CN102020746A - Application of epoxy functionalized acrylic ester polymer - Google Patents
Application of epoxy functionalized acrylic ester polymer Download PDFInfo
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- CN102020746A CN102020746A CN 201010535856 CN201010535856A CN102020746A CN 102020746 A CN102020746 A CN 102020746A CN 201010535856 CN201010535856 CN 201010535856 CN 201010535856 A CN201010535856 A CN 201010535856A CN 102020746 A CN102020746 A CN 102020746A
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Abstract
The invention relates to application of an epoxy functionalized acrylic ester polymer. The acrylic ester polymer is used for a polylactic-acid modified chain extender, has little toxicity without volatility, contains a plurality of epoxy functional groups, and can chemically react with polylactic acid molecular chains in melt blending with polylactic acid and connect two or more than two polylactic acid molecular chains through a chemical bond to greatly improve the molecular weight of the polylactic acid, and the compatibility between the polylactic acid and the acrylic ester polymer is enhanced because of the chemical reaction between the polylactic acid and the acrylic polymer. The modified polylactic acid has the weight-average molecular weight from 367,000 to 505,000, the vitrification conversion temperature from 64.2 DEG C to 66.4 DEG C and the balance torque value from 5.1 N*m to 9.8 N*m and is suitable for subsequent processing.
Description
Technical field
The present invention relates to a kind of application of epoxy-functional acrylic polymer.
Background technology
Poly(lactic acid) (PLA) is a kind of nontoxic, nonirritant, has the macromolecular material of good biodegradability properties and biocompatibility.It owing to the degraded of hydrolysis or microorganism, finally can be decomposed into carbonic acid gas and water in physical environment.And its raw material can be the environmental protection plastics of recyclable regenerative by fermentative preparation such as starch.But poly(lactic acid) matter is crisp, shock resistance is poor, so need carry out modification to poly(lactic acid) when some is used.Particularly the relative molecular weight of the poly(lactic acid) that obtains of direct polycondensation method is very low, so the method for carrying out chain extension by chemical reaction in the course of processing is widely adopted.
(Polym Bull, 1995 such as Woo.VOL.35, NO.4 P415) has reported the chain extension method of vulcabond at first, the relative molecular weight that will obtain through melt phase polycondensation is 11, the oligopolymer of 000 poly(lactic acid) and hexamethylene diisocyanate carry out chain extension, make the matter average molecular weight of poly(lactic acid) reach 76,000.
Adopt chain extension modification method among the patent CN101302284A, disclose and chosen bifunctional isocyanic ester, poly-dihydric alcohol and isocyanic ester encapsulant, the preparation enclosed type isocyanate prepolymer, and the reaction of using it for polycondensation PLA prepolymer extrudes chain extension, prepared high-molecular weight PLA..Yet isocyanic ester is very big to the harm of human body, and contaminate environment.
Bikiaris (Polymer Chemistry, 1996,34 (7): 1337-1342) wait and to use voluntarily that several 2-glycidyl ester cpds that contain imide ring of synthetic carry out chain extension to PET, PBT, this chainextender has good thermostability, but the preparation route is long, is not easy to obtain.
A kind of epoxy-functional acrylic polymer is used for polylactic acid modified and chain extension does not appear in the newspapers as yet.
Summary of the invention
In order to overcome the deficiency of prior art, the invention provides a kind of application of epoxy-functional acrylic polymer.Contain plural epoxy-functional in the described epoxy-functional acrylic polymer, when carrying out blend, can the molecular weight of poly(lactic acid) be increased substantially with polylactic acid molecule generation chemical reaction with poly(lactic acid), simultaneously because the chemical reaction between poly(lactic acid) and acrylic polymers, increase the consistency of poly(lactic acid) and acrylic polymer, played the purpose of chain extension and modification simultaneously.
The invention provides a kind of application of epoxy-functional acrylic polymer, it is as poly(lactic acid) chain extension properties-correcting agent.
A kind of epoxy-functional acrylic polymer is as follows as the usage of poly(lactic acid) chain extension properties-correcting agent:
Mass percent in the blend total amount is respectively 3～15% according to epoxy-functional acrylic polymer and polylactic resin: 85～97%, the blend in the Haake torque rheometer with polylactic resin and epoxy-functional acrylic polymer, temperature is under 180 ℃ of conditions, rotating speed is 60r/min, the blend time is 10min minute, obtains the poly(lactic acid) of chain extension modification.
In the blend process, the change in torque situation of record rheometer, record reaches the balancing torque of the blend time of 10min; With the tetrahydrofuran (THF) is moving phase, is reference with the polystyrene, the weight-average molecular weight of the poly(lactic acid) after employing gel permeation chromatography (GPC) test poly(lactic acid) and the modification; The second-order transition temperature of the poly(lactic acid) after employing scanning differential calorimeter (DSC) test poly(lactic acid) and the modification.See embodiment for details.
A kind of epoxy-functional acrylic polymer is the random copolymers of polymethylmethacrylate and glycidyl methacrylate, and each molecular chain contains a plurality of epoxy-functionals, and its structural formula is as follows:
Wherein the span of m is 0-750, and the span of n is 0-750, and the span of x is 0-42, and the span of y is 0-42, and wherein m, n are not 0 simultaneously, and x, y are not 0 simultaneously;
A kind of preparation method of epoxy-functional acrylic polymer is as follows:
A kind of weight part prescription of epoxy-functional acrylic polymer is:
Esters of acrylic acid main monomer 64.4-88.2;
Vinylformic acid glyceride type auxiliary monomer 1.4-7.2;
Can dissolve the solvent 10-30 of acrylic polymer; Esters of acrylic acid main monomer, vinylformic acid glyceride type auxiliary monomer and the solvent that can dissolve acrylic polymer are 100 weight parts altogether;
Initiator 0.04～0.16;
Molecular weight regulator 0.04～0.24;
A kind of weight part screening formulation of acrylic polymer is:
Esters of acrylic acid main monomer 73.6-78.4
Vinylformic acid glyceride type auxiliary monomer 1.6-6.4;
Can dissolve the solvent 20 of acrylic polymer;
Initiator 0.08;
Molecular weight regulator 0.12;
A kind of weight part of acrylic polymer is most preferably filled a prescription and is:
Esters of acrylic acid main monomer 76.8;
Vinylformic acid glyceride type auxiliary monomer 3.2;
Can dissolve the solvent 20 of acrylic polymer;
Initiator 0.08;
Molecular weight regulator 0.12;
Described acrylic ester monomer is methyl methacrylate, Jia Jibingxisuanyizhi, methyl acrylate or ethyl propenoate;
Described vinylformic acid glyceride type monomer is glycidyl methacrylate or glycidyl acrylate;
The described solvent that can dissolve acrylic polymer is toluene, ethylbenzene, tetrahydrofuran (THF), acetone or butanone;
Described initiator is a di-t-butyl peroxide;
Described molecular weight regulator is n-dodecyl mercaptan, uncle's lauryl mercaptan, normal-butyl mercaptan, isobutyl-mercaptan or tert-butyl mercaptan;
Adopt the continuous bulk polymerization method to carry out polymerization,, change successive polymerization gradually over to from batch polymerization process;
Batchwise polymerization: each feed composition is mixed according to prescription, adopt Mi Dunluo diaphragm type charge pump to add in the reactor, stir, stirring velocity 160r/min, adopt the air in nitrogen or the abundant replacement reaction kettle of other rare gas element, adopt the oil bath heat temperature raising, oil bath temperature is constant in 120 ℃, from oil bath heat up begin to react 3 hours after, obtain mixture;
Change successive polymerization over to: mixture is added in the reactor, and oil bath temperature is constant in 120 ℃; By the constant speed continuous charging,, press the identical speed continuous charging of continuous blowing more simultaneously by the continuous blowing of speed identical with feed rate, polymerization is carried out always, the polymkeric substance that obtains is through after removing volatilizable composition, and granulation obtains the target product of continuous bulk polymerization.
Beneficial effect: a kind of acrylic polymer of the present invention's preparation is used for polylactic acid modified chainextender.Described acrylic polymer is the little epoxy-functional acrylic acid esters co-polymer that contains a plurality of epoxy-functionals again of a kind of non-volatility, toxicity.Contain plural epoxy-functional in the acrylic polymer, when carrying out melt blending with poly(lactic acid), can with polylactic acid molecule chain generation chemical reaction, two or more polylactic acid molecule chains are connected by chemical bond, the molecular weight of poly(lactic acid) is increased substantially, owing to the chemical reaction between poly(lactic acid) and acrylic polymers, increased the consistency of poly(lactic acid) and acrylic polymer simultaneously.Having played simultaneously increases the polylactic acid molecule amount and makes poly(lactic acid) and the better purpose of the consistency of acrylic polymer, and this is that prior art is unexistent.
Pure polylactic resin weight-average molecular weight is 198,000, and the balancing torque value is 1.7Nm, and second-order transition temperature is 61.4 ℃.
In the synthesizing formula of epoxy-functional acrylic polymer: acrylic ester monomer is 64.4-88.2, vinylformic acid glyceride type auxiliary monomer is 1.4-7.2, the solvent that can dissolve acrylic polymer is 10-30, initiator is 0.04～0.16, and molecular weight regulator is 0.04～0.24 o'clock; Form the proportioning weight part when the blend of poly(lactic acid) and epoxy-functional acrylic polymer and be respectively 85-97, during 3-15, the weight-average molecular weight of the poly(lactic acid) after the modification is 367,000 to 505, between 000, second-order transition temperature is between 64.2 ℃ to 66.4 ℃, and the balancing torque value between the 9.8Nm, is suitable for following process at 5.1Nm.Wherein preferred embodiment is in the synthesizing formula of epoxy-functional acrylic polymer: the esters of acrylic acid main monomer is 76.8, vinylformic acid glyceride type auxiliary monomer is 3.2, the solvent that can dissolve acrylic polymer is 20, and initiator is 0.08, and molecular weight regulator is 0.12 o'clock; When the blend composition proportioning weight part of poly(lactic acid) and epoxy-functional acrylic polymer is respectively 85 and 15, the weight-average molecular weight of the poly(lactic acid) after the modification can reach 505,000, second-order transition temperature is elevated to 66.4 ℃, the balancing torque value is 9.8Nm, be suitable for following process, effect is the most obvious.
Embodiment
Embodiment 1
1) a kind of preparation of epoxy-functional acrylic polymer:
| Component | Weight part |
| Toluene | 30 |
| Methyl methacrylate | 64.4 |
| Glycidyl methacrylate | 5.6 |
| Di-t-butyl peroxide | 0.16 |
| N-dodecyl mercaptan | 0.04 |
Batchwise polymerization: each feed composition is mixed according to prescription, toluene 900 grams, methyl methacrylate 2032 grams, glycidyl methacrylate 168 grams, di-t-butyl peroxide 4.8 grams, n-dodecyl mercaptan 1.2 grams, mix in the reactor of 5 liters of back addings, adopt Mi Dunluo diaphragm type charge pump to add in the reactor, stir, stirring velocity 160r/min, adopt the air in nitrogen or the abundant replacement reaction kettle of other rare gas element, adopt the oil bath heat temperature raising, oil bath temperature is constant in 120 ℃, from oil bath heat up begin to react 3 hours after, obtain mixture;
Change successive polymerization over to: oil bath temperature is constant in 120 ℃, and viscosity is suitable in the still, begins to emit material by constant speed 24-26g/min, begins to add mixing raw material by constant speed 24-26g/min simultaneously, puts a still material in about 2 hours.The polymkeric substance that obtains behind the material more than the operation 5 still total amounts is through after removing volatilizable composition continuously, and granulation obtains subject polymer.
2) take by weighing 53.35g poly(lactic acid) and 1.65g epoxy-functional acrylic polymer melt blending in the Haake torque rheometer, temperature of reaction is 180 ℃, rotating speed 60r/min, mixing time 10min, the weight-average molecular weight that the poly(lactic acid) of the chain extension modification that obtains records, balancing torque value, second-order transition temperature are listed in the table 1.
Embodiment 2
1) a kind of preparation of epoxy-functional acrylic polymer:
| Component | Weight part |
| Toluene | 10 |
| Methyl methacrylate | 88.2 |
| Glycidyl methacrylate | 1.8 |
| Di-t-butyl peroxide | 0.04 |
| N-dodecyl mercaptan | 0.24 |
Polymerization process is with embodiment 1.
2) take by weighing 49.5g poly(lactic acid) and 5.5g epoxy-functional acrylic polymer melt blending in the Haake torque rheometer, temperature of reaction is 180 ℃, rotating speed 60r/min, mixing time 10min, the weight-average molecular weight that the poly(lactic acid) of the chain extension modification that obtains records, balancing torque value, second-order transition temperature are listed in the table 1.
Embodiment 3:
1) a kind of preparation of epoxy-functional acrylic polymer:
| Component | Weight part |
| Toluene | 30 |
| Methyl methacrylate | 68.6 |
| Glycidyl methacrylate | 1.4 |
| Di-t-butyl peroxide | 0.16 |
| N-dodecyl mercaptan | 0.04 |
Polymerization process is with embodiment 1.
2) take by weighing 48.4g poly(lactic acid) and 6.6g epoxy-functional acrylic polymer melt blending in the Haake torque rheometer, temperature of reaction is 180 ℃, rotating speed 60r/min, mixing time 10min, the weight-average molecular weight that the poly(lactic acid) of the chain extension modification that obtains records, balancing torque value, second-order transition temperature are listed in the table 1.
Embodiment 4:
1) a kind of preparation of epoxy-functional acrylic polymer:
| Component | Weight part |
| Toluene | 10 |
| Methyl methacrylate | 82.8 |
| Glycidyl methacrylate | 7.2 |
| Di-t-butyl peroxide | 0.04 |
| N-dodecyl mercaptan | 0.24 |
Polymerization process is with embodiment 1.
2) take by weighing 52.25g poly(lactic acid) and 2.75g epoxy-functional acrylic polymer melt blending in the Haake torque rheometer, temperature of reaction is 180 ℃, rotating speed 60r/min, mixing time 10min, the weight-average molecular weight that the poly(lactic acid) of the chain extension modification that obtains records, balancing torque value, second-order transition temperature are listed in the table 1.
Embodiment 5:
1) a kind of preparation of epoxy-functional acrylic polymer:
| Component | Weight part |
| Toluene | 20 |
| Methyl methacrylate | 73.6 |
| Glycidyl methacrylate | 6.4 |
| Di-t-butyl peroxide | 0.08 |
| N-dodecyl mercaptan | 0.12 |
Polymerization process is with embodiment 1.
2) take by weighing 50.6g poly(lactic acid) and 4.4g epoxy-functional acrylic polymer melt blending in the Haake torque rheometer, temperature of reaction is 180 ℃, rotating speed 60r/min, mixing time 10min, the weight-average molecular weight that the poly(lactic acid) of the chain extension modification that obtains records, balancing torque value, second-order transition temperature are listed in the table 1.
Embodiment 6:
1) a kind of preparation of epoxy-functional acrylic polymer:
| Component | Weight part |
| Toluene | 20 |
| Methyl methacrylate | 78.4 |
| Glycidyl methacrylate | 1.6 |
| Di-t-butyl peroxide | 0.08 |
| N-dodecyl mercaptan | 0.12 |
Polymerization process is with embodiment 1.
2) take by weighing 46.75g poly(lactic acid) and 8.25g epoxy-functional acrylic polymer melt blending in the Haake torque rheometer, temperature of reaction is 180 ℃, rotating speed 60r/min, mixing time 10min, the weight-average molecular weight that the poly(lactic acid) of the chain extension modification that obtains records, balancing torque value, second-order transition temperature are listed in the table 1.
Embodiment 7:
1) a kind of preparation of epoxy-functional acrylic polymer:
| Component | Weight part |
| Toluene | 20 |
| Methyl methacrylate | 76.8 |
| Glycidyl methacrylate | 3.2 |
| Di-t-butyl peroxide | 0.08 |
| N-dodecyl mercaptan | 0.12 |
Polymerization process is with embodiment 1.
2) take by weighing 46.75g poly(lactic acid) and 8.25g epoxy-functional acrylic polymer melt blending in the Haake torque rheometer, temperature of reaction is 180 ℃, rotating speed 60r/min, mixing time 10min, the weight-average molecular weight that the poly(lactic acid) of the chain extension modification that obtains records, balancing torque value, second-order transition temperature are listed in the table 1.
Embodiment 8:
1) a kind of preparation of epoxy-functional acrylic polymer:
| Component | Weight part |
| Ethylbenzene | 20 |
| Jia Jibingxisuanyizhi | 75.2 |
| Glycidyl acrylate | 4.8 |
| Di-t-butyl peroxide | 0.08 |
| Uncle's lauryl mercaptan | 0.12 |
Polymerization process is with embodiment 1.
2) take by weighing 51.7g poly(lactic acid) and 3.3g epoxy-functional acrylic polymer melt blending in the Haake torque rheometer, temperature of reaction is 180 ℃, rotating speed 60r/min, mixing time 10min, the weight-average molecular weight that the poly(lactic acid) of the chain extension modification that obtains records, balancing torque value, second-order transition temperature are listed in the table 1.
Embodiment 9:
1) a kind of preparation of epoxy-functional acrylic polymer:
| Component | Weight part |
| Acetone | 20 |
| Methyl acrylate | 74.4 |
| Glycidyl methacrylate | 5.6 |
| Di-t-butyl peroxide | 0.08 |
| Normal-butyl mercaptan | 0.24 |
Polymerization process is with embodiment 1.
2) take by weighing 52.8g poly(lactic acid) and 2.2g epoxy-functional acrylic polymer melt blending in the Haake torque rheometer, temperature of reaction is 180 ℃, rotating speed 60r/min, mixing time 10min, the weight-average molecular weight that the poly(lactic acid) of the chain extension modification that obtains records, balancing torque value, second-order transition temperature are listed in the table 1.
Embodiment 10:
1) a kind of preparation of epoxy-functional acrylic polymer:
| Component | Weight part |
| Butanone | 20 |
| Ethyl propenoate | 77.6 |
| Glycidyl acrylate | 2.4 |
| Di-t-butyl peroxide | 0.04 |
| Isobutyl-mercaptan | 0.24 |
Polymerization process is with embodiment 1.
2) take by weighing 50.05g poly(lactic acid) and 4.95g epoxy-functional acrylic polymer melt blending in the Haake torque rheometer, temperature of reaction is 180 ℃, rotating speed 60r/min, mixing time 10min, the weight-average molecular weight that the poly(lactic acid) of the chain extension modification that obtains records, balancing torque value, second-order transition temperature are listed in the table 1.
Embodiment 11:
1) a kind of preparation of epoxy-functional acrylic polymer:
| Component | Weight part |
| Tetrahydrofuran (THF) | 20 |
| Methyl methacrylate | 76.0 |
| Glycidyl methacrylate | 4.0 |
| Di-t-butyl peroxide | 0.08 |
| Tert-butyl mercaptan | 0.12 |
Polymerization process is with embodiment 1.
2) take by weighing 51.15g poly(lactic acid) and 3.85g epoxy-functional acrylic polymer melt blending in the Haake torque rheometer, temperature of reaction is 180 ℃, rotating speed 60r/min, mixing time 10min, the weight-average molecular weight that the poly(lactic acid) of the chain extension modification that obtains records, balancing torque value, second-order transition temperature are listed in the table 1.
The technical indicator of the poly(lactic acid) of table 1 chain extension modification
Annotate: weight-average molecular weight, balancing torque value (Nm), second-order transition temperature (℃) be the technical indicator of the poly(lactic acid) of corresponding chain extension modification.
Referring to data in embodiment 1 to embodiment 11 and the table 1 as can be known, in the synthesizing formula of epoxy-functional acrylic polymer: acrylic ester monomer is 64.4-88.2, vinylformic acid glyceride type auxiliary monomer is 1.4-7.2, the solvent that can dissolve acrylic polymer is 10-30, initiator is 0.04～0.16, and molecular weight regulator is 0.04～0.24 o'clock; Form the proportioning weight part when the blend of poly(lactic acid) and epoxy-functional acrylic polymer and be respectively 85-97, during 3-15, compare with pure polylactic resin, weight-average molecular weight, the second-order transition temperature of the poly(lactic acid) after the modification are greatly improved, the balancing torque value also increases, but the balancing torque value all below 10Nm, is suitable for following process.Wherein preferred embodiment is in the synthesizing formula of epoxy-functional acrylic polymer: the esters of acrylic acid main monomer is 76.8, vinylformic acid glyceride type auxiliary monomer is 3.2, the solvent that can dissolve acrylic polymer is 20, and initiator is 0.08, and molecular weight regulator is 0.12 o'clock; When the blend composition proportioning weight part of poly(lactic acid) and epoxy-functional acrylic polymer is respectively 85 and 15, the weight-average molecular weight of the poly(lactic acid) after the modification can reach 505,000, second-order transition temperature is elevated to 66.4 ℃, the balancing torque value is 9.8Nm, be suitable for following process, effect is the most obvious.
Comparative Examples 1:
Take by weighing 55g poly(lactic acid) melt blending in the Haake torque rheometer, temperature of reaction is 180 ℃, rotating speed 60r/min, mixing time 10min.The weight-average molecular weight that the poly(lactic acid) of the chain extension modification that obtains records, balancing torque value, second-order transition temperature are listed in the table 2.
Comparative Examples 2:
1) a kind of preparation of acrylic polymer:
| Component | Weight part |
| Toluene | 20 |
| Methyl methacrylate | 80 |
| Glycidyl methacrylate | 0.0 |
| Di-t-butyl peroxide | 0.08 |
| N-dodecyl mercaptan | 0.12 |
Polymerization process is with embodiment 1.
2) take by weighing 46.75g poly(lactic acid) and 8.25g acrylic polymer melt blending in the Haake torque rheometer, temperature of reaction is 180 ℃, rotating speed 60r/min, mixing time 10min.The weight-average molecular weight that the poly(lactic acid) of the chain extension modification that obtains records, balancing torque value, second-order transition temperature are listed in the table 2.
Comparative Examples 3:
1) a kind of preparation of epoxy-functional acrylic polymer:
| Component | Weight part |
| Toluene | 20 |
| Methyl methacrylate | 70.4 |
| Glycidyl methacrylate | 9.6 |
| Di-t-butyl peroxide | 0.08 |
| N-dodecyl mercaptan | 0.12 |
Polymerization process is with embodiment 1.
2) take by weighing 46.75g poly(lactic acid) and 8.25g epoxy-functional acrylic polymer melt blending in the Haake torque rheometer, temperature of reaction is 180 ℃, rotating speed 60r/min, mixing time 10min.The weight-average molecular weight that the poly(lactic acid) of the chain extension modification that obtains records, balancing torque value, second-order transition temperature are listed in the table 2.Comparative Examples 4:
1) a kind of preparation of epoxy-functional acrylic polymer:
| Component | Weight part |
| Toluene | 20 |
| Methyl methacrylate | 73.6 |
| Glycidyl methacrylate | 6.4 |
| Di-t-butyl peroxide | 0.08 |
| N-dodecyl mercaptan | 0.12 |
Polymerization process is with embodiment 1.
2) take by weighing 22g poly(lactic acid) and 33g epoxy-functional acrylic polymer melt blending in the Haake torque rheometer, temperature of reaction is 180 ℃, rotating speed 60r/min, mixing time 10min.The weight-average molecular weight that the poly(lactic acid) of the chain extension modification that obtains records, balancing torque value, second-order transition temperature are listed in the table 2.
Table 2
| Numbering | Poly(lactic acid) | Acrylic ester polymers | Acryllic acid is birdsed of the same feather flock together | The weight average molecule | Balancing torque | Vitrifying is changeed |
| Weight part | The compound weight part | The composition of compound | Amount | Value (Nm) | The alternating temperature degree (℃) | |
| 1 | 100 | 0 | -- | 138,000 | 1.7 | 61.4 |
| 2 | 85 | 15 | Comparative Examples 2 | 167,000 | 2.4 | 62.5 |
| 3 | 85 | 15 | Comparative Examples 3 | 1,401,000 | 20.1 | 67.6 |
| 4 | 40 | 60 | Comparative Examples 4 | 185,000 | 3.2 | 62.7 |
Referring to the data in the table 2, pure polylactic resin weight-average molecular weight is 198,000, and the balancing torque value is 1.7Nm, and second-order transition temperature is 61.4 ℃.
When the weight part of glycidyl methacrylate in the synthesizing formula of epoxy-functional acrylic polymer was 0, to compare variation very little with pure polylactic resin on weight-average molecular weight, balancing torque value and second-order transition temperature for the poly(lactic acid) after the modification.
When the weight part content of glycidyl methacrylate in the synthesizing formula of epoxy-functional acrylic polymer reaches 9.6, the weight-average molecular weight of modified polylactic resin reaches 1,401,000,67.6 ℃ of second-order transition temperatures, the balancing torque value reaches 20.1Nm, though that weight-average molecular weight can reach is very big, but the balancing torque value is too big, and material is not suitable for processing.
When the weight part of acrylic polymer was 60%, the weight-average molecular weight of blend was 185,000, and the balancing torque value is 3.2Nm, and second-order transition temperature is 62.7 ℃.At this moment blend main body is an acrylic polymer, no longer is that the chain extension properties-correcting agent as poly(lactic acid) has used, and can't investigate and contrast the effect after the chain extension modification.
Claims (2)
1. the application of an epoxy-functional acrylic polymer is characterized in that, it is used for polylactic acid modified chainextender;
Described epoxy-functional acrylic polymer is the random copolymers of polymethylmethacrylate and glycidyl methacrylate, and each molecular chain contains a plurality of epoxy-functionals, and its structural formula is as follows:
Wherein the span of m is 0-750, and the span of n is 0-750, and the span of x is 0-42, and the span of y is 0-42, and wherein m, n are not 0 simultaneously; X, y are not 0 simultaneously.
2. the application of a kind of epoxy-functional acrylic polymer as claimed in claim 1 is characterized in that, its step of usage that is used for polylactic acid modified chainextender is as follows:
Mass percent in the blend total amount is respectively 3～15% according to epoxy-functional acrylic polymer and polylactic resin: 85～97%, the blend in the Haake torque rheometer with polylactic resin and epoxy-functional acrylic polymer, temperature is under 180 ℃ of conditions, rotating speed is 60r/min, the blend time is 10min minute, obtains the poly(lactic acid) of chain extension modification.
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| CN102504093B (en) * | 2011-11-03 | 2014-02-26 | 长春工业大学 | Method for preparing polyacrylate rubber through continuous solution polymerization and devolatilization extrusion |
| CN102863596A (en) * | 2012-10-08 | 2013-01-09 | 中国科学院长春应用化学研究所 | Polylactic acid segmented copolymer and modified polylactic acid preparation method |
| CN102863596B (en) * | 2012-10-08 | 2014-05-21 | 中国科学院长春应用化学研究所 | Polylactic acid segmented copolymer and modified polylactic acid preparation method |
| CN103044907A (en) * | 2013-01-11 | 2013-04-17 | 长春工业大学 | Modified polyamide and preparation method thereof |
| CN104193879A (en) * | 2014-08-23 | 2014-12-10 | 山西省化工研究所（有限公司） | Melt reinforcing agent with functional group as well as preparation and application of melt reinforcing agent |
| CN112898740A (en) * | 2019-12-03 | 2021-06-04 | 胡长容 | Talcum powder filled biodegradable blown film material and preparation method thereof |
| CN111484709A (en) * | 2019-12-31 | 2020-08-04 | 南通龙达生物新材料科技有限公司 | Talcum powder filled full-biodegradation special film blowing material and preparation method thereof |
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