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Piezoelectric relaxations in homopolymers and copolymers of γ-Benzyl-L-glutamate and L-Leueine

1973; Taylor & Francis; Volume: 8; Issue: 3-4 Linguagem: Inglês

10.1080/00222347308201633

1525-609X

Eiichi Fukada, T. Furukawa, Eric Baer, Anne Hiltner, James M. Anderson,

Advanced Chemical Sensor Technologies

Abstract The temperature dependence of the piezoelectric stress-constant, the piezoelectric strain-constant, and the Young's elastic constant is simultaneously determined for homopolymers and copolymers of γ-benzyl-L-glutamate [Glu(OBz)] and L-leucine (Leu). With the rise of temperature, the piezoelectric constants first increase due to the elastic relaxation in the Leu side chains (about −150°C) and the Glu(OBz) side chains (about −10°C), and then decrease due to the dielectric relaxation in the Glu(OBz) side chains. Higher piezoelectric constants are observed for the copolymers at low temperatures. This suggests that the shear-induced internal strain of the peptide dipoles is enhanced by heterogenity in the structure of side chains.