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首页> 外文期刊>Macromolecules >Temperature and molecular weight dependence of mutual diffusion coefficient of cyclic polystyrene/cyclic deuterated polystyrene Bilayer films
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Temperature and molecular weight dependence of mutual diffusion coefficient of cyclic polystyrene/cyclic deuterated polystyrene Bilayer films

机译：环状聚苯乙烯/环状氘代聚苯乙烯双层薄膜相互扩散系数的温度和分子量依赖性

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Temperature and molecular weight dependence of diffusion behavior of cyclic polystyrenes/Cyclic Deuterated Polystyrene Bilayer Films with high purity by secondary ion mass spectroscopy (DSIMS). Monodisperse cyclic and linear polystyrenes (c-hPS, l-hPS) and those deuterated counterparts (c-dPS, l-dPS) were used in this study. Temperature dependence for c-PS and l-PS were calculated based on the empirical equations. Taking a slight difference in molecular weights of linear and cyclic molecules into account, temperature dependence value is calculated. The temperature dependence of segmental frictional coefficient for c-PS is found to be the same as that for l-PS. The effect of small amounts of linear contaminants on the diffusion of cyclic molecules might be more significant in low molecular weight regime than in high molecular weigh. The results also show that the linear contaminants can diffuse much faster than the cyclic molecules at a same annealing temperature.
机译：通过二次离子质谱（DSIMS）分析高纯度的环状聚苯乙烯/环状氘代聚苯乙烯双层薄膜的扩散行为对温度和分子量的依赖性。在这项研究中使用了单分散的环状和线性聚苯乙烯（c-hPS，l-hPS）和氘代的对应物（c-dPS，l-dPS）。基于经验公式计算了c-PS和l-PS的温度依赖性。考虑到线性和环状分子的分子量的微小差异，计算温度依赖性值。发现对于c-PS，分段摩擦系数的温度依赖性与对于l-PS的分段摩擦系数的温度依赖性相同。少量线性污染物对环状分子扩散的影响在低分子量条件下可能比在高分子量环境下更为显着。结果还表明，在相同的退火温度下，线性污染物的扩散速度要快于环状分子。

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