Effect of Crystallinity on Electrical Conduction Characteristics of Poly(l-lactic acid)

概要

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The crystallinity of poly(l-lactic acid) was changed by thermal annealing and its effects on electrical conduction characteristics were studied. Low-crystallinity samples have a higher conductivity and a higher remaining charge quantity than high-crystallinity samples. The sample shows two thermally stimulated current (TSC) peaks at around $T_{\text{g}}$ and about 20 °C higher than $T_{\text{g}}$ when its crystallinity is low, while it shows only the former TSC peak when its crystallinity is high. The TSC peak at around $T_{\text{g}}$ is attributable to the micro-Brownian motion that enables the orientation of dipoles in a direction perpendicular to the polymer main chain, whereas the high-temperature peak is attributable to the orientation and magnitude change of the end-to-end vector in the polymer main chain.
2007-06-15