New Combined Liquid Crystalline Polymers from Polyaddition of Biphenol Diglycidyl Ether and Trimeric Esters
New Combined Liquid Crystalline Polymers from Polyaddition of Biphenol Diglycidyl Ether and Trimeric Esters
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DOI：
10.1021/ma990348i
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发表时间：
1999-09
期刊：
影响因子：
5.5
通讯作者：
Bao-Quan Chen;and Atsushi Kameyama;T. Nishikubo
中科院分区：
文献类型：
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作者：
Bao-Quan Chen;and Atsushi Kameyama;T. Nishikubo
合成了六种具有联苯介晶基团和聚亚甲基间隔基的三聚体。以这些三聚体和联苯酚二缩水甘油醚（BPGE）为原料，以氯化季鏻为催化剂，通过加聚反应合成了一系列具有聚醚骨架的新型组合液晶聚合物（LCP）。使用差示扫描量热法 (DSC)、偏光光学显微镜 (POM) 和 X 射线衍射研究了柔性间隔基长度对所得三聚体和组合 LCP 的相变和介晶性的影响。具有1,3-亚丙基和1,4-亚丁基间隔基的三聚体不存在中间相，并且具有奇数间隔基1,5-亚戊基和1,7-亚庚基的三聚体是向列型的。相比之下，具有偶数间隔基的三聚体，1,6-己烯和1,10-癸烯，在非常窄的温度范围内呈近晶结构。所有组合的 LCP 均呈热致向列相，但由于侧链间隔基长度不同，结晶行为很复杂。组合 LCP ...
Six trimers with biphenyl mesogenic groups and polymethylene spacers were synthesized. From these trimers and biphenol diglycidyl ether (BPGE), a new series of combined liquid crystalline polymers (LCPs) with polyether backbone were synthesized by the polyaddition with quaternary phosphonium chloride as catalyst. The effects of flexible spacer length on the phase transition and mesomorphism of the resulting trimers and combined LCPs were studied using differential scanning calorimetry (DSC), polarizing optical microscopy (POM), and X-ray diffraction. The trimers with 1,3-propylene and 1,4-butylene spacers were absent of mesophase, and the trimers with odd-numbered spacers, 1,5-pentylene and 1,7-heptylene, were nematic. In contrast, the trimers with even-numbered spacers, 1,6-hexylene and 1,10-decylene, were smectic within very narrow temperature ranges. All the combined LCPs were thermotropically nematic, though the crystalline behavior was complex with varying side-chain spacer length. The combined LCPs ...