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首页> 外文会议>North American Membrane Society >Pore Structure Control of PVDF Membranes Using Dual Coagulation Bath Phase Inversion Process for Application in Membrane Distillation (MD)
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Pore Structure Control of PVDF Membranes Using Dual Coagulation Bath Phase Inversion Process for Application in Membrane Distillation (MD)

机译：使用双凝固浴相反转过程对PVDF膜的孔结构控制膜蒸馏应用（MD）

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摘要

Membrane fabrication by phase inversion is a sophisticated process that involves interplay of different processing parameters, including the choice of a coagulation bath; its composition, temperature and immersion time. The phase inversion path of a membrane forming system is dictated by the composition of the coagulation and casting solution [1], which influences the solvent exchange rate. Coagulation bath liquids are categorized into soft and harsh solvents, based on the extent of the de-mixing stage, crucial to pore formation in the phase inversion pathway. Systems with a rapid phase inversion rate tend to form macro-voids with finger-like structures, whereas systems with a slow phase inversion rate yield sponge-like structures [2]. The employment of non-aqueous solvent in the coagulation bath or the addition of such solvent into a water bath may induce delayed liquid-liquid de-mixing of the polymer and eventually result in the formation of membranes with sponge-like structure or even spherulite formation [3,4].
机译：膜制造通过相位倒置是一种复杂的过程，涉及不同加工参数的相互作用，包括选择凝固浴;它的组成，温度和浸入时间。膜形成系统的相倒置路径由凝血和浇铸溶液的组成来决定，其影响溶剂汇率。基于脱模阶段的孔隙形成至关重要，凝结浴液分为软和刺激性溶剂，对孔隙形成的孔隙形成至关重要。具有快速相位反转率的系统倾向于形成具有指状结构的宏空隙，而具有慢相倒置率的系统产生海绵状结构[2]。在凝固浴中的非水溶剂在水浴中加入这些溶剂可以诱导聚合物的延迟液 - 液脱模，最终导致形成具有海绵状结构的膜或均匀的球膜形成[3,4]。

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