Viscoelastic Properties of Comb-Shaped Polystyrenes
Viscoelastic Properties of Comb-Shaped Polystyrenes
复制标题
梳形聚苯乙烯的粘弹性能
DOI：
10.1021/ma60013a013
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发表时间：
1970
期刊：
影响因子：
5.5
通讯作者：
M. Nagasawa
中科院分区：
文献类型：
--
作者：
Teruo Fujimoto;H. Narukawa;M. Nagasawa
用阴离子聚合法制备了不同支链数和不同分支分子量的梳形聚苯乙烯。将样品分级，并通过渗透压和光散射法进行表征。在不同温度下观察样品膜的应力松弛，并根据时间-温度叠加原理通过移动曲线构建主曲线。从主曲线计算稳态流动粘度、稳态顺应性和其他流变参数。根据Bueche和Graessley的理论讨论了这些流变参数的分子量依赖性和分支密度依赖性。
Comb-shaped polystyrenes having variousnumbers of branches and various molecular weights of a branch were prepared by an anionic polymerization method. Thesamples were fractionated, and characterized by osmotic pressure and light-scattering methods. Stress relaxation of the sample films was observed at various temperatures and the master curve was constructed by shifting the curves according to the time-temperature superposition principle. The steady-flow viscosity, the steady-state compliance, and other rheological parameters were calculated from the master curves. The molecular weight dependence and the branch density dependence of those rheological parameters were discussed based on the theories of Bueche and Graessley.