Nucleation, growth, fractal aggregation, and late-stage coarsening on structural development of polymer physical gels

被引:23
作者
Chou, CM [1 ]
Hong, PD [1 ]
机构
[1] Natl Taiwan Univ Sci & Technol, Dept Polymer Engn, Taipei 10673, Taiwan
关键词
D O I
10.1021/ma049361f
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
By using the time-resolved small-angle light scattering (TRSALS) technique, we present the real-time measurement of the physical gelation process for a crystalline polymer. To investigate the growth kinetics, a complete picture of the gel structural formation should be differentiated into the nucleation and growth of the microgels, the diffusive aggregation of the microgels, the percolation in cluster-cluster aggregation process, and the late-stage coarsening by the Ostwald ripening process. We propose some phenomenological functions to describe the hierarchical structure of the nucleation gels. The modeling of the late-stage gel structure could be built upon the following three relevant categories: the structure of the primary particle, the nonfractal local structure of a random packing of the nearest neighbors, and the fractal correlations between the particles constituting the aggregates. The model is able to reproduce the overall behavior of H-v and V-v scattering intensity distributions over the experimental q range and holds the truth of the gel structural development in the late-stage coarsening process.
引用
收藏
页码:5596 / 5606
页数:11
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