| Autor: |
Chi, Zhenguo, Cheng, Dan, Pan, Xinwei, Fan, Zhongyong, Bu, Haishan, Zheng, Yun, Yang, Hu, Cheng, Rongshi |
| Předmět: |
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| Zdroj: |
Journal of Macromolecular Science: Physics; Mar/Apr2006, Vol. 45 Issue 2, p325-334, 10p, 1 Black and White Photograph, 4 Diagrams, 2 Graphs |
| Abstrakt: |
The crystal morphology of a thermotropic liquid crystalline polyesterimide, derived from N, N'-hexane-1,6-diylbis(trimellitimides), 4,4'-dihydroxybenzophenone and p -hydroxybenzoic acid, was investigated by means of polarized light microscopy (PLM) with a hot stage and scanning electron microscopy (SEM). The PLM observation indicates a series of phase transitions in the polyesterimide: with increasing temperature, the transformation from the amorphous state to nematic was observed at 264°C, followed by the conversion of nematic to isotropic melt at 290°C; crystallization in the isotropic phase occurred when the sample was maintained at 290°C on a glass substrate (only) for extended time. Very large and perfect Hedgehog spherulites were grown at 290°C with a fast growth rate. The SEM observation provided information on branching in crystals and spherulites impingement. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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