Correlation between thermal diffusion and solvent self-diffusion in semidilute and concentrated polymer solutions.
Correlation between thermal diffusion and solvent self-diffusion in semidilute and concentrated polymer solutions.
复制标题
半稀和浓聚合物溶液中热扩散与溶剂自扩散之间的相关性。
DOI：
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发表时间：
2007
影响因子：
4.4
通讯作者：
W. Köhler
中科院分区：
文献类型：
--
作者：
J. Rauch;M. Hartung;A. Privalov;W. Köhler
我们测量了半稀至浓聚合物溶液中的热扩散系数DT和溶剂自扩散系数Dss。使用了不同玻璃化转变温度的溶质和不同溶剂质量的溶剂。所研究的体系有：聚二甲基硅氧烷在甲苯中、三苯乙烯在甲苯中、聚苯乙烯在甲苯中、聚苯乙烯在四氢呋喃中、聚苯乙烯在苯中、聚苯乙烯在环己烷中。热扩散数据与我们的数据和文献中溶剂自扩散系数的数据进行了比较。在所有体系中，DT的浓度依赖关系与Dss的浓度依赖关系密切相似，Dss可以被视为一个聚合物段长度尺度上摩擦的局部探针。这就确定了局部摩擦是决定DT的浓度依赖性的主要参数。相比之下，溶剂质量对DT没有影响。
We have performed measurements of thermal diffusion coefficients DT and solvent self-diffusion coefficients Dss in semidilute to concentrated polymer solutions. Solutes of different glass transition temperatures and solvents of different solvent qualities have been used. The investigated systems are in detail: poly(dimethyl-siloxane) in toluene, tristyrene in toluene, polystyrene in toluene, polystyrene in tetrahydrofuran, polystyrene in benzene, and polystyrene in cyclohexane. The thermal diffusion data are compared to our data and literature data for solvent self-diffusion coefficients. In all systems the concentration dependence of DT closely parallels the one of Dss which may be viewed as a local probe for friction on a length scale of the size of one polymer segment. This identifies local friction as the dominating parameter determining the concentration dependence of DT. Solvent quality, in contrast, has no influence on DT.
稀聚合物溶液中的索雷效应：链长、链刚度和溶剂质量的影响
DOI：
10.1063/1.2356469
发表时间：
2006
期刊：
The Journal of chemical physics
影响因子：
--
作者：
M. Zhang;F. Müller-Plathe
通讯作者：
F. Müller-Plathe