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《ACTA POLYMERICA SINICA》 1999-04
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STUDIES ON LYOTROPIC LIQUID CRYSTALLINE \=BEHAVIOR OF CHITIN

DONG Yanming, WANG Jianwei, LIU Huangnan, LI Zhiqiang,\=YUAN Qing, MEI Xuefeng, WU Zhifu\= (Department of Materials Science,Xiamen University,Xiamen\ 361005)  
The lyotropic liquid crystalline behavior of chitin is first reported.The results showed that the critical concentration decreased evidently,the average pitch of the helix on cholesteric phase decreased,but the average area of liquid crystalline ordered domain increased,as the molecular weight of chitin increased.The critical concentrations(W/W) in dichloroacetic acid were 0005,0015,0035 and 0050 respectively for chitin with the molecular weight 284106,147106,94105 and 53105 prepared from different sources.According to theoretical analysis,the chitin has a rigid chain as polypeptides.The extremely low critical concentration of chitin will benefit the process of chitin in liquid crystalline phase such as liquid crystalline solution spinning.In two phase co\|existed concentration region of chitin with all molecular weight,no droplet texture but liquid crystalline domains with irregular shape appeared.\=
【Fund】: 中国科学院纤维素开放研究实验室资助
【CateGory Index】: O636.9
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