Piezoelectpic Properties and Temperature Stability of Poly (Vinylidene Flouride-Triflouroethylene) Copolymers

Sixth IEEE International Symposium on Applications of Ferroelectrics Pub Date : 1986-06-08 DOI:10.1109/ISAF.1986.201205

G. Stack, E. Ting

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Abstract

Abstract : Piezoelectric measurements were made on several copolymers of vinylidene fluoride and trifluoroethylene having a vinylidene fluoride concentration in the range of 65 to 75%. The hydrostatic g constant showed only a slight dependence on pressure, and pressures up to 35 MPa caused no apparent loss of the piezoelectric activity. A significant increase in the value of the hydrostatic g constant occurred with an increase in temperature. Anomalous results obtained upon cooling below room temperature may be attributed to the glass transition temperature of the trifluoroethylene comonomer. Temperature aging studies were performed at high temperatures using films of these copolymers. A significant loss of piezoelectric activity occurred after long time exposure. Isothermal studies at various aging temperatures revealed that this decay continued over a long time span. The aging behaviour characteristically followed a linear dependence on the logarithm of aging time. Keywords: Piezoelectric measurements; Vinylidene fluoride copolymers; Temperature stability.

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聚偏氟乙烯-三氟乙烯共聚物的压电性能和温度稳定性

摘要:对偏氟乙烯浓度在65 ~ 75%范围内的偏氟乙烯与三氟乙烯共聚物进行了压电测量。静压g常数对压力的依赖性较弱，当压力达到35 MPa时，压电活性没有明显下降。随着温度的升高，流体静力g常数的值显著增加。在室温以下冷却时获得的异常结果可归因于三氟乙烯共聚物的玻璃化转变温度。使用这些共聚物薄膜在高温下进行了温度老化研究。长时间暴露后，压电活性显著丧失。在不同老化温度下的等温研究表明，这种衰变持续了很长一段时间。老化行为与老化时间的对数呈线性关系。关键词:压电测量;偏氟乙烯共聚物;温度稳定。

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Sixth IEEE International Symposium on Applications of Ferroelectrics

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