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研究了线性聚苯乙烯链在稀和半稀的θ溶液中平动扩散系数（D）和均方旋转半径（Rg）的浓度依赖性．在θ条件下，Rg无浓度依赖性，而D的浓度依赖性可由Fixman软球模型理论描述．
The concentration dependence of the translational diffusion coefficient (D) and the mean square radius of gyration (Rg) of a linear polystyrene chain in dilute and semi-dilute θ solutions was investigated. Rg has no concentration dependence at θ, whereas the concentration dependence of D can be described by the Fixman softball model theory.