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Surface skin layer formation and molecular separation properties of asymmetric PEEKWC membranes

机译:不对称PEEKWC膜的表面皮层形成和分子分离特性

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Asymmetric membranes based on a poly(ether ether ketone) with a phthalido group along the polymeric backbone (PEEKWC) were prepared by non-solvent induced phase separation. Three chlorinated solvents (i.e. chloroform, dichloromethane and 1,2-dichloroethane - TCM, DCM and DCE in the following), at fixed evaporation times between casting and coagulation in methanol, have been used to investigate the effect of different evaporation rates on the formation of the skin layer structure. The surface morphology of the membranes has been determined by AFM. Membranes prepared by using DCM and TCM as solvents are characterized by the presence of a dense skin layer with different grain size, whereas a porous skin layer is formed with DCE. These differences arise from the volatility (DCM>TCM>DCE) and the solvation ability (DCM
机译:通过非溶剂诱导的相分离,制备了基于带有沿聚合物主链的邻苯二甲酰基的聚醚醚酮的不对称膜(PEEKWC)。三种氯化溶剂(即氯仿,二氯甲烷和1,2-二氯乙烷-以下为TCM,DCM和DCE)在铸造和甲醇凝结之间的固定蒸发时间已用于研究不同蒸发速率对地层的影响皮肤层结构。膜的表面形态已经通过AFM确定。通过使用DCM和TCM作为溶剂制备的膜的特征在于存在具有不同晶粒尺寸的致密表皮层,而由DCE形成多孔表皮层。这些差异是由溶剂的挥发性(DCM> TCM> DCE)和溶剂化能力(DCM

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