Synthesis of Liquid Crystalline Epoxy Oligomers: Effect of Molecular Weight on the Phase Behavior
Synthesis of Liquid Crystalline Epoxy Oligomers: Effect of Molecular Weight on the Phase Behavior
复制标题
液晶环氧低聚物的合成：分子量对相行为的影响
DOI：
10.1002/1521-3927(20010901)22:13
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
C. Carfagna
中科院分区：
文献类型：
--
作者：
Weichang Liu;C. Carfagna
合成了一系列以α-甲基二苯乙烯为液晶基元的不同分子量的环氧端基液晶低聚物，并用1HNMR和FT-IR、差示扫描量热法（DSC）、偏光显微镜（POM）和X射线衍射对其进行了表征。环氧氯丙烷和二元醇的初始配比对分子量的影响不显著，不足以从本质上改变齐聚物的热行为。通过端羟基和环氧基共聚得到了高分子量的齐聚物，并通过DSC、POM和X射线衍射证实了其液晶性。
A series of epoxy-terminated liquid crystalline oligomers with different molecular weights having α-methylstilbene as the mesogenic unit were synthesized and characterized by means of 1H NMR and FT-IR spectroscopy, differential scanning calorimetry (DSC), polarized-light optical microscopy (POM) and X-ray diffraction. The effect of the initial ratio between epichlorohydrin and diol on the molecular weight was not significant enough to change the thermal behavior of the oligomers essentially. The copolymerization of epoxy- and hydroxyl-terminated comonomers yielded high-molecular weight oligomer, whose enantiotropic liquid crystalline character was proved by means of DSC, POM and X-ray diffraction.