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OALib Journal期刊
ISSN: 2333-9721
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基于黏弹模型的聚合物溶液相分离的三维数值模拟
DOI: 10.3724/SP.J.1105.2014.13171, PP. 88-98
Keywords: 黏弹模型,聚合物溶液,黏弹性相分离,三维数值模拟
Abstract:
利用GPU加速技术实现黏弹模型的三维数值模拟，系统研究了中等浓度聚合物溶液的分相形貌和相分离动力学.模拟结果表明本体应力的不对称是体系出现相反转的重要原因.与实验观察的聚合物溶液相反转的演化过程一致，首先聚合物富集相形成网络结构，然后聚合物网络收缩断网，最后变为离散的液滴相.本体松弛模量的增加，一方面会抑制相分离初期的浓度涨落，导致相反转发生时间延迟；另一方面在相分离后期有助于形成大的聚合物富集液滴相，加速相区增长.剪切松弛模量的增加只有助于聚合物富集相保持网络结构，并在剪切松弛模量较大的情况下，不规则相结构的缓慢松弛导致了剪切应力在相分离后期长期存在.
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