| Restudy of the unusual phase behavior of the mesogen-jacketed liquid crystal polymers |
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| 作者姓名： | ZHAO Yongfeng FAN Xinghe CHEN Xiaofang WAN Xinhua & ZHOU Qifeng Key Laboratory of Polymer Chemistry and Physics of Ministry of Education College of Chemistry Peking University Beijing China Correspondence should be addressed to Fan Xinghe & Zhou Qifeng |
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| 作者单位： | ZHAO Yongfeng，FAN Xinghe，CHEN Xiaofang，WAN Xinhua & ZHOU Qifeng Key Laboratory of Polymer Chemistry and Physics of Ministry of Education，College of Chemistry，Peking University，Beijing 100871，China Correspondence should be addressed to Fan Xinghe & Zhou Qifeng |
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| 摘 要： | 1 Introduction Liquid crystals (LC) are a state of order between crystals and liquids. They have imperfect long range orders of orientation and position. Thus, they can be fluid like a liquid and they can have anisotropic prop-erties like crystals. For th…
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| 收稿时间： | 13 June 2005 |
| 修稿时间： | 14 September 2005 |
Restudy of the unusual phase behavior of the mesogen-jacketed liquid crystal polymers |
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| ZHAO Yongfeng,FAN Xinghe,CHEN Xiaofang,WAN Xinhua & ZHOU Qifeng Key Laboratory of Polymer Chemistry and Physics of Ministry of Education,College of Chemistry,Peking University,Beijing ,China Correspondence should be addressed to Fan Xinghe & Zhou Qifeng.Restudy of the unusual phase behavior of the mesogen-jacketed liquid crystal polymers[J].Science in China(Chemistry),2006,49(2):116-125. |
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| Authors: | ZHAO Yongfeng FAN Xinghe CHEN Xiaofang WAN Xinhua ZHOU Qifeng |
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| Institution: | Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China |
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| Abstract: | A series of poly{2,5-bis(4-butoxyphenyl)-oxycarbonyl]styrenes} (PBPCS) with low mo-lecular weight distribution was synthesized by atom transfer radical polymerization (ATRP). The me-somorphic properties were investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and rheometer. PBPCS showed the phase transition from isotropic into liquid crystal (LC) phase, and the LC phase formed at high temperature and disappeared in the subsequent cooling procedure. Using the WAXD fiber pattern, the phase structure of the PBPCS at higher tem-perature showed hexagonal columnar nematic phase. Experimental results demonstrated that the driving force of the entropy is an important factor during the unusual LC phase formation of PBPCS. |
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| Keywords: | mesogen-jacketed liquid crystal polymers rheology hexagonal columnar nematic phase |
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