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首页> 外文期刊>Journal of Applied Polymer Science >Microporous anisotropic phase inversion membranes from bisphenol A polycarbonate: Effect of additives to the polymer solution
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Microporous anisotropic phase inversion membranes from bisphenol A polycarbonate: Effect of additives to the polymer solution

机译：双酚A聚碳酸酯的微孔各向异性相转化膜：添加剂对聚合物溶液的影响

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摘要

Phase inversion is a very flexible technique to obtain membranes with a large sort of morphologies. Membrane properties can vary greatly depending on the kind of polymer system used. Bisphenol A polycarbonate (PC) could be used as a phase inversion membrane base polymer, and presents very good properties. Nevertheless, very little information on membrane preparation using PC and the phase inversion process can be found in the literature. In this work flat-sheet microporous membranes were obtained by the phase inversion process using the immersion precipitation technique. A new polymer system was studied, consisting of polycarbonate, N-methyl-2-pyrrolidone as solvent, water as the nonsolvent, and an additive. The influence of some parameters on membrane morphology, such as polymer solution composition, exposition time before immersion into the precipitation bath, and the kind of additive was investigated, Precipitation was followed using light transmission experiments and membrane morphology was observed through Scanning Electron Microscopy (SEM). The viscosity and cloud points of all polymer solutions were also determined. The results were related to the studied synthesis parameters, using the basic principles of membrane formation by the phase inversion technique, looking forward to establishing criteria to control the morphology of flat-sheet membranes using polycarbonate as the base polymer. The results showed that both additives were able to increase pore interconnectivity and even suppress macrovoid formation. The decrease in the miscibility region of the polymer system and increase in mass transfer resistance are found to be the determining factors during polymer solution precipitation. (C) 2002 Wiley Periodicals, Inc. [References: 30]
机译：相转变是获得具有多种形态的膜的非常灵活的技术。膜的性质可以根据所使用的聚合物体系的种类而有很大的不同。双酚A聚碳酸酯（PC）可用作相转化膜基础聚合物，并具有非常好的性能。然而，在文献中几乎找不到有关使用PC进行膜制备和相转化过程的信息。在这项工作中，采用浸没沉淀法通过相转化工艺获得了平板微孔膜。研究了一种新的聚合物体系，该体系由聚碳酸酯，N-甲基-2-吡咯烷酮作为溶剂，水作为非溶剂和添加剂组成。研究了聚合物溶液组成，浸入沉淀浴前的曝光时间，添加剂的种类等参数对膜形态的影响，利用光透射实验对沉淀进行了跟踪，并通过扫描电子显微镜（SEM）观察了膜形态。 ）。还测定了所有聚合物溶液的粘度和浊点。结果与所研究的合成参数有关，利用相转化技术成膜的基本原理，期待建立控制以聚碳酸酯为基础聚合物的平板膜形态的标准。结果表明，两种添加剂均能够提高孔的连通性，甚至抑制大孔隙的形成。发现聚合物体系的可混溶区域的减少和传质阻力的增加是聚合物溶液沉淀期间的决定性因素。 （C）2002 Wiley Periodicals，Inc. [参考：30]

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