標題: | Kinetics for the growth of rigid amorphous fraction in cyclic olefin copolymers (COC) |
作者: | Chu, PPJ Huang, WJ Chang, FC 應用化學系 Department of Applied Chemistry |
關鍵字: | densification;kinetics;cyclic olefin copolymers |
公開日期: | 1-三月-2001 |
摘要: | Both linear William-Watts (WW) and non-linear Narayanaswamy-William-Watts (NWW) stretch relaxation satisfactorily described the time dependent rigid amorphous phase growth kinetic. The model is tested upon the completely amorphous cyclic olefin copolymers (COC, polynorbornene/polyethylene copolymer), where a large T-g variation is detected with annealing. Increase of the rigid amorphous fraction as reflected in the increase of T-g, is attributed to the growth of short range ordered phase due to the rigidity of the norbornene chain segment. The analysis shows the growth kinetic (represented by the retardation time, and the stretch exponent) that depends not only on the norbornene (NB) content but also on the NE microblock structure. The kinetics for the growth of the rigid amorphous domains follows a stretched exponential expression, similar to that given for polymer crystallization and physical aging. (C) 2000 Elsevier Science Ltd. All rights reserved. |
URI: | http://hdl.handle.net/11536/29796 |
ISSN: | 0032-3861 |
期刊: | POLYMER |
Volume: | 42 |
Issue: | 5 |
起始頁: | 2185 |
結束頁: | 2191 |
顯示於類別: | 期刊論文 |