Drop deformation, breakup, and coalescence with compatibilizer
Drop deformation, breakup, and coalescence with compatibilizer
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DOI：
10.1063/1.870254
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发表时间：
2000-03-01
影响因子：
4.6
通讯作者：
Leal, LG
中科院分区：
文献类型：
--
作者：
Hu, YT;Pine, DJ;Leal, LG
用四辊磨流动池研究了共聚物对聚二甲基硅氧烷（PDMS）中聚丁二烯（PB）液滴破碎和聚结的影响。通过官能化均聚物之间的反应在界面处产生共聚物。它们降低界面张力，从而促进破碎;它们还抑制液滴的聚结。在我们的实验条件下，后者的影响比前者更显著。例如，添加足以使界面张力相对于裸界面值仅降低3%的共聚物，发现可使聚结的临界毛细管数Ca-c降低6倍。在没有共聚物的情况下，聚结的临界毛细管数也是第一次测量。发现液滴半径a与Ca-c成比例，类似于a（-0.82 +/-0.03），粘度比λ与Ca-c成比例，类似于λ（-0.41 +/-0.06）。(C)2000年美国物理学会。[S1070-6631（00）01203-4]。
The effect of copolymers on the breakup and coalescence of polybutadiene (PB) drops in polydimethylsiloxane (PDMS) is studied using a four-roll mill flow cell. Copolymers are produced at the interface by a reaction between functionalized homopolymers. They reduce the interfacial tension and thus enhance breakup; they also inhibit coalescence of drops. Under the conditions of our experiments, the latter effect is much more significant than the former. For example, the addition of copolymer sufficient to reduce the interfacial tension by only 3% relative to the bare interface value is found to reduce the critical capillary number Ca-c for coalescence by a factor of 6. The critical capillary number for coalescence in the absence of copolymer is also measured for the first time. It is found to scale with the drop radius a as Ca-c similar to a(-0.82 +/- 0.03) and with the viscosity ratio lambda as Ca-c similar to lambda(-0.41 +/- 0.06). (C) 2000 American Institute of Physics. [S1070-6631(00)01203-4].