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首页> 外文期刊>Journal of Applied Polymer Science >Membrane formation via phase separation induced by penetration of nonsolvent from vapor phase. I. Phase diagram and mass transfer process
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Membrane formation via phase separation induced by penetration of nonsolvent from vapor phase. I. Phase diagram and mass transfer process

机译：非溶剂从气相渗透引起的通过相分离形成的膜。一，相图与传质过程

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摘要

The isothermal phase diagram for poly(vinylidene fluoride)/dimethyl formamide/water system was derived. The binodal and spinodal were calculated based on the Flory-Huggins theory and the calculated binodal was approximately in agreement with the experimental data of the cloud points. The isothermal crystallization line was also obtained according to the theory of melting point depression. Mass transfer of the three components during membrane formation by the precipitation from the vapor phase has been analyzed. During this process, phase separation of the polymer solution is induced by the penetration of water vapor in the solution. The calculated result on the changes of the cast film weights indicated the good agreement with the experimental data. The time-course of the polymer concentration profile in the film was calculated for various cases of different humidity of the vapor phase and different initial polymer concentration.
机译：得出了聚偏二氟乙烯/二甲基甲酰胺/水体系的等温相图。根据Flory-Huggins理论计算了回旋轴和旋节线，计算出的回旋角与浊点的实验数据大致相符。还根据熔点降低的理论获得了等温结晶线。已经分析了在膜形成过程中通过气相沉淀产生的三种组分的传质。在此过程中，聚合物溶液的相分离是由水蒸气渗透到溶液中引起的。流延膜重量变化的计算结果表明与实验数据吻合良好。针对汽相湿度不同和初始聚合物浓度不同的各种情况，计算了膜中聚合物浓度分布的时程。

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