Comparison of interdiffusion behavior between cyclic and linear polystyrenes with high molecular weights
Comparison of interdiffusion behavior between cyclic and linear polystyrenes with high molecular weights
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DOI：
10.1021/ma060652t
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发表时间：
2006-08-08
期刊：
影响因子：
5.5
通讯作者：
Matsushita, Yushu
中科院分区：
文献类型：
--
作者：
Kawaguchi, Daisuke;Masuoka, Keisuke;Matsushita, Yushu
利用动态二次离子质谱（DSIMS）结合中子反射率（NR）测量研究了高分子量聚苯乙烯（PS）在环状和线型体系中的相互扩散行为。在这项研究中使用的聚合物是单分散的环状和线性PS（c-hPS，1-hPS）和氘代对应物（c-dPS，1-dPS）。用NR和DSIMS研究了界面厚度随退火时间的变化。（c-hPS/c-dPS）界面的增宽比相应的线性界面的增宽快得多。环状聚苯乙烯的扩散比线性聚苯乙烯快得多。在120 ℃时，（c-hPS/c-dPS）和（1-hPS/1-dPS）界面厚度均随温度的升高而增加，且（c-hPS/c-dPS）双层膜的厚度在任何温度下都远大于（1-hPS/1-dPS）双层膜的厚度。
The interdiffusion behavior between cyclic and linear polystyrenes with high molecular weight based on dynamic secondary ion mass spectroscopy (DSIMS) in conjunction with neutron reflectivity (NR) measurements was investigated. Polymers used in this study are monodisperse cyclic and linear PSs (c-hPS, 1-hPS) and those deuterated counterparts (c-dPS, 1-dPS). Time evolution of interfacial thickness with annealing was evaluated by NR and DSIMS. The broadening of the (c-hPS/c-dPS) interface takes place much more rapidly than that of corresponding linear ones. The diffusion of cyclic polystyrene is much faster than that of linear polystyrene. Both thickness of (c-hPS/c-dPS) and (1-hPS/1-dPS) interfaces increase with increasing temperature at 120 C, and that of (c-hPS/c-dPS) bilayer films is much higher than that of (1-hPS/1-dPS) ones at any given temperature.