TY - GEN
T1 - Effect of crystallinity on electrical conduction characteristics of poly-L-lactic acid
AU - Kato, F.
AU - Omori, S.
AU - Matsushita, M.
AU - Ohki, Y.
PY - 2006/12/1
Y1 - 2006/12/1
N2 - Effect of crystallinity change on electrical conduction characteristics of poly-L-lactic acid was studied experimentally. The crystallinity was changed by thermal annealing. The lower crystallinity samples have more remaining charge than the higher crystallinity samples. Moreover, at 80 °C that is above their glass transition temperatures (Tg: 55-60 °C), the conductivity is much higher in the lower crystallinity sample than in the higher crystallinity sample. The low crystallinity sample shows two thermally stimulated current (TSC) peaks - one around Tg and the other at a temperature about 20 °C higher than Tg, while the higher crystallinity sample shows only the lower-temperature TSC peak. The TSC peak around Tg is attributable to the micro-Brownian motion that enables orientation of dipoles having the direction perpendicular to the polymer main chains, while the higher-temperature TSC peak seems attributable to the orientation and magnitude change of the end-to-end vector in the polymer main chain.
AB - Effect of crystallinity change on electrical conduction characteristics of poly-L-lactic acid was studied experimentally. The crystallinity was changed by thermal annealing. The lower crystallinity samples have more remaining charge than the higher crystallinity samples. Moreover, at 80 °C that is above their glass transition temperatures (Tg: 55-60 °C), the conductivity is much higher in the lower crystallinity sample than in the higher crystallinity sample. The low crystallinity sample shows two thermally stimulated current (TSC) peaks - one around Tg and the other at a temperature about 20 °C higher than Tg, while the higher crystallinity sample shows only the lower-temperature TSC peak. The TSC peak around Tg is attributable to the micro-Brownian motion that enables orientation of dipoles having the direction perpendicular to the polymer main chains, while the higher-temperature TSC peak seems attributable to the orientation and magnitude change of the end-to-end vector in the polymer main chain.
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U2 - 10.1109/CEIDP.2006.312051
DO - 10.1109/CEIDP.2006.312051
M3 - Conference contribution
AN - SCOPUS:50549096244
SN - 1424405475
SN - 9781424405473
T3 - Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
SP - 15
EP - 18
BT - 2006 Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
T2 - 2006 Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
Y2 - 15 October 2006 through 18 October 2006
ER -