聚合物笼动力学中的非高斯效应
Non-gaussian effects in the cage dynamics of polymers
摘要：
在一个模型聚合物体系中研究了快笼动力学与结构弛豫之间的相关性。结果表明，当温度、密度、链长和单体-单体相互作用势改变时，由Debye-Waller因子表示的笼振动振幅和弛豫时间$τ_α$坍缩在一条具有简单解析形式的普适曲线上.对于具有相同均方位移、中间散射函数和非高斯参数的$τ_α$重合的物理态，在从弹道机制到链连接性驱动的Rouse动力学开始的宽时间窗内观察到了中间散射函数和非高斯参数。非高斯效应的作用进行了讨论。
英文摘要：
The correlation between the fast cage dynamics and structural relaxation is investigated in a model polymer system. It is shown that the cage vibration amplitude, as expressed by the Debye-Waller factor, and the relaxation time $τ_α$ collapse on a single universal curve with a simple analytic form when the temperature, the density, the chain length and the monomer-monomer interaction potential are changed. For the physical states with the same $τ_α$ coincidence of the mean-square displacement, the intermediate scattering function and the non-Gaussian parameter is observed in a wide time window spanning from the ballistic regime to the onset of the Rouse dynamics driven by the chain connectivity. The role of the non-Gaussian effects is discussed.
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