Fluorinated electroactive cross-linkable polymers comprising photoactive groups

A technology of fluorination and radicals, applied in the field of electroactive fluoropolymers, can solve problems such as deterioration of electroactive properties and complex preparation of polymer films, and achieve the effect of high saturation polarization and high dielectric constant

Pending Publication Date: 2021-09-28
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 cause degradation of electroactive properties

Method used

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  • Fluorinated electroactive cross-linkable polymers comprising photoactive groups
  • Fluorinated electroactive cross-linkable polymers comprising photoactive groups
  • Fluorinated electroactive cross-linkable polymers comprising photoactive groups

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0248] In the first Schlenk tube was placed 0.6 g of P(VDF-TrFE-CTFE) terpolymer with molar composition 61.7 / 28.3 / 10, followed by 10 mL of acetone. The mixture was stirred until the polymer dissolved. In a second Schlenk tube, 4-hydroxybenzophenone (0.79 g, 4.0 mmol), potassium carbonate (0.83 g, 6.0 mmol) and 15 mL of acetone were stirred at 50° C. for 1 hour under an inert atmosphere. After cooling the second solution to room temperature, the contents of the (second) Schlenk tube were filtered through a 1 μm PTFE filter and transferred into the first Schlenk tube, and the first Schlenk tube was heated at 50 °C 3 days. The solution was then cooled and precipitated twice from water acidified with a few drops of hydrochloric acid. The fleecy white solid was then washed twice with ethanol and twice with chloroform. The modified polymer was dried overnight at 60°C in a vacuum oven.

[0249] Final product by FTIR, SEC and liquid 1 H NMR characterization. The final polymer co...

Embodiment 2

[0255] A solution of the polymer synthesized as above was prepared in cyclopentanone having a proportion of 4% by mass. Films of this polymer were formed by spin coating at 1000 rpm. The polymer was subjected to heat pretreatment at 130° C. for 5 minutes. It was then placed under an inert atmosphere (nitrogen) using a mask at 6J.cm -2 doses exposed to UV radiation. The polymer irradiated selectively in a pattern was subjected to a second thermal pretreatment at 130° C. for 5 minutes. It was then developed at room temperature in a mixture of 80 / 20 mass ratio of isopropanol and cyclopentanone for 2 minutes, followed by rinsing with isopropanol.

[0256] The obtained film was photographed by light microscopy (see image 3 ). The polymers correspond to darker regions.

[0257] Figure 4 is the relative dielectric permittivity curve at 1kHz. The crosslinked films retained good electroactive properties, with a relative dielectric permittivity greater than 20 and a maximum va...

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Abstract

The present invention concerns a copolymer comprising fluorinated units of formula (I): (I) -CX1X2-CX3X4- in which each of X1, X2, X3 and X4 is independently chosen among H, F and alkyl groups comprising 1 to 3 carbon atoms which are optionally partially or completely fluorinated; and fluorinated units of formula (II): (II) -CX5X6-CX7Z- in which each of X5, X6, X7 is independently chosen among H, F and alkyl groups comprising 1 to 3 carbon atoms which are optionally partially or completely fluorinated, and in which Z is a photoactive group of formula -Y-Ar-R, Y representing an oxygen atom or an NH group or a sulfur atom, Ar representing an aryl group, preferably a phenyl group and R being a monodentate or bidentate group comprising 1 to 30 carbon atoms. The present invention also concerns a method for preparing this copolymer, a composition comprising this copolymer and a film obtained from the copolymer.

Description

technical field [0001] The present invention relates to crosslinkable electroactive fluoropolymers comprising photoactive groups, 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 paper Vinylidene fluoride-and trifluoroethylene-containing fluorinated electroactive copolymers. How does chemistry impact properties? . These polymers have particularly interesting dielectric and electromechanical properties. Fluorinated copolymers formed from vinylidene fluoride (VDF) and trifluoroethylene (TrFE) monomers are of particular interest due to their piezoelectric, pyroelectric and ferroelectric properties. They allow inter alia to convert mechanical or thermal energy into electrical energy, or vice versa. [0003] Some of these fluorinated copolymers also comprise units derived from additional monomers bearing chlorine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22C08F8/00H01L41/193H01L41/317
CPCC08F8/00C08J5/18C08J2327/16C08F2800/10G03F7/038C08F2810/50C08F8/26C08F214/22C08F214/182C08F214/24C09D127/22G03F7/0046G03F7/033H10N30/857H10N30/077H10N30/082C08F220/18C08F222/10C09D11/106C09D11/30G03F7/30
Inventor F.多明格斯多斯桑托斯T.索莱斯丁G.哈德齐奥安诺E.克劳泰特C.布罗琼K.卡利特西斯
Owner ARKEMA FRANCE SA
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