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首页> 外文期刊>Macromolecules >Rheo-optical study on dynamics of bottlebrush-like polymacromonomer consisting of polystyrene. II. side chain length dependence on dynamical stiffness of main chain
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Rheo-optical study on dynamics of bottlebrush-like polymacromonomer consisting of polystyrene. II. side chain length dependence on dynamical stiffness of main chain

机译：流变光学研究由聚苯乙烯组成的类似瓶刷的大分子单体的动力学。二。侧链长度对主链动力刚度的依赖性

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摘要

Dynamic birefringence and viscoelasticity measurements of bottlebrush-like polystyrene polymacromonomers having various branch (side chain) lengths were conducted over a wide frequency region covering from the glass-to-rubber transition zone to the flow zone in order to discuss effects of side chain length on dynamical stiffness of main polymer chain. Strain-induced birefringence at high frequencies was negative, similarly to linear polystyrenes, irrespective of side chain length, while birefringence in the flow zone strongly depended on side chain length. By using the modified stress-optical rule (MSOR), the complex modulus was decomposed into two components, main chain and branch components. With increasing the side chain length, the dynamical stiffness of main chain (number of repeating units per viscoelastic segment) first increased and then leveled off, suggesting that repulsive interaction between branches would be screened out over a certain branch length.
机译：在从玻璃到橡胶的过渡区到流动区的较宽频率范围内，对具有各种支链（侧链）长度的瓶状聚苯乙烯类大分子单体进行动态双折射和粘弹性测量，以讨论侧链长度对主聚合物链的动态刚度。应变诱导的双折射在高频率下为负值，类似于线性聚苯乙烯，与侧链长度无关，而流动区中的双折射强烈取决于侧链长度。通过使用修改的应力-光学规则（MSOR），复数模量被分解为两个部分，主链和分支部分。随着侧链长度的增加，主链的动态刚度（每个粘弹性链段的重复单元数）首先增加，然后趋于平稳，这表明在一定的分支长度上会筛选出分支之间的排斥相互作用。

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