高等学校化学学报

高等学校化学学报 ›› 1994, Vol. 15 ›› Issue (10): 1563.

• 论文 • 上一篇    下一篇

光致变色液晶高分子研究(Ⅳ)─含苯甲酸－4－甲氧基苯酯介晶基元和偶氮苯光色基元侧链共聚硅氧烷的液晶行为

张其震1, 王艳2, 侯建安3, 徐懋3   

  1. 1. 山东大学化学系, 济南, 250100;
    2. 山东大学环境科学中心, 济南, 250100;
    3. 中国科学院化学研究所, 北京
  • 收稿日期:1993-10-26 修回日期:1994-02-15 出版日期:1994-10-24 发布日期:1994-10-24
  • 通讯作者: 张其展,男,56岁,副教授.
  • 作者简介:张其展,男,56岁,副教授.
  • 基金资助:

    国家自然科学基金;中国科学院高分子物理联合开放实验室(化学所)资助

Studies on Photochromic Liquid Crystalline Polymers(Ⅳ)─Liquid Crystalline Behavior of Side-Chain Copolysiloxanes Cotaining 4-Methoxyphenyl Benzoate Mesogens and Azobenzene Photochromic Groups

ZHANG Qi-Zhen1, WANG Yan2, Hou Jian-An3, Xu Mao3   

  1. 1. Department of Chemistry, Shandong University, Jinan, 250100;
    2. Centre of Envirommental Sci.Shandong University, Jinan, 250100;
    3. Polymer Physics Laboratory, Institute of Chemistry, Academia Sinica, Beijing
  • Received:1993-10-26 Revised:1994-02-15 Online:1994-10-24 Published:1994-10-24

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摘要： 用热台偏光显微镜和DSC法研究了含苯甲酸-4-甲氧基苯酯介晶基元和偶氮苯光色基元侧链共聚硅氧烷(PSⅡ)的液晶性。将非介晶基元并入液晶均聚物PSⅡ-1,共聚物PSⅡ-2、PSⅡ-3的液晶态类型不变,PSⅡ-4仅存在近晶相,PSⅡ-5～8无双折射现象,保持共聚物液晶性的最低含介晶基元单体的极限摩尔含量为80%.在液晶共聚物中,非介晶基组分含量增加时,其Tm、ΔHm和ΔSm降低；非介晶组分在10mol%时,Ti、ΔHi和ΔSi具有最小值。

关键词: 热致液晶高分子, 侧链共聚硅氧烷, 苯甲酸－4－甲氧基苯酯, 近晶相

Abstract: The liquid crystalline properties of side-chain copolysiloxanes containing 4-methoxyphenyl benzoate mesogens and azobenzene photochromic groups were characterized by polarized microscopy with a hot stage(POM)and DSC.On incorporation of nonmesogenic units into polysiloxane PS Ⅱ-1 the type of mesophase did not chang for copolymers PS Ⅱ-2 and PS Ⅱ-3, but smectic texture is only preserved for copolymer PS Ⅱ-4.The mole fraction limit of mesogenic units needed for mesophase existence of copolysiloxanes of mesogenic monomers with monomers, which do not contain mesogenic fragments, is to be 80 mol%;In the composition region of mesophase existence the lowering of melting temperature is accompanied by the increasing of nonmesogenic component content of copolymers and their isotropic temperature, enthalpy and entropy pass through a minimum at 10 mol%of nonmesogenic units of PS Ⅱ-3, as shown in Fig, 3.

Key words: Thermotropic liquid crystalline polymers, Side-chain copolysiloxanes, 4-Methoxyphenyl benzoate, Smectic phase

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