A kind of cross-linked fluoropolymer-based dielectric elastomer composite material and preparation method thereof

Abstract

The invention discloses a crosslinked fluorine polymer based dielectric elastomer compound material and a preparation method therefor. The compound material comprises the following components in parts by mass: 60-90 parts of a fluorine polymer matrix, 8-40 parts of a functional crosslinker and 1-3 parts of a catalyst. The preparation method comprises the steps of adding 50-120 parts of a solvent into a flask, then adding 60-90 parts of an internal double bond-containing polyvinylidene fluoride copolymer, and performing strong stirring for 30 minutes; dropwise adding 8-40 parts of functional crosslinker molecules with strong stirring, and continuing to stir at the room temperature for 20-30 minutes; then dropwise adding 1-3 parts of the catalyst and stirring for reaction at 40-60 DEG C for 8-10 hours; after cooling to the room temperature, filtering a reaction solution, performing tape casting on a glass flat plate, putting the glass flat plate into a uniform heat environment, gradually heating to 60-100 DEG C, drying for 4-8 hours to remove the solvent, thereby obtaining a crosslinked fluorine polymer based dielectric elastomer compound material membrane on the glass flat plate. According to the method, the low-driving-voltage and high-electrodeformation total-organic dielectric elastomer compound material can be obtained by adopting the self-synthesized internal double bond-containing polyvinylidene fluoride copolymer as a matrix and the functional crosslinker molecules as a crosslinking unit.

Description

Technical field [0001] The invention relates to a dielectric elastomer material, in particular to a cross-linked fluoropolymer-based dielectric elastomer composite material and a preparation method thereof. Background technique [0002] New high-performance electric drive materials can convert electrical energy into mechanical energy, and have broad application prospects in the fields of intelligent drive and biomedicine. Compared with piezoelectric ceramics and memory alloys, electroactive polymers have the advantages of low cost and easy structure control, which has attracted special attention. [0003] Dielectric elastomer is an elastomer material with a high dielectric constant (K). After coating electrodes on the upper and lower surfaces of the dielectric elastomer film and applying an external electric field, about 10%-40% of the deformation will occur to change its shape or Volume, this process is accompanied by the generation of stress and strain, thereby converting electr...

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Problems solved by technology

Generally, the K value of the composite material can be increased by adding inorganic high-dielectric ceramics to the polymer matrix, but since the elastic modulus of the composite material will also increase at the same time, the increase in driving deformation is not obvious; secondly, by adding organic conductors The K value of the composite material is greatly improved, but the increase of the conductivity makes the E of the composite material b Greatly reduced, while the leakage conduction loss increases, resulting in an increase in deformation is not obvious

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