Piezoelectric Poly-L-Lactic Acid Film Prepared by a New Method

概要

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The possibility has been indicated that polymers with helical chirality, such as poly-L-lactic acid (PLLA), show a large optical rotatory power $\rho$ (about 9600 deg/mm: J. Kobayashi et al., J. Appl. Phys. 77 (1995) 2957) or piezoelectric constant in their fiber axial direction (helical chain direction). To attempt the realization of a new optical or piezoelectric active polymer device, we fabricated the PLLA on a basal plate using end-grafted polymer technology. The structure of PLLA on a basal plate was observed by atomic force microscopy. As a result, we found that the PLLA on a basal plate with annealing grows into have a needle-like structure. The roughness of the aggregate PLLA on a basal plate is 12.5 nm. $\rho$ of the PLLA on a basal plate is about 80 deg/mm. This $\rho$ value is larger than that of the quartz crystal which is a very well-known crystal with high optical activity. We speculated, on the basis of Kobayashi et al.'s report, that the helical chain direction of the PLLA on a basal plate obtained in this study is not perpendicular to but has a fixed angle to the surface of the basal plate.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2003-09-15