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用激光光散射和粘度法研究了一系列窄分子量分布的新的手性甲壳型液晶聚合物P1～P6的溶液行为及其链刚性.研究发现四氢呋喃是聚合物P1～P6的良溶剂.在四氢呋喃溶液中,聚合物P1～P6的特性粘数[η]和均方根旋转半径z12对重均分子量Mw的依赖关系分别是[η]=(2.75±0.05)×10-3Mw0.78±0.02和z12=(1.53±0.04)×10-2Mw0.60±0.01.按照YamakawaFujiiYoshizaki蠕虫状圆筒模型的粘度理论和BohdaneckyBushin表达式,求得聚合物的单位围长摩尔质量ML=(29.8±1.0)×102nm,构象保持长度q=(15.4±3.0)nm.q和MHS方程指数α的值说明这类在结构上属于侧链型液晶高分子的聚合物在良溶剂四氢呋喃中呈现比较伸展的刚性链构象,其链刚性与半刚性主链液晶高分子的相似.
The behavior and chain rigidity of a series of new chiral shell-type liquid crystal polymers P1 ~ P6 with narrow molecular weight distribution were investigated by laser light scattering and viscosity method. It was found that tetrahydrofuran was a good solvent for polymers P1 ~ P6. The dependence of the intrinsic viscosity [η] and root mean square radius of gyration z12 of the polymers P1 to P6 on the weight average molecular weight Mw in the solution are respectively [η] = (2.75 ± 0.05) × 10 -3 Mw 0.78 ± 0.02 and z12 = (1.53 ± 0.04) × 10-2 Mw0.60 ± 0.01 According to the viscosity theory and the Bohdanecky Bushin expression of the worm-shaped cylinder model of Yamakawa Fujii Yoshizaki, the perimeter length of the polymer was determined as ML = ( 29.8 ± 1.0) × 102nm, the conformational retention length q = (15.4 ± 3.0) nm.q and the value of the MHS equation index α indicate that polymers of this type that are structurally side-chain-type liquid crystalline polymers are present in the good solvent tetrahydrofuran Stretched rigid chain conformation, its chain rigidity and semi-rigid main chain liquid crystal polymer is similar.