|
|||||
|
|
Degradation induced variation of LC transition of poly(n-undecyl isocyanate) |
|
| Authors: | Bi-Zen Hsieh Hung-Yi Chuang Liang Chao Ying-Jie Huang Po-Hao Tseng Tar-Hwa Hsieh Yu-Kai Han Ko-Shan Ho |
| Affiliation: | aDepartment of Chemical and Materials Engineering, National Kaohsiung University of Applied Sciences, 415 Chien-Kuo Road, San-Ming District, Kaohsiung 80778, Taiwan bCenter for General Education, Technology and Science Institute of Northern Taiwan, Peito, Taipei 11202, Taiwan cInstitute of Nanotechnology, National Chiao Tung University, 1001, Ta Hsueh Road, Hsinchu, Taiwan dMing-Dao High School, 497, Section 1, Chung-San Road, Wu-Zi County, Taichung, Taiwan |
| Abstract: | 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 °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. |
| Keywords: | Liquid crystal transition Poly(n-undecyl isocyanate) Degradation Trimer |
| 本文献已被 ScienceDirect 等数据库收录！ | |