinks are cleaved before the resin is softened, so that it is not possible to achieve a shape memory excellent in shape memory.
- a resin having a Tg of at least 10 ° C. lower than the Td of the thermoreversible reaction to be introduced is preferred.
- the bond cleavage temperature (Td) of the thermoreversible reaction used for the crosslinking site is in the range of 50 ° C or more and 300 ° C or less. In the practical temperature range, unless the stationary phase and the reversible phase are in a hardened state, the mechanical properties usable for electronic device members cannot be obtained. Therefore, if Td is less than 50 ° C., it is difficult to apply the problem to heat-resistant materials for electronic device members. If Td exceeds 300 ° C, it is not appropriate because thermal decomposition of resin and work problems will occur.
- Td is made equal to or higher than Tg of the resin + 10 ° C.
- heating is performed at a temperature of Tg or more to soften the reversible phase and deform the resin.However, if the stationary phase is not cross-linked at this temperature, the flow of the resin cannot be prevented, so the shape is memorized.
- Td is desirably Tg + 20 ° C or higher in order to widen the temperature range where deformation is possible. More preferably, Td is Tg + 30 ° C. or more.
- the temperature at the time of shape deformation and at the time of recovery is in the range of Tg or more and less than Td. Below Tg, the molecular motion of the resin does not occur, so shape memory and recovery cannot be achieved. On the other hand, above Td, bond cleavage of the thermoreversible reaction occurs, so that the flow of the resin cannot be prevented, and the memory given beforehand is lost.
- the temperature at the time of reshaping is set to a range of Td or higher.
- the temperature is not lower than Td and lower than the thermal decomposition start temperature of the resin. Above Td, bond reversal of the thermoreversible reaction occurs, and the moldability of the resin is improved.
- Tt indicates a deformation temperature
- Tf indicates a forming and reforming temperature
- Tdec indicates a decomposition temperature of resin.
- the thermoreversible reaction may include two or more types of reactions that can achieve excellent shape memory and recyclability if they include one type of reaction. .
- Tdl the highest temperature Td
- Td2 the lowest temperature Td
- thermoreversible cross-linking reactions are Diels-Alder type, nitroso dimer type, acid anhydride ester type, urethane type, azlatataton-hydroxyaryl type and carboxyl-alkoxy type. Is one or more types selected from the group consisting of
- the functional group required for the covalent thermoreversible reaction may be introduced into the molecular chain terminal of the resin material (precursor) to be subjected to thermoreversible crosslinking, or may be introduced into the molecular chain. Further, as a method of introduction, an addition reaction, a condensation reaction, a copolymerization reaction, or the like can be used.
- a functional group into a molecular chain various methods for introducing a functional group such as carboxylic acid nitridation and nitration of polystyrene are known. Also known is a polystyrene halogen halide, utilizing various chemical reactions of the halogen group, such as conversion to an amine group, It is also possible to introduce necessary functional groups (Reference: Polymer synthesis' reaction (3) p. 13—Kyoritsu Shuppan Co., Ltd.).
- Resins having a functional group in the main chain can also be used.
- a method for introducing a functional group such as esterification and etherification of a polymer having a hydroxyl group such as polyvinyl alcohol is known.
- a resin having a carboxylic acid group such as polymethacrylic acid can undergo various carboxyl group chemical reactions such as esterification. Further, it is also effective to copolymerize these resins with no functional group.
- a functional group can be introduced using a terminal blocking agent during polymerization.
- a terminal blocking agent for example, since the terminal of a living polymer such as styrene is a highly reactive carbo-one, it reacts almost quantitatively with carbon dioxide, ethylene oxide, a halogenated alkyl derivative having a functional group protected by a protecting group, and the like.
- esterification reaction it is effective to introduce a functional group into a polyester resin such as polycarbonate or polylactic acid by an esterification reaction.
- the esterification reaction can be carried out using a reagent such as a carbodiimide in addition to an acid or an alkali.
- a reagent such as a carbodiimide
- the molar ratio of diol Z dicarbonic acid used as a raw material to be used is made more than 1 to reduce the molecular chain terminal groups. It is possible to make it a hydroxyl group.
- the terminal can be converted into a hydroxyl group by a transesterification reaction. That is, by subjecting the polyester resin to ester exchange using a compound having two or more hydroxyl groups, a polyester resin having a terminal S hydroxyl group can be obtained.
- a compound having three or more hydroxyl groups as the compound having a hydroxyl group since a cross-linking point of a three-dimensional cross-linked structure can be formed.
- a cross-linking point of a three-dimensional cross-linked structure can be formed.
- Examples of the compound having two or more hydroxyl groups include divalent compounds such as ethylene glycol, propylene glycol, dipropylene glycol, 1,3- and 1,4-butanediol, and 1,6-monohexanediol.
- Trihydric alcohols such as alcohol, glycerin, trimethylolpropane, trimethylolethane, and hexanetriol; tetrahydric alcohols such as pentaerythritol, methylglycoside, and diglycerin; polyglycerin such as triglycerin and tetraglycerin; dipentaerythritol; tripenta Examples thereof include polypentaerythritol such as erythritol, cycloalkane polyol such as tetrakis (hydroxymethyl) cyclohexanol, and polybutyl alcohol.
- sugar alcohols such as adtol, arabitol, xylitol, sorbitol, man-tol, iditol, talitol, and dulcitol, gnorecose, mannose gnoreose, mannose, fructose, sonorebose, sucrose, ratatose, raffinose, and cellulose And the like.
- polyvalent phenols include monocyclic polyvalent phenols such as pyrogallol, hydroquinone, and phloroglucin; bisphenols such as bisphenol A and bisphenol sulfone; and condensates of phenol and formaldehyde (novolak).
- the compound can be modified into a carboxyl group by bonding a compound having a carboxylic acid having two or more functional groups to the hydroxyl group by the above-mentioned esterification reaction.
- a precursor having a carboxyl group can be easily prepared.
- the acid anhydride pyromellitic anhydride, trimellitic anhydride, phthalic anhydride, hexahydrophthalic anhydride, maleic anhydride and derivatives thereof can be used.
- the crosslinking site is cleaved by heating and covalently bonded by cooling. Consists of a second functional group. When solidifying at a lower temperature than the melt processing temperature, the first functional group and the second functional group form a cross-link by a covalent bond. And to the second functional group. The binding reaction and cleavage reaction at the cross-linking site proceed reversibly due to a change in temperature.
- the first functional group and the second functional group may be different functional groups or the same functional group. When two identical functional groups are symmetrically linked to form a crosslink, the same functional group can be used as the first functional group and the second functional group.
- a shape-memory resin crosslinked by a thermoreversible reaction is obtained.
- the co-gen include, for example, a furan ring, a thiophene ring, a pyrrole ring, a cyclopentadiene ring, 1,3-butadiene, a thiophene-1 oxide ring, a thiophene-1,1 dioxide ring, a cyclopenter 2,4-genone ring, and a 2H pyran ring.
- Ring, cyclohexa-1,3-diene ring, 2H pyran monooxide ring, 1,2-dihydropyridine ring, 2H thiopyran-1,1 dioxide ring, cyclohexa-2,4-genone ring, pyran dione ring And their substituents are used as functional groups.
- an unsaturated compound which additionally reacts with a conjugated diene to give a cyclic conjugate is used.
- a vinyl group, an acetylene group, an aryl group, a diazo group, a nitro group, a substituted product thereof, or the like is used as a functional group.
- the conjugated gen may also act as a dienophile.
- cyclopentadiene can be used for the crosslinking reaction, and Td is 150 ° C or more and 250 ° C or less.
- Dicyclopentadiene has both conjugated and dienophile effects.
- Dicyclopentadiene dicarboxylic acid which is a dimer of cyclopentadiene carboxylic acid, can easily obtain the cyclopentadenyl sodium power (see E. Rukcenstein et al., J. Polym. Sci. Part A: Polym. Chem., Vol. 38, 818-825, 2000).
- This dicyclopentadiene dicarboxylic acid is introduced as a cross-linking site into a site where a hydroxyl group is present by a transesterification reaction into a precursor having a hydroxyl group, a precursor modified with a hydroxyl group, and the like.
- a catalyst such as a carbodiimide may be used in addition to an acid and an alkali. It is also possible to conduct esterification by deriving the carboxyl group into an acid chloride using a salt or a chloride, and then reacting with the hydroxyl group. When an acid salt is used, it can easily react with an amino group and can be introduced into the amino group of amino acids and derivatives thereof.
- the maleimide derivative that is a dienophile can also synthesize a polyamine having at least two or more amino groups in one molecule.
- a polyamine having at least two or more amino groups in one molecule For example, trimethylenediamine, tetramethylenediamine, hexamethylenediamine, xylylenediamine, 3,9-bis (3-aminopropynole) -2,4,8,10-tetraoxaspiro [5.5]
- Aliphatic amines such as decane, bis (4-aminocyclohexyl) methane, tris (2-aminoethyl) amine, m-phenylenediamine, P-phenylenediamine, 4,4'-diaminodiphenylmethane, 4,4 'Diaminodiphenylsulfone, 4,4, diaminodiphenylether, 4,4, diaminodiphenylsulfide, 3,3, -di
- a dimer of 4,12-troso-3,5-benzylic acid discloses 4-toso-3,5-dicro-mouth benzoyl chloride A method for synthesizing a dimer is described.) And reacts with a hydroxyl group of a precursor having a hydroxyl group, a hydroxyl group of a precursor modified with a hydroxyl group, and the like, to thereby obtain a hydroxyl group.
- a thermoreversible cross-linking site can be easily introduced into the existing site.
- an acid chloride it also easily reacts with the amino group, so that it is introduced into the amino group side of amino acids and derivatives thereof. it can.
- Acid anhydrides and hydroxyl groups can be used in the crosslinking reaction.
- the acid anhydride an aliphatic carboxylic anhydride, an aromatic carboxylic anhydride or the like is used.
- any of a cyclic anhydride group and a non-cyclic anhydride group can be used, but a cyclic acid anhydride group is preferably used.
- the cyclic acid anhydride group include a maleic anhydride group, a phthalic anhydride group, a succinic anhydride group, and a dartaric anhydride group.
- the non-cyclic acid anhydride group include an acetic anhydride group and a propionic anhydride group. And a benzoic anhydride group.
- maleic anhydride group phthalic anhydride group, succinic anhydride group, glutaric anhydride group, pyromellitic anhydride group, trimellitic anhydride group, hexahydrophthalic anhydride group, acetic anhydride group, propionic anhydride Groups, benzoic anhydride groups and their substituted products are preferred as acid anhydrides which react with hydroxyl groups to form a bridged structure.
- hydroxyl group a hydroxyl group of a precursor having a hydroxyl group or a hydroxyl group of a precursor into which a hydroxyl group is introduced by various reactions is used.
- hydroxy conjugates such as joles and polyols may be used as the crosslinking agent.
- diamines and polyamines can be used as crosslinking agents.
- an acid anhydride having two or more acid anhydrides, such as pyromellitic anhydride is used as a crosslinking agent for a precursor having a hydroxyl group or a precursor modified with a hydroxyl group, for example. Can be used.
- a compound having two or more maleic anhydrides can be easily obtained by copolymerizing maleic anhydride with an unsaturated compound by vinyl polymerization (refer to Japanese Patent Application Laid-Open No. H11-106657 (Patent Document 8). ), JP-A-2000-34376). It can also be used as a crosslinking agent for precursors with hydroxyl groups, precursors modified with hydroxyl groups, etc.
- the acid anhydride and the hydroxyl group as described above form a thermoreversible crosslinked structure as shown by the following general reaction formula (III). In the general reaction formula (III), the acid anhydride group and the hydroxyl group form an ester to form a crosslink upon cooling. The Td of this crosslink is 260 ° C.
- thermoreversible crosslinking site can be formed from isocyanate and active hydrogen.
- a polyvalent isocyanate is used as a crosslinking agent to react with a hydroxyl group, an amino group, or a phenolic hydroxyl group of a precursor or a derivative thereof.
- a molecule having two or more functional groups selected from a hydroxyl group, an amino group and a phenolic hydroxyl group can be added as a crosslinking agent.
- a catalyst can be added to keep the cleavage temperature in a desired range.
- dihydroxybenzene, dihydroxybiphenyl, phenol resin, and the like are used as a cross-linking agent to avoid caro.
- a polyvalent isocyanate is used as a cross-linking agent, and is reacted with a hydroxyl group, an amino group, and a phenolic hydroxyl group of a precursor and a derivative thereof.
- Dihydroxybenzene, dihydroxybiphenyl, phenol resin or the like can be used as a crosslinking agent.
- polyvalent isocyanates include tolylene diisocyanate (TDI) and polymers thereof, 4,4-diphenylmethane isocyanate (MDI), hexamethylene diisocyanate (HMDI), 1,4 Phenylene diisocyanate (DPDI), 1,3 Phenylene diisocyanate, xylylene diisocyanate, lysine diisocyanate, 1 methylbenzene 2,4,6-triisocyanate, naphthalene-1 , 3,7-triisocyanate, biphenyl-1,4,4'-triisocyanate, trifluoromethane 4,4,4 "triisocyanate, tolylene diisocyanate, lysine triisocyanate Etc. can be used.
- MDI 4,4-diphenylmethane isocyanate
- HMDI hexamethylene diisocyanate
- DPDI 1,4 Phenylene diisocyanate
- 1,3 diacetoxytetrabutyldistannoxane or the like is used.
- Organic compounds, amines, metal stones, etc. may be used as cleavage catalysts.
- thermo-irreversible crosslinked structure as shown in the following general reaction formula (IV).
- the phenolic hydroxyl group and the isocyanate group form urethane and are crosslinked by cooling.
- the Td of this crosslink is between 120 ° C and 250 ° C and can be adjusted by the catalyst.
- the aryl group includes a fluor group, a tolyl group, a xylyl group, a biphenyl group, a naphthyl group, an anthryl group, a phenanthryl group and a group derived from these groups, and a phenolic group bonded to these groups. Reacts with the azlatatatone structure contained in the group forming the crosslinked structure.
- a compound having a phenolic hydroxyl group a precursor having a phenolic hydroxyl group, a precursor modified with hydroxylphenols, or the like is used.
- the azlatataton structure includes 1,4 (4,4'-dimethylazlactyl) butane, poly (2-vinyl 4,4'dimethylazaratatatone), bisazlatatatonebenzene, and bisazlatatatone. Sun and other polyvalent azratatanes are preferred.
- thermoreversible crosslinked structure as shown in the following general reaction formula (V).
- the azlatatatone group and the phenolic hydroxyl group form a covalent bond upon cooling to form a crosslink.
- the Td of this crosslink is between 100 ° C and 200 ° C.
- a precursor having a carboxyl group As a compound having a carboxyl group, a precursor having a carboxyl group, a precursor modified with a carboxyl group, or the like is used.
- the alkenyl-oxy structure examples include butyl ether, allyl ether and structures derived from these structures, and those having two or more alkenyloxy structures can also be used.
- Alkyl ether derivatives such as bis [4 (bi-xoxy) butyl] adipate and bis [4 (bi-xoxy) butyl] succinate can also be used as the crosslinking agent.
- thermoreversible crosslinked structure as shown in the following general reaction formula (VI).
- the carboxyl group and the vinyl ether group form a hemiacetal ester upon cooling to form a crosslink (see: JP-A-11 35675 (Patent Document 7), 179479).
- the Td of this crosslink is 100 ° C or more and 250 ° C or less, and can be adjusted by the crosslink structure.
- a compound having two or more functional groups capable of forming a thermoreversible crosslinking site in a molecule can be a crosslinking agent.
- crosslinking agent having an acid anhydride group examples include bisphthalic anhydride conjugate, bissuccinic anhydride compound, bisdaltaric anhydride compound, bismaleic anhydride compound and substituted products thereof. Can be
- Examples of the crosslinking agent having a hydroxyl group include ethylene glycol, propylene glycol, dipropylene glycol, 1,3- and 1,4-butanediol, and 1,6-xandiol.
- Trihydric alcohols such as glycerin, trimethylolpropane, trimethylolethane, and hexanetriol; tetrahydric alcohols such as pentaerythritol, methyldaricoside, and diglycerin; polyglycerins such as triglycerin and tetraglycerin; Examples thereof include polypentaerythritol such as dipentaerythritol and tripentaerythritol, cycloalkane polyol such as tetrakis (hydroxymethyl) cyclohexanol, and polybutyl alcohol.
- sugars such as mannitol, iditol, talitol and dulcitol, sugars such as darcos, mannose gnorecose, mannose, fructose, sonorebose, sucrose, ratatose, raffinose and cellulose.
- crosslinking agent having a carboxyl group examples include oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, phthalic acid, maleic acid, and fumaric acid.
- crosslinking agent having a butyl ether group examples include bis [4- (bi-xoxy) butyl] adipate, bis [4 (bi-xoxy) butyl] succinate, ethylene glycol dibutyl ether, and butanediol.
- crosslinking agent having a phenolic hydroxyl group examples include monocyclic polyvalent phenols such as dihydroxybenzene, pyrogallol, and phloroglucin, dihydroxybiphenol, bisphenol A, bisphenols such as bisphenolsulfone, and resole Phenolic resin and novolak phenolic resin.
- Examples of the crosslinking agent having an isocyanate group include bifunctional isocyanates, such as 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, and 2 Alicyclic ring such as aromatic diisocyanate such as, 4, diphenyl-norethanemethane diisocyanate, p-phenylene diisocyanate, aliphatic diisocyanate such as hexamethylene diisocyanate and lysine diisocyanate, and isophorone diisocyanate
- Examples include aryl aryl diisocyanates such as the formula diisocyanate and xylylene diisocyanate.
- trifunctional isocyanates examples include 1-methylbenzene 2,4,6-triisocyanate, naphthalene-1,3,7-triisocyanate, biphenyl-1,4,4'-triisosinate, Triphene-norethane-4,4,4,4 "-triisocyanate, tolylene diisocyanate , Lysine triisocyanate and the like.
- Examples of the crosslinking agent having an azlatatatone group include bisazlatatone butane, bisazlatatone benzene, and bisazlatatone hexane.
- Examples of the crosslinking agent having a nitroso group include dinitrosopropane, dinitrosohexane, dinitrosobenzene, and dinitrosotoluene.
- the reversible reaction forms a cross-linking site by binding upon cooling to form a cross-linking site, and is cleaved by heating.
- Diels-Alder type, nitroso dimer type, acid anhydride ester type, urethane type, and azurata Toluene-hydroxyaryl type and carboxyl-alkoxy type can be used.
- polyester resins such as polylactic acid and polycarbonate are hydrolyzed by a carboxylic acid, so that acid anhydride ester type crosslinking is suitable.
- Resins having a large number of hydroxyl groups such as polyvinyl alcohol, are not suitable because they cause a curing reaction with urethane type, azlatatatone-hydroxyaryl type and carboxyl-alkoxy type.
- the Diels-Alder type can be applied to various resins because it is hydrophobic and can be applied to hydrolyzed resin, and the reactive groups are not deactivated by moisture or the like. It can also be suitably used for vegetable-derived fats having many ester bonds.
- a resin having a Tg in the range of 40 ° C ⁇ Tg ⁇ 200 ° C can be used.
- polycarbonate, polymethyl methacrylate, polyethyl methacrylate, polystyrene, polyacrylic acid, polyacrylonitrile, polybutyl alcohol, polychlorinated butyl, polybutylpyrrolidone, 6-nylon, 6,6-nylon, polyethylene Telephthalate, polyurethane, triacetyl cellulose, tritrocellulose, polylactic acid and the like can be used. These can be used alone or in combination of two or more.
- a biodegradable crosslinked product can be obtained by using a biodegradable resin such as triacetyl cellulose, tritrocellulose, and polylactic acid.
- Environmentally friendly And a plant-derived resin such as polylactic acid.
- the Tg can be adjusted by copolymerization or blending with a resin having a high Tg. Further, even when the Tg is high or a resin is used, the Tg can be adjusted by adding a plasticizer.
- Tg can be adjusted by the crosslinked structure of the resin. For example, reducing the molecular weight of the precursor or increasing the number of functional groups in the precursor can increase the crosslink density and increase the Tg of the resin. Increasing the molecular weight of the precursor or reducing the number of functional groups in the precursor can lower the crosslink density and lower the Tg of the resin.
- the Tg of the crosslinked product can be adjusted to 40 ° C or more and 200 ° C or less.
- the Tg is preferably 40 ° C or higher and 100 ° C or lower, more preferably 80 ° C or lower.
- the number average molecular weight (hereinafter abbreviated as molecular weight) of the above precursor is used in the range of 100-1,000,000. Preferable ⁇ Puma, 1,000 to 100,000, and ⁇ Preferred ⁇ Puma 2,000-50,000. If the molecular weight of the precursor is less than 100, the mechanical properties and workability of the resin may be poor. On the other hand, if it exceeds 1,000,000, the crosslink density becomes low, so that the shape memory may be poor.
- a three-dimensional crosslinked structure is preferable as the crosslinked structure.
- the crosslinking density of the three-dimensional crosslinking structure is set to a desired value by setting the number of functional groups of the resin material, the mixing ratio of each member, and the like to predetermined values.
- the crosslink density of the three-dimensional crosslinked structure is represented by the number of moles of the three-dimensional crosslinked point contained per 1 OOg of the resin. That is, (number of functional groups 2) in one molecule of the raw material was defined as the number of moles of the crosslinking point of the molecule.
- the crosslink density is preferably 0.0001 or more, more preferably 0.001 or more.
- the crosslinking density is preferably 1 or less, and particularly preferably 0.3 or less. If the crosslink density is less than 0.0001, the network structure is not formed, and the shape may be recovered. On the other hand, if it is larger than 1, Tg or more will not exhibit sufficient rubber-like properties and will not be deformed, so that it may not function as a shape memory resin.
- the ratio (G, ⁇ Tg ⁇ / C ⁇ Tg + 20.C ⁇ ) of the storage rigidity G '(Pa) at temperatures above and below Tg is 1. ( ⁇ ! ⁇ Or more. 0 X 10 7 the range, preferably 2. ( ⁇ ! ⁇ or E. 0 X 10 5 following ranges some crosslinking was used.
- G ' is a micro-Brownian motion at temperatures above Tg Because of the lower entropy elasticity and the higher energy below Tg due to energy elasticity, the ratio of G 'at temperatures above and below Tg is an indicator of the ease of deformation. The ratio is 1. OX In 10 less than 1 Ri that "the deformation will not show any sufficient rubber in a temperature range above Tg, 1. no longer form OX 10 7 larger than network structure, shape memory is lost Is
- the shape memory resin of the present invention may be obtained within a range that does not impair desired properties.
- Inorganic fillers organic fillers, reinforcing materials, colorants, stabilizers (radical scavengers, antioxidants, etc.), antibacterial agents, fungicides, flame retardants, etc. can be used in combination as needed.
- silica, alumina, talc, sand, clay, slag and the like can be used as the inorganic filler.
- Organic fibers such as polyamide fibers and vegetable fibers can be used as the organic filler.
- As the reinforcing material glass fiber, carbon fiber, polyamide fiber, polyarylate fiber, needle-like inorganic substance, fibrous fluorine resin, and the like can be used.
- the antibacterial agent silver ions, copper ions, zeolites containing these, and the like can be used.
- a silicone flame retardant, a bromine flame retardant, a phosphorus flame retardant, an inorganic flame retardant and the like can be used.
- the resin and the resin composition as described above can be formed into a housing of an electric appliance by a general thermoplastic resin molding method such as an injection molding method, a film molding method, a blow molding method, and a foam molding method. It can be processed into various molded products such as electric and electronic devices.
- a general thermoplastic resin molding method such as an injection molding method, a film molding method, a blow molding method, and a foam molding method. It can be processed into various molded products such as electric and electronic devices.
- Shape memory A film of 2 cm x 5 cm x 1.8 mm was prepared, this film was heated at Tg + 20 ° C, the center of the film was bent at 90 °, deformed for 5 seconds, and then cooled to room temperature. . At this time, the deformability of the film was evaluated by the angle (Al). 80 ° ⁇ A1 ⁇ 90 °, 70 ° ⁇ A1 ⁇ 80 °. X is ⁇ A1 ⁇ 70 °. The deformed film was heated again at Tg + 20 ° C. for 10 seconds, and the recoverability was evaluated in terms of angle (A2). 0 ° ⁇ A2 ⁇ 10 ° ⁇ , 10. Al ⁇ 20 ° is ⁇ , and 20 ° ⁇ 2 ⁇ 90 ° is X.
- Reformability The above film was melted at 200 ° C and reshaped into a circle having a radius of 1.8 cm. The reformed film was evaluated for deformability (A3) and recoverability (A4) as described above.
- polylactic acid as a precursor are shown below. Since polylactic acid has biodegradability and is a plant-derived material, it is a preferable material in terms of environmental issues. The following materials were designed to give polylactic acid excellent shape memory and recyclability. First, since polylactic acid thermally decomposes at 200 ° C or higher, a reversible bridge site with a dissociation temperature (Td) of 50 ° C to 200 ° C was selected. As this reversible reaction, Diels-Alder type, carboxyl-alkoxy type, urethane type and the like can be used. Next, a reversible cross-linking site was introduced into polylactic acid to effect three-dimensional cross-linking. At this time, the Tg of the resin was adjusted to be 40 ° C or more and 100 ° C or less. Finally, the shape memory and recyclability of the crosslinked resin were verified.
- Td dissociation temperature
- the dissociation temperature of the furan-maleimide bond is 80 ° C. or 140 ° C. described in the literature (Non-patent Document 2) .As shown in the following examples, the dissociation temperature is 150 ° C. Suitable crosslinking sites for lactic acid based resins.
- crosslinked product [R12] was melted at 160 ° C and then crosslinked at 100 ° C for 1 hour to produce a film for shape memory evaluation.
- Table 1 shows the evaluation results.
- Example 16 is a shape-memory resin having excellent shape-recovering power and re-moldability.
- the polylactic acid-based resin having excellent biodegradability is used as a basic unit, and the shape-memory resin has excellent biodegradability.
- the Tg of Example 16 could be adjusted to a practical range of 40 ° C or more and 100 ° C or less. Increasing the crosslink density also increased the Tg of the resin (Examples 2-4). The Tg could also be increased by increasing the number of functional groups in the precursor.
- Comparative Example 1 the storage rigidity ratio was small V, so that it could not be deformed and crosslinked, and the shape recovery power was inferior.
- VEctomer 5015 (trade name, manufactured by Aldrich) 0.42 g was weighed, melt-mixed at 180 ° C for 10 minutes, and crosslinked at 100 ° C for 2 hours to obtain a cross-linked carboxyl-butyl ether polylactic acid [R18]. . Tg was 52 ° C and Td was 180 ° C. The crosslink density was 0.00358.
- this crosslinked product [R22] was melted at 190 ° C, and then crosslinked at 100 ° C for 2 hours to produce a film for shape memory evaluation.
- Table 2 shows the evaluation results.
- Examples 7-9 are shape-memory resins that have excellent shape-recovering power and can be remolded.
- the polylactic acid-based resin having excellent biodegradability is used as a basic unit, and the shape-memory resin has excellent biodegradability.
- Example 7-9 Tg could be adjusted to a practical range from 40 ° C to 100 ° C.
- increasing the crosslink density also increased the Tg of the resin.
- polycarbonate manufactured by Sumitomo Dow
- lOOOOg was impregnated with 2 L of a weakly alkaline (pHIO-12) aqueous ammonia solution for 4 hours, and then the aqueous solution was removed.
- This polycarbonate was melt-mixed at 280 ° C. to obtain a low-molecular-weight polycarbonate resin [R27] (molecular weight: 2000).
- R27 molecular weight: 2000
- 100 g of this polycarbonate [R27] and 21.5 g of 1-methylbenzene 2,4,6-triisocyanate were weighed, melt-mixed at 180 ° C for 5 minutes, and crosslinked at 100 ° C for 2 hours to obtain a polycarbonate. (R28) was obtained.
- Tg was 150 ° C and Td was 185 ° C.
- the crosslink density was 0.00311.
- Example 1 produced in Example 1 was weighed 20.lg and 4.17 g of tolylene diisocyanate (TDI), and heated at 100 ° C for 1 hour and at 160 ° C for 1 hour to obtain polylactic acid.
- Irreversible urethane bridge [R29] A film that is also strong. Tg was 70 ° C.
- thermoplastic shape memory resin (“Diaplex” (trade name), manufactured by Mitsubishi Heavy Industries, Ltd.) was melted at 200 ° C. to produce a film for evaluation.
- thermosetting resin with shape-memory properties (“Kuraprene HM Sheet” (trade name), manufactured by Kuraray Co., Ltd.) ) was used to produce a film for evaluation.
- Examples 10 and 11 are shape-memory resins that have excellent shape-recovering power and can be remolded.
- Comparative Examples 2 and 5 were thermosetting resins and could not be remolded.
- the crosslinks were dissociated in a deformable temperature range of Tg or more, so that a force showing no shape memory was exerted.
- Comparative Example 4 was inferior in shape recovery because it was a thermoplastic resin.
- the product of the present invention having such excellent shape memory properties can be used for various molded articles such as electronic device members.
- electronic device members For example, exterior materials for electronic devices (PCs, mobile phones, etc.), screws, fastening pins, switches, sensors, information recording devices, rollers and belts for OA devices, packaging materials for sockets, pallets, etc., air conditioning and air conditioning It can be used for on-off valves and heat shrink tubing of machines.
- the present invention can be applied to various fields as automobile parts such as bumpers, handles, rearview mirrors, and household parts such as casts, toys, glasses frames, orthodontic wires, bedsore prevention beddings, and the like.
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Abstract
Description
Claims
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US10/582,675 US7723460B2 (en) | 2003-12-12 | 2004-12-10 | Shape-memory resin performing remoldability and excellent in shape recovering property, and molded product composed of the cross-linked resin |
JP2005516192A JP5040112B2 (ja) | 2003-12-12 | 2004-12-10 | 再成形可能かつ形状回復能に優れた形状記憶性樹脂および該樹脂の架橋物からなる成形体 |
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Also Published As
Publication number | Publication date |
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CN100432123C (zh) | 2008-11-12 |
JP5040112B2 (ja) | 2012-10-03 |
US7723460B2 (en) | 2010-05-25 |
CN1894313A (zh) | 2007-01-10 |
US20070148465A1 (en) | 2007-06-28 |
JPWO2005056642A1 (ja) | 2007-07-05 |
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