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Preparation method of oriented gamma-phase PVDF/CTAB composite film

A composite film and orientation technology, which is applied in the field of preparation of oriented γ-phase PVDF/CTAB composite films, can solve the problem of low γ-phase content, achieve excellent dielectric properties, convenient operation, and excellent high temperature resistance

Pending Publication Date: 2021-09-03
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of polyvinylidene fluoride in the prior art usually adopts the method of melt stretching, which has the defect of low γ phase content

Method used

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  • Preparation method of oriented gamma-phase PVDF/CTAB composite film
  • Preparation method of oriented gamma-phase PVDF/CTAB composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for preparing an oriented γ-phase PVDF / CTAB composite film, specifically comprising the following steps:

[0021] 1) Place PVDF and CTAB pellets in a vacuum oven at 70°C, and dry for 12 hours to remove moisture;

[0022] 2) Take the dried pellets in step 1), mix them evenly with a mass ratio of 100 / 0.1, and press them into a dumbbell-shaped sample at a temperature of 190°C using a hot press;

[0023] 3) rapidly cooling the dumbbell-shaped sample in step 2) at room temperature to obtain a dumbbell-shaped sample of PVDF / CTAB;

[0024] 4) Stretch the dumbbell-shaped sample in step 3) in a high-low temperature tensile machine at a stretching temperature of 150° C. and a stretching rate of 5 mm / min to obtain a PVDF / CTAB composite film.

Embodiment 2

[0026] A method for preparing an oriented γ-phase PVDF / CTAB composite film, specifically comprising the following steps:

[0027] 1) Place PVDF and CTAB pellets in a vacuum oven at 75°C, and dry for 14 hours to remove moisture;

[0028] 2) Mix the pellets dried in step 1) uniformly at a ratio of 100 / 0.2, and press a hot press at a temperature of 192°C to form a dumbbell-shaped sample;

[0029] 3) rapidly cooling the dumbbell-shaped sample in step 2) at room temperature to obtain a dumbbell-shaped sample of PVDF / CTAB;

[0030] 4) Stretch the dumbbell-shaped sample in step 3) in a high-low temperature tensile machine at a stretching temperature of 152° C. and a stretching rate of 10 mm / min to obtain a PVDF / CTAB composite film.

Embodiment 3

[0032] A method for preparing an oriented γ-phase PVDF / CTAB composite film, specifically comprising the following steps:

[0033] 1) Place PVDF and CTAB pellets in a vacuum oven at 80°C, and dry for 16 hours to remove moisture;

[0034] 2) Mix the pellets dried in step 1) evenly with a ratio of 100 / 0.5, and press a hot press at a temperature of 194°C to form a dumbbell-shaped sample;

[0035] 3) rapidly cooling the dumbbell-shaped sample in step 2) at room temperature to obtain a dumbbell-shaped sample of PVDF / CTAB;

[0036] 4) Stretch the dumbbell-shaped sample in step 3) in a high-low temperature tensile machine at a stretching temperature of 154° C. and a stretching rate of 50 mm / min to obtain a PVDF / CTAB composite film.

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Abstract

The invention relates to a preparation method of an oriented gamma-phase PVDF / CTAB composite film, which adopts cetyltrimethylammonium bromide (CTAB) to improve the phase change ability of polyvinylidene fluoride (PVDF), increases the nucleation rate of a polyvinylidene fluoride gamma phase under the action of low-temperature nucleation and high-temperature crystallization, accelerates the growth rate of the gamma phase, and obtains oriented gamma-phase PVDF under the action of high-temperature stretching. The oriented gamma-phase PVDF / CTAB composite film can be rapidly prepared; detection and comparison show that the stretched PVDF / CTAB composite film contains a large amount of oriented gamma-phase PVDF; the preparation process is simple, the operation is convenient, and the material has excellent properties of high temperature resistance, corrosion resistance, piezoelectricity and strong ferroelectricity, can be used as a high-temperature-resistant functional polymer material, and has potential application values in the aspects of capacitors, sensors, information storage, electronic devices and high-temperature-resistant heat-sensitive materials.

Description

[0001] The invention belongs to the technical field of polymer film preparation, and in particular relates to a preparation method of an oriented γ-phase PVDF / CTAB composite film. Background technique [0002] The functionalization of polymer film materials has been widely concerned. Polyvinylidene fluoride (PVDF) is a polymorphic semi-crystalline polymer. There are three most common crystal forms, namely α, β and γ; α-phase polyvinylidene fluoride has excellent mechanical properties and can be used in electronics, chemicals, solar devices, etc.; β-phase polyvinylidene fluoride has good piezoelectric and ferroelectric effects, and is widely used in transducer devices in various fields, such as piezoelectric Sensitive devices, humidity sensitive devices, etc.; the γ phase also has ferroelectricity and piezoelectricity, and the Curie temperature of the γ phase is higher than that of the β phase, which is an excellent high temperature resistant flexible piezoelectric material. Or...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L27/16C08K5/19
CPCC08J5/18C08J2327/16C08K5/19
Inventor 王海军刘坤刘子雄
Owner SHAANXI UNIV OF SCI & TECH
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