将两种液晶单体4-联苯二酚基-4′-（2-乙基己酰基）-4-烯丙氧基苯甲酸酯(M1)和4-烯丙氧基苯甲酰氧基-4′-甲氧基苯(M2)接枝到聚硅氧烷链上，用IRS、DSC、TGA、POM、SAXS和WAXD等对所得样品进行了测定。结果表明，含有两种介晶基元的聚硅氧烷类液晶，具有较宽的中介区间（240～255℃），比只含一种介晶基元的聚硅氧烷类液晶中介相拓宽约170℃左右，且低于室温具有液晶相(-18～8.7℃)，热分解温度在300℃以上，属于近晶织构。
A series of side-chain liquid crystalline polymethylsiloxanepolymers containing different mole ratio of mesogenic monomers 4-(4-allyloxybenzoxy)-4′-(2-ethyl-hexanoyloxy) diphenyl (M1) and 4-allyloxybenzoxy-4′-methoxybenzene (M2) were prepared by graft polymerization. The structure and properties of the ploymers were characterized by IRS, POM, SAXS, WAXD, DSC and TGA. All of the samples PⅠ-PⅤ exhibited over a broad temperature range of liquid crystals (240～255℃), the temperature of mesogenic range increased about 170℃ comparing the polymers only containing M1 or M2. The Tg of P0-PⅦ were lower than room temperature (from-18℃ to 8.7℃), the temperatures of decomposion were higher than 300℃. All of the samples were smectic mesogenic textures.
参考文献
| [1] | Zhang B Y, Guo S M, Shao B. Synthesis and characterization of liquid crystalline ionomers with polymethylhydrosiloxane main-chain-and side-chain-containing sulfonic acid groups [J]. J.Appl.Polym.Sci., 1998, 68:1555-1561. |
| [2] | UJIIE Seiji, IIMURA Kazuyoshi. Ion complex type of novel chiral smectic C* liquid-crystal having chiral hydrogentartrate counterion [J]. Chemistry Letters, 1994, 1:17-20. |
| [3] | Gohy J F, Vanhoorne P, J′ero′me R. Synthesis and preliminary characterization of model liquid crystalline ionomers [J]. Macromolecules,1996, 29(10):3376-3383. |
| [4] | 周其凤， 王新久. 液晶高分子 [M]. 北京： 科学出版社， 1994. |
| [5] | Heino Finklemann, Hans J Kock. Investigations on liquid crystalline polysiloxanes 3a) liquid crystalline elastomers-a new type of liquid crystalline materialb) [J]. Makromol.Chem. Rapid Commun., 1981, 2:317-322. |
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