Solvent size effect on the static and dynamic properties of polymer chains in athermal solvents

Solvent size effect on the static and dynamic properties of polymer chains in athermal solvents
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溶剂尺寸对非热溶剂中聚合物链静态和动态性能的影响

DOI:
10.1016/j.polymer.2009.09.010
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发表时间:
2009-10
期刊:
影响因子:
4.6
通讯作者:
An, Lijia
An, Lijia
中科院分区:
化学2区
文献类型:
--
作者:
Li, Hongfei;Fu, Cuiliu;Zhen, Tong;Sun, Zhaoyan;Ouyang, Wenze;An, Lijia

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用分子动力学方法研究了高分子链在不同尺寸的非热溶剂中的静态和动态性质。随着溶剂尺寸的增加,聚合物的回转半径和扩散系数快速衰减,直到达到临界溶剂尺寸。对于聚合物扩散系数,这种衰减仅取决于溶剂的大小;而对于聚合物的回转半径,这种衰减取决于溶剂的大小和聚合物的长度。溶剂尺寸的增加也使聚合物趋向于更厚的椭球体,直到达到临界溶剂尺寸。聚合物的静态标度指数也显示了溶剂尺寸依赖性。此外,根据聚合物的动态结构因子,确定了四个区域,其中聚合物显示出不同的动态行为。
The static and dynamic properties of polymer chains in athermal solvents with different sizes are studied by molecular dynamics method. With increasing solvent size, the radius of gyration and the diffusion coefficient of the polymer decay fast until a critical solvent size is reached. For the polymer diffusion coefficients, this decay only depends on the solvent size; while for the radius of gyration of polymers, this decay depends on both solvent size and the length of the polymers. The increase of solvent size also makes the polymer tend to be thicker ellipsoid until a critical solvent size is reached. The static scaling exponent of the polymer also shows the solvent size dependence. Moreover, four regions are identified where the polymers show different dynamic behaviors according to the dynamic structure factors of the polymer.
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发表时间: 1995
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