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	甲壳型液晶高分子的一种非寻常热致液晶行为; A NOVEL THERMOTROPIC BEHAVIOR OF A MESOGEN-JACKETED LIQUID CRYSTAL POLYMER
	于振宁 ; 宛新华 ; 涂慧琳 ; 陈小芳 ; 周其凤
	2003
关键词	甲壳型液晶高分子,热致性液晶,聚[2,5-双(4′-正己氧基苯氧羰基)苯乙烯] mesogen-jacketed liquid crystal polymers thermotropic liquid crystal poly {2, 5-bis [(4 &apos -hexyloxyphenyl) oxycarbonyl] styrene}
英文摘要	根据液晶相的稳定性,热致性液晶有双向性和单向性之分.前者在升温和降温过程中都能形成液晶,而后者只能在降温过程中形成液晶.原因是单向性液晶的液晶相不稳定,清亮点Ti低于熔点Tm.升温时,样品熔融后直接进入各向同性的熔体;降温时,由于结晶过程的过冷,冷结晶温度Tc低于Ti,样品先从各向同性态进入液晶态,然后才结晶.一般情况下,如果液晶化合物自身是非晶的,所形成的有序结构不会由于冷却而遭到破坏.; A mesogen-jacketed liquid crystal polymer, poly {2,5-bis[(4'-hexyloxyphenyl) oxycarbonyl]styrene} (PHPCS) with number-averaged molecular weight of 1.28 x 10(5) and polydispersity of 1.48 was prepared via 2, 2, 6,6-tetramethyl-piperidinyloxy mediated free radical polymerization. The thermotropic behavior was studied by a combination of differential scanning calorimetry, thermogravimetry, polarized optical microscope and wide-angle X-ray diffraction. PHPCS was not crystalline over the entire temperature region studied. On heating, PHPCS first became an isotropic melt at glass transition temperature (T-g) and then a mesophase at temperatures much higher than T-g. On subsequent cooling, the formed ordered phase disappeared above T-g Contrary to theoretical predictions and previous experimental observations, the transition from isotropic melt to liquid crystalline phase was an endothermic process and the order-disorder transition took place with concurrence of heat release.; 国家自然科学基金; 高等学校博士学科点专项科研项目; 高等学校优秀青年教师教学科研奖励计划; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000183620800020&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; SCI(E); 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 7; 3; 430-433
语种	中文
出处	SCI ; 万方 ; http://d.g.wanfangdata.com.cn/Periodical_gfzxb200303020.aspx
出版者	高分子学报
内容类型	其他
源URL	[http://hdl.handle.net/20.500.11897/80656]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	于振宁,宛新华,涂慧琳,等. 甲壳型液晶高分子的一种非寻常热致液晶行为, A NOVEL THERMOTROPIC BEHAVIOR OF A MESOGEN-JACKETED LIQUID CRYSTAL POLYMER. 2003-01-01.

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