CN107459745A - A kind of promotion method of the Kynoar alpha-crystal form to γ crystal transfers - Google Patents
A kind of promotion method of the Kynoar alpha-crystal form to γ crystal transfers Download PDFInfo
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- CN107459745A CN107459745A CN201610408951.1A CN201610408951A CN107459745A CN 107459745 A CN107459745 A CN 107459745A CN 201610408951 A CN201610408951 A CN 201610408951A CN 107459745 A CN107459745 A CN 107459745A
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- crystal
- kynoar
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- pvdf
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/24—Crystallisation aids
Abstract
The present invention discloses a kind of promotion method of the Kynoar alpha-crystal form to γ crystal transfers, and adding graphene in Kynoar carries out melting mixing, so that graphene and Kynoar are sufficiently mixed.Tabletting is taken out in banburying after terminating, and carries out melting isothermal crystal.DSC tests are carried out to the sample after crystallizing completely, analyze the change of its crystalline texture, Kynoar α → γ crystal transfer speed can be improved by finding the addition of graphene, and more notable with the increase of graphene content.
Description
Technical field
The invention belongs to Kynoar plastics modification technology field, and in particular to one kind promotes Kynoar α → γ brilliant
The method of type transition process.
Background technology
Kynoar (PVDF) is due to good mechanical property, heat endurance and chemical stability, thermoelectricity and pressure
Electrostrictive coefficient is high, easily processed into type to wait many merits, be widely used in petrochemical industry, fluorocarbon coating, electronic component,
The fields such as film article.
Kynoar is a kind of common heteromorphic polymer, and the crystal formation that hitherto reported has found has α, β, γ, δ
Brilliant 5 kinds with ε, wherein α, β, γ crystalline substance is common crystal formation.It is institute by the α crystalline substances that crystallisation by cooling obtains from melt
There is most stable in crystal formation, most common crystal formation.Two strand arranged anti-parallels are in TGTG ' conformations in α structure cells, dipole moment
It is zero, externally not salience(-cy), without ferroelectric properties, can only be used as common plasticses.Strand in β structure cells, which is taken, to be all-trans
Formula TTT planar zigzag form conformations, there is very strong polarity, there is stronger ferroelectric properties.β crystalline substances generally lead at low temperature
Cross mechanical stretching pvdf membrane or crystallized from polar solvent to obtain, which has limited its production and application scope.γ is brilliant to be also
Common a kind of important crystal formation in PVDF, two strands are in TTTGTTTG ' conformations in structure cell, external as β crystalline substances
Polarity is shown, there is piezoelectricity and pyroelectric effect, the focus paid close attention to and studied as people in recent years.
γ phases generally crystallize from melt or in solution at a higher temperature, can also move back α phases PVDF at high temperature
It is brilliant that fire processing obtains γ.Due to degree of supercooling very little, γ phases PVDF crystalline rate is very low, and has substantial amounts of α phases altogether
Deposit.The crystalline rates of γ phases PVDF at high temperature can be promoted by adding the nucleators such as KBr, but the γ generated is brilliant
Fusing point is relatively low.Other methods such as can be prepared by regular by anodic oxidation aluminium formwork solution wetting method, micro-embossing technology
γ phase PVDF, but its technical difficulty is big, and cost consumption is high, and practical significance is little.Based on this background, the present invention carries
A kind of short-cut method for accelerating Kynoar α → γ crystal transfer processes is supplied.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide be one kind to add graphene filler as means,
It is blended by conventional melt and obtains PVDF/ graphene composite materials, remarkably promotes α → γ crystal formations in PVDF crystallization process
The method of transformation.
The technical purpose of the present invention is achieved by following technical proposals：
A kind of promotion method of the Kynoar alpha-crystal form to γ crystal transfers, adds graphene progress in Kynoar
Melting mixing, so that both are sufficiently mixed uniformly.
The melting mixing temperature be 150-250 degrees Celsius, preferably 200-250 degrees Celsius, more preferred 220-230
Degree Celsius.
The melting mixing time is 10-30min, preferably 15-25min.
The addition of graphene be no more than the 1% of Kynoar quality, and more than zero, preferred Kynoar quality
0.05-0.5wt%.
In the range of the addition of graphene, as graphene adds the increase of connection, Kynoar alpha-crystal form is to γ crystal formations
The effect of transformation is all the more obvious, i.e. the conversion rates of alpha-crystal form to γ crystal formations are faster.
The good Polyvinylidene fluoride/graphene composite of banburying is obtained after completing to be kneaded, compression molding instrument two is loaded into and adds
Between hot plate, 10min is first melted at 230 DEG C, 30MPa is then progressively pressurized to, is pressed into certain thickness film,
Pressurize on coldplate is transferred to after pressurize 5min to shape.The film suppressed is cut into diameter about 18mm with circular cut-off knife
Disk.Circle sheet is loaded into the shear cell of the CSS450 shearing thermal station with petrographic microscope, with 30 DEG C/min
The rate of heat addition be warming up to 230 DEG C and make sample melted.Progressively the distance between regulation shearing thermal station upper and lower bottom plate is caught up with to certain value
The air remained in melt is walked, is incubated 10min to eliminate thermal history.170 DEG C are dropped to 30 DEG C/min rate of temperature fall, and
Isothermal crystal at such a temperature.The melting process crystallized using the CCD synchronous recordings PVDF on petrographic microscope.Such as figure
(i.e. photo a to f orders is shown) shown in 1, the rise with crystallization temperature, ball are can be seen that by POM images
The part of brilliant outer most edge disappears first；Continue to raise temperature, part spherocrystal starts to disappear, and these are α brilliant.When temperature surpasses
After crossing 180 DEG C, the small spherocrystal (γ crystallized from melt phase is brilliant) with irregular black cross disappears.When temperature reaches
To after 190 DEG C, big Ring-banded spherulite (α → γ changes intermediate state) also disappears, only central area (the α of remaining spherocrystal
The γ ' of → γ transformation generations is brilliant) continue to keep birefringent phenomenon, until temperature reaches 200 DEG C, all spherocrystals all melt
Disappear.
Brief description of the drawings
Fig. 1 is the resonance offset effect of heating melting process after PVDF isothermal crystals.
Fig. 2 is DSC melting curve of the sample after 170 DEG C of isothermal crystals that graphene content is 0.05wt%.
Fig. 3 is DSC melting curve of the sample after 170 DEG C of isothermal crystals that graphene content is 0.5wt%.
Embodiment
With reference to specific embodiment, the present invention is described in further detail.
Embodiment 1
100g PVDF (Solvay S.A., Brussels, Belgium.) are added to the close of XSS-30 torque rheometers at 230 DEG C
Refining is indoor, and banburying 10min is melted at 230 DEG C, then adds 0.05g graphene (the hexa-atomic cellulosic material high-tech stocks in Changzhou
Part Co., Ltd, SE1231), continue in 230 DEG C of melting mixing 15min so that graphene and PVDF are sufficiently mixed, it is close
Refining takes out tabletting after terminating, and obtains PVDF/ graphene composite materials.It is processed that same banburying is carried out to PVDF pure materials
Journey, used with comparing.
Between the good PVDF/ graphene composite materials of banburying are added into the heating plate of compression molding instrument two, in 230 DEG C of meltings
10min, 30MPa is then progressively pressurized to, pressurize on coldplate is transferred to after pressurize 5min and is shaped, compacting obtains 1mm
Thickness piece, and it is cut into diameter 18mm disk.
Disk is added in the shear cell of CSS450 shearing thermal station, being warming up to 230 DEG C with the 30 DEG C/min rate of heat addition makes sample
Product melt.Progressively the distance between regulation shearing thermal station upper and lower bottom plate is incubated 10min to eliminate thermal history to 500 microns.
Default 170 DEG C of crystallization temperature, and isothermal crystal different time at such a temperature are dropped to 30 DEG C/min rate of temperature fall.
Take out and crystallize complete sample progress DSC tests, its melting curve is as shown in Fig. 2 from figure 2 it can be seen that 170
DEG C isothermal crystal 24h, pure PVDF only two melting peaks of appearance at 174 DEG C and 182 DEG C, correspond to PVDF respectively
α and γ it is brilliant.And the sample containing 0.05wt% graphenes has 4 melting peaks, respectively 173.6 DEG C, 181.5 DEG C,
189.7 DEG C and 200 DEG C.But if by pure PVDF at 170 DEG C isothermal crystal 36h, also can be at 189.7 DEG C and 200
Occurs weaker melting peak at DEG C two, the two peaks are respectively α → γ transformation intermediate states and the brilliant melting peaks of γ '.With
α → γ crystal transfers can occur for the increase of crystallization time, PVDF, and crystallization time is longer, and α → γ crystal transfer rates are higher.
Melting after the PVDF/ graphene sample isothermal crystals 24h that graphene content is 0.05wt% at 189.7 DEG C and 200 DEG C
Peak is more obvious than pure PVDF sample isothermal crystals 36h.Illustrate the graphene that its quality 0.05% is added in PVDF, energy
Promote α → γ crystal transfers during PVDF isothermal crystals, improve the brilliant conversion rates brilliant to γ of α.
Embodiment 2
100g PVDF (Solvay S.A., Brussels, Belgium.) are loaded into XSS-30 torque rheometers at 230 DEG C
In banburying chamber, banburying 10min is melted at 230 DEG C.Then 0.5g graphene (the hexa-atomic cellulosic material high-tech stocks in Changzhou are added
Part Co., Ltd, SE1231) in 230 DEG C of melting mixing 15min so that graphene and PVDF are sufficiently mixed, banburying terminates
After take out tabletting, PVDF/ graphene composite materials are prepared.Same banburying process is carried out to PVDF pure materials,
Used with comparing.
Between the good Polyvinylidene fluoride/graphene composite of banburying is loaded into the heating plate of compression molding instrument two, first 230
10min is melted at DEG C, is then progressively pressurized to 30MPa, pressurize on coldplate is transferred to after pressurize 5min and is shaped, compacting
The thin slice thick into 1mm, and it is cut into diameter 18mm disk.
Disk is added in the shear cell of CSS450 shearing thermal station, being warming up to 230 DEG C with the 30 DEG C/min rate of heat addition makes sample
Product melt.Progressively the distance between regulation shearing thermal station upper and lower bottom plate is incubated 10min to eliminate thermal history to 500 microns.
Default 170 DEG C of crystallization temperature, and isothermal crystal different time at such a temperature are dropped to 30 DEG C/min rate of temperature fall.
Take out and crystallize complete sample progress DSC tests, its melting curve is as shown in figure 3, from figure 3, it can be seen that pure
PVDF is in 170 DEG C of isothermal crystal 24h, only 174 DEG C (α is brilliant) and 182 DEG C (γ is brilliant) two melting peaks.Contain
There are 4 melting peaks, respectively 173.6 DEG C, 181.5 DEG C, 189.7 DEG C and 200 DEG C in the sample of 0.5wt% graphenes.Pure
PVDF isothermal crystal 36h at 170 DEG C, can also occur weaker melting peak at 189.7 DEG C and 200 DEG C two, it is right respectively
Answer the melting peak of α → γ transformation intermediate states and γ ' crystalline substances.PVDF is when high-temperature fusion crystallizes, with the increasing of crystallization time
Add, it may occur that α → γ crystal transfers, crystallization time is longer, and α → γ crystal transfer rates are higher.Graphene content is 0.5wt%
Sample isothermal crystal 24h after, melting peak intensity at its 189.7 DEG C and 200 DEG C is apparently higher than pure PVDF isothermal crystals
Melting peak intensity corresponding to isothermal crystal 24h when 36h or graphene content are 0.05wt%.Illustrate to add its matter in PVDF
The graphene of amount 0.5%, α → γ crystal transfers during PVDF isothermal crystals can be promoted, improve α crystalline substances to γ crystalline substances
Conversion rates, and become apparent during low content graphene compared with 0.05wt%.
Exemplary description has been done to the present invention above, it should explanation, in the case where not departing from the core of the present invention,
Any simple deformation, modification or other skilled in the art can not spend the equivalent substitution of creative work to fall
Enter protection scope of the present invention.
Claims (5)
1. a kind of promotion method of the Kynoar alpha-crystal form to γ crystal transfers, it is characterised in that added in Kynoar
Graphene carries out melting mixing, so that both are sufficiently mixed uniformly, melting mixing temperature is 150-250 degrees Celsius, melting
Mixing time is 10-30min, and the addition of graphene is no more than the 1% of Kynoar quality, and more than zero.
A kind of 2. promotion method of the Kynoar alpha-crystal form to γ crystal transfers according to claim 1, it is characterised in that
The melting mixing temperature is 200-250 degrees Celsius, more preferred 220-230 degrees Celsius.
A kind of 3. promotion method of the Kynoar alpha-crystal form to γ crystal transfers according to claim 1, it is characterised in that
The melting mixing time is 15-25min.
A kind of 4. promotion method of the Kynoar alpha-crystal form to γ crystal transfers according to claim 1, it is characterised in that
The addition of graphene is 0.05-0.5wt% of Kynoar quality.
A kind of 5. promotion method of the Kynoar alpha-crystal form to γ crystal transfers according to claim 1, it is characterised in that
In the range of the addition of graphene, as graphene adds the increase of connection, Kynoar alpha-crystal form is to γ crystal transfers
Effect it is all the more obvious, i.e. the conversion rates of alpha-crystal form to γ crystal formations are faster.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610408951.1A CN107459745A (en) | 2016-06-05 | 2016-06-05 | A kind of promotion method of the Kynoar alpha-crystal form to γ crystal transfers |
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| CN201610408951.1A CN107459745A (en) | 2016-06-05 | 2016-06-05 | A kind of promotion method of the Kynoar alpha-crystal form to γ crystal transfers |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109320743A (en) * | 2018-11-26 | 2019-02-12 | 北京化工大学 | The preparation method of polyvinylidene difluoride film |
| CN109694486A (en) * | 2018-11-20 | 2019-04-30 | 北京化工大学 | The preparation method of 100% γ phase PVDF thin film |
| CN111205496A (en) * | 2020-02-28 | 2020-05-29 | 北京化工大学 | Preparation method of polyvinylidene fluoride gamma-type crystal |
Citations (4)
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|---|---|---|---|---|
| JPS55104009A (en) * | 1979-02-02 | 1980-08-09 | Matsushita Electric Ind Co Ltd | Piezooelectric or pyroelectric polyvinylidene fluoride |
| CN103146024A (en) * | 2013-03-19 | 2013-06-12 | 苏州格瑞丰纳米科技有限公司 | Porous graphene/polymer composite structure and preparation method and application thereof |
| CN103467894A (en) * | 2013-08-23 | 2013-12-25 | 中国科学院宁波材料技术与工程研究所 | Polyvinylidene fluoride/graphene composite material and preparation method thereof |
| US20150267030A1 (en) * | 2012-10-19 | 2015-09-24 | Rutgers, The State University Of New Jersey | In Situ Exfoliation Method to Fabricate a Graphene-Reinforced Polymer Matrix Composite (G-PMC) |
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Patent Citations (4)
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|---|---|---|---|---|
| JPS55104009A (en) * | 1979-02-02 | 1980-08-09 | Matsushita Electric Ind Co Ltd | Piezooelectric or pyroelectric polyvinylidene fluoride |
| US20150267030A1 (en) * | 2012-10-19 | 2015-09-24 | Rutgers, The State University Of New Jersey | In Situ Exfoliation Method to Fabricate a Graphene-Reinforced Polymer Matrix Composite (G-PMC) |
| CN103146024A (en) * | 2013-03-19 | 2013-06-12 | 苏州格瑞丰纳米科技有限公司 | Porous graphene/polymer composite structure and preparation method and application thereof |
| CN103467894A (en) * | 2013-08-23 | 2013-12-25 | 中国科学院宁波材料技术与工程研究所 | Polyvinylidene fluoride/graphene composite material and preparation method thereof |
Non-Patent Citations (2)
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| BENPING WANG等: "Double equilibrium melting temperatures and zero growth temperature of PVDF in PVDF/graphene composites", 《JOURNAL OF POLYMER RESEARCH》 * |
| 田鹏飞: "石墨烯诱导压电聚合物的高压相变研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅰ辑》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109694486A (en) * | 2018-11-20 | 2019-04-30 | 北京化工大学 | The preparation method of 100% γ phase PVDF thin film |
| CN109694486B (en) * | 2018-11-20 | 2022-10-14 | 北京化工大学 | Preparation method of 100% gamma-phase PVDF film |
| CN109320743A (en) * | 2018-11-26 | 2019-02-12 | 北京化工大学 | The preparation method of polyvinylidene difluoride film |
| CN111205496A (en) * | 2020-02-28 | 2020-05-29 | 北京化工大学 | Preparation method of polyvinylidene fluoride gamma-type crystal |
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Application publication date: 20171212 |