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Polar crystal-form polyvinylidene fluoride and preparation method of composite thereof

A technology of polyvinylidene fluoride and composite materials, which is applied in the field of functional polymer materials and can solve problems such as the lack of cetyltrimethylammonium bromide to regulate the polar crystal form

Inactive Publication Date: 2013-01-16
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no relevant patent report on the use of cetyltrimethylammonium bromide to regulate the polar crystal form in PVDF and its composite materials

Method used

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  • Polar crystal-form polyvinylidene fluoride and preparation method of composite thereof
  • Polar crystal-form polyvinylidene fluoride and preparation method of composite thereof
  • Polar crystal-form polyvinylidene fluoride and preparation method of composite thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0035] PVDF (Sigma-Aldrich427152; weight-average molecular weight Mw: 180000g / mol; number-average molecular weight Mn: 71000g / mol;) and CTAB (Chengdu Kelong Reagent Chemical Factory) were dispersed in DMF respectively, polyvinylidene fluoride and CTAB in The concentrations in the solvent were 0.1 g / ml and 0.05 mg / ml respectively. The two solutions were mixed in different proportions. The specific formulations are shown in Table 1, and the solvent was evaporated at 120°C.

[0036] Table 1

[0037] Example

Embodiment 5-8

[0039] Melt the film sample obtained by evaporating the solvent after mixing the solution with the same formula (see Table 2) as in Examples 1-4, heat to 220°C to eliminate the heat history for 10 minutes, cool down to 155°C for isothermal crystallization of the melt, and isothermally The crystallization time is 90min.

[0040] Table 2

[0041] Example

Embodiment 9-15

[0043] Disperse PVDF (FR903, Shanghai 3F New Materials Co., Ltd.), CTAB (Chengdu Kelong Reagent Chemical Factory) and graphite oxide (GO, self-made by Hummers method) in DMF respectively, and the concentration of PVDF, CTAB and GO in the solvent They are 0.05g / ml, 0.05mg / ml and 0.5mg / ml respectively. The three groups of dispersions were mixed in different proportions, and the specific formulations are shown in Table 3. After ultrasonic stirring for 1 hour, it was poured into deionized water for flocculation. The volume of deionized water was 10 times the volume of the solution, and the flocs were dried in a blast oven at 100°C for 48 hours, so that the solvent weight fraction was less than 0.01%. Then molded at 10MPa, 200℃. Eliminate thermal history at 220°C for 10 minutes, and crystallize isothermally at 160°C for 60 minutes.

[0044] table 3.

[0045]

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PUM

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Abstract

The invention discloses polar crystal-form polyvinylidene fluoride and a preparation method of a composite thereof. The preparation method includes: adding CTAB (cetyltrimethyl ammonium bromide) serving as nucleating agents so as to obtain high-content polar crystals, using 40%-99.9% of PVDF (polyvinylidene fluoride), 0.1%-10% of the cetyltrimethyl ammonium bromide and 0%-50% of packing as raw materials, uniformly mixing the raw materials by solution mixing or melting mixing, and forming so that the target composite is obtained. Highly-polar crystal-form PVDF material and the composite thereof are prepared by adding the CTAB playing a remarkable role in nucleation of polyvinylidene fluoride polar crystal forms. The composite can be formed by the aid of various methods (solution method and melting method) and various processing equipment (extruding, injection molding and mould pressing), and the preparation method is simple and convenient.

Description

technical field [0001] The invention relates to the technical field of functional polymer materials, in particular to a preparation method of polyvinylidene fluoride containing a polar crystal form and a composite material. Background technique [0002] Polyvinylidene fluoride (PVDF) is a typical polymorphic polymer. Due to the different conformation and arrangement of molecular chains when discharged into the unit cell, the crystal has polar and non-polar differences. The α crystal is its non-polar crystal, and the β and γ crystals are its polar crystal. After the polar crystal is polarized by the electric field, the dipoles are further arranged, which can show strong piezoelectricity, ferroelectricity and pyroelectricity, and the polymer material itself has the advantages of softness and easy processing, making it extremely The PVDF material that exists in the form of a neutral crystal can be widely used in: energy conversion (such as sensors, leak detectors, power genera...

Claims

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Application Information

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IPC IPC(8): C08L27/16C08K5/17C08K7/00C08K3/04C08K3/26C08K3/34
Inventor 李忠明李越钟淦基
Owner SICHUAN UNIV
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