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Crosslinkable electroactive fluorinated polymers

A technology of copolymers and compositions, applied in the direction of coatings, etc., can solve the problems of deterioration of electroactive properties and complex preparation of polymer films

Active Publication Date: 2020-05-22
ARKEMA FRANCE SA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Addition of this reagent complicates the preparation of polymer films and can lead to deterioration of electroactive properties

Method used

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  • Crosslinkable electroactive fluorinated polymers
  • Crosslinkable electroactive fluorinated polymers
  • Crosslinkable electroactive fluorinated polymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0177] Example 1 - Manufacture of modified polymers according to the invention

[0178] The starting material used was a P(VDF-TrFE-CTFE) terpolymer. The terpolymer comprises 61.8 mol % of units derived from VDF, 30.4 mol % of units derived from TrFE and 7.8 mol % of units derived from CTFE.

[0179] 1.2 g of terpolymer powder was dissolved in 50 ml of dimethylformamide. Then 39 mg (0.5 molar equivalent, relative to the number of moles of CTFE) of NaN 3 Add to reaction mixture. The reaction was maintained at 55°C for 12 hours. The product was recovered after precipitation from deionized water. It was then filtered and dried under vacuum at 40° C. for 24 hours.

[0180] Then with 0.1 molar equivalent or 10 molar equivalent of NaN 3 Repeat the experiment relative to moles of CTFE.

[0181] Infrared spectra of various polymers were obtained directly on polymer films using a Fourier Transform Infrared (FTIR) spectrometer in ATR (reflection) mode:

[0182] The results are s...

Embodiment 2

[0188] Example 2 - Fabrication of a film according to the invention with UV irradiation

[0189] The 7 mass % formulation in butan-2-one was obtained by mixing an unmodified P(VDF-TrFE-CTFE) terpolymer comprising 7.8 mol % of CTFE-derived units in a 50 / 50 mixed (by mass) with an additional P(VDF-TrFE-CTFE) terpolymer initially comprising 12.7 mol % of units derived from CTFE, and in the same manner as in Example 1 with 0.5 equivalents of NaN 3 modified.

[0190] From the formulations prepared above, 250 nm films were fabricated on silicon substrates on a spin coater. The resulting film was subsequently dried at 60° C. for 5 minutes.

[0191] The film was crosslinked according to a predetermined pattern by UV irradiation (mainly at a wavelength of 300 to 400 nm) at an applied dose of 20 J / cm 2 . The membrane was then developed by rinsing in cyclopentanone for 1 minute at ambient temperature.

[0192] available at figure 2 See the resulting pattern in the picture. The d...

Embodiment 3

[0199] Example 3 - Manufacture of a membrane according to the invention by heat treatment

[0200] Using the modified polymer of Example 1 (with 0.5 molar equivalents of NaN 3 obtained), and to fabricate membranes from this polymer.

[0201] The film has a thickness of 2 μm. It was fabricated on a spin coater and dried at 60 °C for 5 min.

[0202] Infrared spectra of the films were measured before and after crosslinking. Heat crosslinking at 125°C for 20 minutes.

[0203] result in Figure 5 visible in the figure. The upper spectrum is the spectrum of the film before crosslinking and the lower spectrum is the spectrum of the film after crosslinking. The disappearing band was observed at 2150cm -1 The band at (which is characteristic of the azide functional group) and at 1710cm -1 A band at (which is characteristic of an intrachain C=C double bond).

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Abstract

The invention relates to a copolymer comprising units derived from monomers of vinylidene fluoride and / or trifluoroethylene, as well as fluorinated monomers X comprising a double bond and a leaving group selected from among chlorine, bromine and iodine atoms, the leaving groups being partially replaced by azide groups in the copolymer.

Description

technical field [0001] The present invention relates to crosslinkable electroactive fluorine-containing (fluoro, fluorinated) polymers, processes for their preparation, and membranes made therefrom. Background technique [0002] Electroactive fluoropolymers or EAFPs are primarily derivatives of polyvinylidene fluoride (PVDF). In this regard, see the article by Soulestin et al. in Prog. Polym. Sci. 2017: Vinylidene fluoride-andtrifluoroethylene-containing fluorinated electroactive copolymers. How does chemistry impact properties? (DOI: 10.1016 / j.progpolymsci.2017.04.004). These polymers exhibit particularly interesting dielectric and electromechanical properties. Fluorinated copolymers formed from vinylidene fluoride (VDF) and trifluoroethylene (TrFE) monomers have attracted particular attention due to their piezoelectric, pyroelectric, and ferroelectric properties. In particular, they allow the conversion of mechanical or thermal energy into electrical energy and vice ver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/30C09D127/16C09D127/22C08F214/22
CPCC08F214/182C08F214/22C08F214/24C08F8/30C09D127/16C09D127/22C08F2800/10C08F2810/50C08L2205/02C08L27/22C08L27/16C08J5/18C08J2327/16C08J2327/22C08F214/04C08F214/16C08L2203/16C08L2203/20C08L2205/025C08L2312/00
Inventor G.哈德齐奥安诺E.克劳泰特C.布罗乔恩D.图奥K.卡尔利特西斯F.多明格斯多斯桑托斯T.索莱斯汀
Owner ARKEMA FRANCE SA
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