How copolymers promote mixing of immiscible homopolymers
作者:
Scott T. Milner,
Haowen Xi,
期刊:
Journal of Rheology
(AIP Available online 1996)
卷期:
Volume 40,
issue 4
页码: 663-687
ISSN:0148-6055
年代: 1996
DOI:10.1122/1.550731
出版商: The Society of Rheology
关键词: Mixing, promoted by copolymers;Copolymers, promotion of mixing;Coalescence;Breakup of droplets;Droplets, coalescence and breakup;COPOLYMERS;MIXING;DROPLETS;COALESCENCE;MULTIPHASE FLOW;SURFACE TENSION;COLLISIONS
数据来源: AIP
摘要:
Copolymers and stirring are commonly used to produce fine dispersions of immiscible homopolymers. Recent experiments call into question the classical view that copolymers promote the mixing by reducing the interfacial tension, suggesting rather that copolymers induce repulsive interactions between droplets and thus inhibit collision‐induced coalescence events. We present a dynamical theory of the breakup and coalescence of polymer droplets in a mixing shear flow, including hydrodynamic and repulsive interactions between droplets. We find that a low surface coverage of copolymers, of the order of one chain per square radius of gyration, is sufficient to inhibit collisions between submicron‐sized droplets, while giving a negligible reduction in interfacial tension.
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