Influence of the spacer on the phase behaviors of side-chain liquid crystalline copolymers based on triphenylene discotic mesogen unit
Influence of the spacer on the phase behaviors of side-chain liquid crystalline copolymers based on triphenylene discotic mesogen unit
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间隔基对苯并菲盘状介晶单元侧链液晶共聚物相行为的影响
DOI：
10.1039/c6ra07083c
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发表时间：
2016-04
期刊：
影响因子：
3.9
通讯作者：
Zhang Hailiang
中科院分区：
文献类型：
--
作者：
Ban Jianfeng;Mu Luona;Chen Lin;Chen Shaojun;Zhang Hailiang
以两种苯并菲类液晶单体（MTS和MT 6S）为原料，以偶氮二异丁腈（AIBN）为引发剂，通过自由基聚合制备了一系列新型的二元共聚物聚{[3，6，7，10，11-五（己氧基）-2-氧代苯并菲]甲基丙烯酸酯-co-6-[3，6，7，10，11-五（己氧基）-2-氧代苯并菲]甲基丙烯酸己酯}（poly（MTSx-co-MT 6Sy））。由于类似的苯并菲单体，基于假定的类似反应性，预期共聚物的无规性质。用DSC、POM和1D WAXD研究了共聚物的相行为。结果表明，PMT 6S含量对共聚物的液晶相行为和相结构有显著影响。通过对PMTS和PMT 6S液晶结构的比较，发现间隔基的含量对液晶结构的形成有重要影响。PMTS形成了稳定的柱状晶相（ΦN），而PMT 6S表现出稳定的六方柱状晶相（ΦH）。共聚后，共聚物的玻璃化转变温度和从液晶相到各向同性相的相转变温度均随原料中PMT 6S摩尔分数的增加而降低。当PMT 6S摩尔含量低于75%时，可形成稳定的ΦN，其性质与PMTS相似。当PMT 6S摩尔含量大于80%时，样品呈现出与PMT 6S相似的对称性ΦH。通过共聚，人们可以更好地理解微观结构的相互关系以及Tp介晶有序性如何构成各种应用的关键基础。
Based on two analogous triphenylene liquid crystalline monomers (MTS and MT6S), a novel series of binary copolymers poly{[3,6,7,10,11-pentakis(hexyloxy)-2-oxytriphenylene]methacrylate-co-6-[3,6,7,10,11-pentakis(hexyloxy)-2-oxytriphenylene]hexyl methacrylate} (poly(MTSx-co-MT6Sy)) were prepared by free radical polymerization using AIBN as initiator. The random nature of the copolymers was expected on the basis of the assumed similar reactivities due to the analogous triphenylene monomers. The phase behaviors of copolymers were studied by DSC, POM and 1D WAXD. The results showed that the content of PMT6S has a significant effect on the liquid crystalline (LC) phase behaviors and phase structures of copolymers. The comparison between PMTS and PMT6S indicates that the content of the spacer was crucial to determine the LC structures. The PMTS formed a stable columnar nematic phase (ΦN) and the PMT6S exhibited a stable hexagonal columnar phase (ΦH). After copolymerization, the glass transition temperature and the phase transition temperature of the copolymers from the LC phase to isotropic phase both decreased with the molar fraction of PMT6S in the feed. The samples whose molar content of PMT6S was below 75% formed stable ΦN, similar to the property of PMTS. The samples whose molar content of PMT6S was above 80% presented the symmetry ΦH, similar to the property of PMT6S. Through copolymerization, one can better understand the interrelation of microstructures and how Tp mesogenic orders constitute the key basis for various applications.
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影响因子：
5.5
作者：
He-Lou Xie;Shao-Jie Wang;G. Zhong;Yi-Xin Liu;Hailiang Zhang;E. Chen
通讯作者：
He-Lou Xie;Shao-Jie Wang;G. Zhong;Yi-Xin Liu;Hailiang Zhang;E. Chen
侧链具有苯并菲盘状液晶介晶单元的介晶包覆液晶聚合物的合成及相行为
影响因子：
3.9
作者：
Ban Jianfeng;Chen Sheng;Zhang Hailiang
通讯作者：
Zhang Hailiang
DOI：
10.1002/marc.1993.030140602
发表时间：
1993-06
期刊：
Die Makromolekulare Chemie, Rapid Communications
影响因子：
--
作者：
M. Werth;H. Spiess
通讯作者：
M. Werth;H. Spiess
影响因子：
7.015
作者：
Luo, Chuanfu;Sommertt, Jens-Uwe
通讯作者：
Sommertt, Jens-Uwe
影响因子：
3.2
作者：
V. Percec;Chu-san Wang;Myongsoo Lee
通讯作者：
V. Percec;Chu-san Wang;Myongsoo Lee