On the structure and the chain conformation of side-chain liquid crystal polymers
On the structure and the chain conformation of side-chain liquid crystal polymers
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侧链液晶聚合物的结构和链构象
DOI：
10.1080/02678299508036602
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
J. Cotton
中科院分区：
文献类型：
--
作者：
L. Noirez;P. Keller;J. Cotton
用中子散射法研究了一系列侧链液晶聚合物的主链各向异性和中间相结构。主链构象通过小角中子散射与氘代主链的含氢聚合物的混合物获得。平行于磁场的回转半径的分量，R和垂直于磁场的回转半径的分量，R被确定为温度的函数，对于双晶相和近晶相。它示出的聚合物主链在两个阶段中变形。当聚合物仅表现出非晶相时，其采用长链构象，其中平均主链方向或多或少平行于对齐的介晶基团。在从近晶相转变为近晶相时，近晶相中的骨架呈现略微扁球形。这种扁球形的趋势是由于近晶波动，这总是存在于这样的非晶相。扁圆形背部的外向度...
Abstract Backbone anisotropy and the structure of the mesophases of a series of side-chain liquid crystal polymers have been studied in the bulk by neutron scattering. The backbone conformation is obtained by small-angle neutron scattering on mixtures of hydrogenous polymers with deuteriated backbones. The components of the radius of gyration parallel, R ⊥ and perpendicular, R ∥ to the magnetic field are determined as a function of temperature for both the nematic phase and the smectic phase. It is shown that the polymer backbone is deformed in both phases. When the polymer exhibits only a nematic phase, it adopts a prolate conformation, where the average backbone direction is more or less parallel to the aligned mesogenic groups. Upon transition from the smectic phase to a nematic phase, the backbone in the nematic phase assumes a slightly oblate shape. This tendency towards oblate shape is due to the smectic fluctuations which are always present in such nematic phases. The exentricity of the oblate back...