Diffusion and thermal diffusion of semidilute to concentrated solutions of polystyrene in toluene in the vicinity of the glass transition -: art. no. 185901
Diffusion and thermal diffusion of semidilute to concentrated solutions of polystyrene in toluene in the vicinity of the glass transition -: art. no. 185901
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DOI：
10.1103/physrevlett.88.185901
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发表时间：
2002-05-06
影响因子：
8.6
通讯作者：
Köhler, W
中科院分区：
文献类型：
--
作者：
Rauch, J;Köhler, W
在聚苯乙烯/甲苯溶液中接近玻璃化转变导致在浓度高于0.2 g/cm（3）时集体扩散系数D和热扩散系数D-T急剧衰减。Soret系数S-T=D-T/D遵循从半稀释到浓缩的幂律缩放，并且不受与玻璃化转变相关的动力学减慢的影响。D和D-T都由相同的摩擦系数决定。将玻璃化转变点附近S-T随浓度变化的标度行为与共溶临界点附近S-T的发散进行了比较。
The approaching glass transition in polystyrene/toluene solutions leads to a sharp decay of both the collective diffusion coefficient D and the thermal diffusion coefficient D-T at concentrations above 0.2 g/cm(3) . The Soret coefficient S-T=D-T/D follows power-law scaling from semidilute to concentrated and is not influenced by the slowing down of the dynamics associated with the glass transition. Both D and D-T are governed by the same friction coefficient. The scaling behavior of S-T with concentration on approach of the glass transition is compared to the divergence of S-T near a consolute critical point.