On the coarsening of co-continuous morphologies in polymer blends: effect of interfacial tension, viscosity and physical cross-links
On the coarsening of co-continuous morphologies in polymer blends: effect of interfacial tension, viscosity and physical cross-links
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DOI：
10.1016/s0032-3861(99)00455-3
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发表时间：
2000-04
期刊：
影响因子：
4.6
通讯作者：
H. Veenstra;J. Dam;A. P. D. Boer
中科院分区：
文献类型：
--
作者：
H. Veenstra;J. Dam;A. P. D. Boer
研究了聚合物共混物中共连续形貌的退火粗化，证明了热塑性弹性体共混物中界面张力、粘度和物理交联的影响。50/50wt%的共连续形貌在退火过程中保持共连续，但随着时间的推移，相尺寸呈线性增加。30/70wt%的混合物在粗化过程的第一阶段分解成液滴/基体形态，并显示出相尺寸的增加。提出了仅使用两组分的界面张力和粘度来预测粗化增长率的关系。该关系与实验结果吻合较好。当热塑性弹性体中存在物理交联时，热塑性弹性体共混物的粗化过程严重减慢甚至停止。粗化的驱动力太小，无法克服物理交联产生的稳定力。
The coarsening of co-continuous morphologies in polymer blends with annealing is studied, demonstrating the effect of interfacial tension, viscosity and also physical cross-links in blends with thermoplastic elastomers. Co-continuous morphologies of 50/50wt% stay co-continuous with annealing but show a linear increase in phase size with time. The 30/70wt% blends break up into droplet/matrix morphologies and shows an increase in phase size in the first stage of the coarsening process. A relation has been proposed, using only the interfacial tension and viscosities of both components, to predict the growth rate of coarsening. The relation shows good agreement with the rates found experimentally. The coarsening process in blends with thermoplastic elastomers is severely slowed down or even stopped when physical cross-links are present in the thermoplastic elastomers. The driving force for coarsening is too small to overcome the stabilizing force due to physical cross-links.