Influence of alkoxy tail length and unbalanced mesogenic core on phase behavior of mesogen‐jacketed liquid crystalline polymers
Influence of alkoxy tail length and unbalanced mesogenic core on phase behavior of mesogen‐jacketed liquid crystalline polymers
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DOI：
10.1002/pola.23167
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发表时间：
2009-01
期刊：
影响因子：
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通讯作者：
Si Chen;Lanying Zhang;Longcheng Gao;Xiaofang Chen;Xinghe Fan;Zhihao Shen;Qifeng Zhou
中科院分区：
文献类型：
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作者：
Si Chen;Lanying Zhang;Longcheng Gao;Xiaofang Chen;Xinghe Fan;Zhihao Shen;Qifeng Zhou
当柔性末端取代基由丁氧基变为己氧基或更长的取代基时，首次报道了一种介源夹套液晶聚合物（MJLCP）的近晶C （SC）液晶相，其介源侧基不平衡地与主链结合而没有间隔。设计并通过自由基聚合成功合成了一系列mjlcp，聚[4,4 ' -双（4-烷氧苯基）-2-乙烯基联苯（羧基）]（nC2Vp， n为烷氧基上的碳数，n = 2、4、6、8、10和12）。用凝胶渗透色谱法表征了聚合物的分子量，用差示扫描量热法、偏振光显微镜实验和1D、2D广角x射线衍射研究了聚合物的液晶性质。与丁氧基类似物相比，具有不平衡介观核和较短柔性取代基（n = 2,4）的聚合物保持相同的近晶A （SA）相，而其他具有较长末端柔性取代基（n = 6,8,10和12）的聚合物可以发展成明确的SC相而不是SA相。©2008 Wiley期刊公司[J] .化学工程学报，2009,31 (4):557 - 557
When the flexible terminal substituent changes from butoxy to hexyloxy or longer, smectic C (SC) liquid crystalline phase was firstly reported to develop from a kind of mesogen-jacketed liquid crystalline polymer (MJLCP) whose mesogenic side groups are unbalancedly bonded to the main chain without spacers. A series of MJLCPs, poly[4,4′-bis(4-alkoxyphenyl)-2-vinylbiphenyl(carboxide)] (nC2Vp, n is the number of the carbons in the alkoxy groups, n = 2, 4, 6, 8, 10, and 12) were designed and synthesized successfully via free radical polymerization. The molecular weights of the polymers were characterized with gel permeation chromatography, and the liquid crystalline properties were investigated by differential scanning calorimetry, polarized light microscopy experiments, and 1D, 2D wide-angle X-ray diffraction. Comparing with the butoxy analog, the polymer with unbalanced mesogenic core and shorter flexible substituents (n = 2, 4) keeps the same smectic A (SA) phase, but other polymers with longer terminal flexible substituents (n = 6, 8, 10, and 12) can develop into a well-defined SC phase instead of SA phase. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 505–514, 2009