標題: Degradation induced variation of LC transition of poly(n-undecyl isocyanate)
作者: Hsieh, Bi-Zen
Chuang, Hung-Yi
Chao, Liang
Huang, Ying-Jie
Tseng, Po-Hao
Hsieh, Tar-Hwa
Han, Yu-Kai
Ho, Ko-Shan
材料科學與工程學系奈米科技碩博班
Graduate Program of Nanotechnology , Department of Materials Science and Engineering
關鍵字: liquid crystal transition;poly(n-undecyl isocyanate);degradation;trimer
公開日期: 1-May-2008
摘要: The first-order thermal transitions including side-chain melting, crystal-LC, biphasic chimney-like, and isotropic transitions of poly(n-undecyl isocyanate) (PUDIC) were investigated by varying its thermal history. After annealing at 140 degrees C for different periods of time, it leads to different degrees of backbiting degradation into n-undecyl isocyanurate trimer which behaves as a solvent for the rest non-degraded/rigid PUDIC to change into a lyotropic LC from thermotropic transition. Based on the degree of degradation, various amounts of trimers are present and the PUDIC demonstrates different types of thermal transitions found in DSC thermograms due to the variation of the non-degraded PUDIC concentration in solvent trimers. Finally, a phase diagram includes all types of crystallines, LC, and isotropic regions can be drawn according to the DSC thermograms. (C) 2008 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.polymdegradstab.2008.01.032
http://hdl.handle.net/11536/9424
ISSN: 0141-3910
DOI: 10.1016/j.polymdegradstab.2008.01.032
期刊: POLYMER DEGRADATION AND STABILITY
Volume: 93
Issue: 5
起始頁: 983
結束頁: 989
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