Mesogen-Jacketed Liquid Crystalline Polymers with a Polynorbornene Main Chain: Green Synthesis and Phase Behaviors
Mesogen-Jacketed Liquid Crystalline Polymers with a Polynorbornene Main Chain: Green Synthesis and Phase Behaviors
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具有聚降冰片烯主链的介晶包覆液晶聚合物：绿色合成和相行为
DOI：
10.1021/ma500606e
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发表时间：
2014
期刊：
影响因子：
5.5
通讯作者：
Zhou Qi-Feng
中科院分区：
文献类型：
--
作者：
Zhu Yu-Feng;Zhang Zhen-Yu;Zhang Qi-Kai;Hou Ping-Ping;Hao De-Zhao;Qiao Yang-Yang;Shen Zhihao;Fan Xing-He;Zhou Qi-Feng
我们通过开环歧化聚合合成了一系列具有聚降冰片烯主链的MJLCPs，PNbnPT(n=8，10，12，14，16，18，侧链烷基尾数)，并研究了它们的相行为。通过关键中间体N-(2，5-dicarboxylphenyl)-cis-5-norbornene-exo-2，3-dicarboximide.以令人满意的产率轻松合成了这些单体差示扫描量热法、偏光显微镜和广角X射线衍射仪的结果表明，PNbnPT的相行为强烈依赖于烷基尾长。具有较短烷基尾数的聚合物PNb8PT和PNb10PT在降解前的整个温度范围内是无定形的。随烷基尾长度的增加，PNbnPTs(n=12、14、16、18)向近晶A相发展，有序度随烷基尾长度的增加而增大。在本工作中，主链为聚降冰片烯的MJLCPs的合成路线比传统的合成路线更稳健、更环保。
We synthesized a new series of MJLCPs with a polynorbornene main chain, PNbnPT (n = 8, 10, 12, 14, 16, 18, which is the number of carbons in the side-chain alkyl tails), through ring-opening metathesis polymerization and investigated their phase behaviors. The monomers were facilely synthesized in satisfactory yields through a key intermediate, N-(2,5-dicarboxylphenyl)-cis-5-norbornene-exo-2,3-dicarboximide. Differential scanning calorimetry, polarized light microscopy, and wide-angle X-ray diffraction results demonstrate that the phase behavior of PNbnPT is strongly dependent on the alkyl-tail length. Polymers with relatively short alkyl tails, PNb8PT and PNb10PT, are amorphous in the whole temperature range before degradation. When the alkyl-tail length increases, PNbnPTs (n = 12, 14, 16, 18) develop into the smectic A phase, and the degree of order increases with increasing alkyl-tail length. The synthetic pathway for MJLCPs with a polynorbornene main chain in this work is more robust and greener than ...