Co-continuous morphologies in polymer blends: a new model

被引:167
作者
Willemse, RC [1 ]
de Boer, AP [1 ]
van Dam, J [1 ]
Gotsis, AD [1 ]
机构
[1] Delft Univ Technol, Dept Polymer Technol, NL-2628 BL Delft, Netherlands
关键词
polymer blends; co-continuous morphology; phase inversion;
D O I
10.1016/S0032-3861(97)10200-2
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
A model for phase continuity in polymer blends based on geometrical requirements for co-continuous structures has been developed. The minor phase of a fully co-continuous blend is considered as a dispersion of randomly oriented rods at their maximum packing density in the major phase. An existing empirical relation between this packing density and the aspect ratio of the rods, in conjunction with micro-theological requirements for the existence of such rods, results in an equation describing the critical volume fraction of the minor phase for complete co-continuity as a function of the matrix viscosity, interfacial tension, shear rate and phase dimensions. This equation naturally leads to a range of compositions within which fully co-continuous structures can exist. It is demonstrated that existing relations between the volume fraction at phase inversion and the viscosity ratio of the blend components are not generally valid. Experimental evidence obtained by blending of PS and PE shows that the new model quantitatively predicts trends in the critical volume fraction as a function of the viscosities of both phases. An absolute prediction is not yet possible because the phase dimensions cannot a priori be predicted, bur have to be measured. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:5879 / 5887
页数:9
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