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Influence of additives on the morphology of PVDF membranes based on phase diagram: Thermodynamic and experimental study

机译:添加剂对基于相图的PVDF膜形态的影响:热力学与实验研究

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In the present study, the morphology of asymmetric poly(vinylidene fluoride) blend membranes which were prepared by the phase inversion method is rationalized by comparing two non-dimensional number represent thermodynamic and kinetic properties of the prepared membrane. These two parameters change phase diagram and demixing rate between solvent and nonsolvent. TiO2 nanoparticles and polyvinylpyrrolidone were used as additives. Hansen solubility parameters of the components are calculated by Van Krevelen method. Furthermore, kinetic and thermodynamic properties of the prepared solutions are determined by drawing phase diagrams and controlling mass transfer rate during precipitation of casting solution. Besides, to further analyze different tests encompass; permeability, rejection, porosity, pore size determination, contact angle, and field emission scanning electron microscopy images were carried out. It is shown, additives as pore former induced higher permeability and porosity, however, at higher concentration of additives high viscosity obstacle mass transfer and sponge-like morphology is obtained. (c) 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46225.
机译:在本研究中,通过比较两种非尺寸数代表制备的膜的热力学和动力学性能,通过相位转化方法制备的不对称聚(偏二氟乙烯)混合物的形态进行合理的。这两个参数改变溶剂和非溶剂之间的相图和解剖速率。将TiO2纳米颗粒和聚乙烯吡咯烷酮用作添加剂。汉森溶解度参数由Van Krevelen方法计算。此外,制备溶液的动力学和热力学性能通过拉伸相位图和控制浇铸溶液沉淀过程中的传质速率来确定。此外,进一步分析不同的测试包涵;进行渗透性,抑制,孔隙率,孔径测定,接触角和场发射扫描电子显微镜图像。结果显示,添加剂作为孔隙原诱导较高的渗透性和孔隙率,然而,在较高浓度的添加剂的高粘度障碍物的壳体传递和海绵状形态的渗透性下。 (c)2018 Wiley期刊,Inc.J.Phill。聚合物。 SCI。 2018,135,46225。

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