Studies of cyclic and linear poly(dimethyl siloxanes): 9. Quasi-elastic light scattering and concentration dependences of diffusion coefficients
Studies of cyclic and linear poly(dimethyl siloxanes): 9. Quasi-elastic light scattering and concentration dependences of diffusion coefficients
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DOI：
10.1016/0032-3861(82)90150-1
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发表时间：
1982-06
期刊：
影响因子：
4.6
通讯作者：
C. Edwards;S. Bantle;W. Burchard;R. Stepto;J. A. Semlyen
中科院分区：
文献类型：
--
作者：
C. Edwards;S. Bantle;W. Burchard;R. Stepto;J. A. Semlyen
报道了线性聚二甲基硅氧烷（PDMS）和环聚二甲基硅氧烷（PDMS）在298K时在甲苯中的扩散系数(D)的浓度依赖性。使用了三个循环/线性对，摩尔质量在300到23 500 g mol−1之间。准弹性散射法测得的数值与经典边界扩展法测得的数值吻合较好。根据Pyun和Fixman的浓度依赖性分析表明，在298K时，溶质分子在甲苯中表现出最小的相互渗透。
The concentration dependences of the diffusion coefficients (D) of linear and cyclic poly(dimethyl siloxanes) (PDMS) in toluene at 298K are reported. Three cyclic/linear pairs of fractions with molar masses in the range 300 to 23 500 g mol−1were used. The values ofDobtained by quasielastic scattering were in good agreement with those measured by the classical boundary-spreading technique. Analysis of the concentration dependences in terms of the theory of Pyun and Fixman indicates that the solute molecules show a minimum of interpenetration in toluene at 298K.