Vf2 trfe



Keywords: vf2 trfe
Description: Curie transition study in a copolymer of vinylidene fluoride and trifluoroethylene by mechanical spectrometry Received 10 March 1989. Revised 11 November 1989. Accepted 10 May 1990. Available

Curie transition study in a copolymer of vinylidene fluoride and trifluoroethylene by mechanical spectrometry

Received 10 March 1989. Revised 11 November 1989. Accepted 10 May 1990. Available online 22 April 2003.

Vinylidene fluoride/trifluoroethylene statistical copolymer is a ferroelectric system with one observable Curie transition (in the case of composition). Data obtained by mechanical spectrometry show that the loss angle varies weakly with temperature in the transition range. We also observe a large decrease in modulus in this temperature range. These results are discussed in terms of a mixture of two crystalline phases in the transition range. The coexistence of these phases (ferroelectric and paraelectric) around the Curie transition point leads to hysteresis characteristic of a first-order transition. The purpose of this paper is to characterize the material modulus from the mixture formula for a two-phase system in the range of the Curie transition. Complementary results from differential scanning calorimetry and dielectric spectrometry are in agreement with such a hypothesis.




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