Vinylidene cyanide copolymers piezoelectricity

Y. S. Jo. M. Sakiirai. Y. Inoiie, R. Cbujo, S. Ihsaka. and S. h4iyau, Solveol-depeadeot coformatioos and piezoelectricity of the copolymer of vinylidene cyanide and vinyl acetate. Pofymer 28 1583 (1987). 

Investigations into alternative piezoelectric polymers, both semicrystalline and amorphous, continued into the 1980s, and two of the most significant discoveries are worth a brief mention. Of semicrystalline materials, the odd-membered polyamides (or nylons), particularly nylon-11, were found to exhibit reasonable piezoelectric activity, especially when mechanically oriented [9]. The highest piezoelectricity in an amorphous polymer was discovered in 1980 [10] in a copolymer of vinylidene cyanide and vinyl acetate. 

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