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Structure-property relationships in radiation grafted poly(tetrafluoroethylene)-graft-polystyrene sulfonic acid membranes

机译:辐射接枝聚四氟乙烯-接枝聚苯乙烯磺酸膜的结构-性质关系

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摘要

Structure-property relationships in poly(tetrafluoroethylene)-graft-polystyrene sulfonic acid (PTFE-g-PSSA) membranes prepared by radiation-induced grafting of styrene onto poly(tetrafluoroethylene)(PTFE) films using simultaneous radiation-induced grafting followed by sulfonation reaction were established. The physico-chemical properties of the membranes such as ion exchange capacity, water uptake (swelling) and ionic conductivity were investigated in correlation with the degree of grafting (the amount sulfonated polystyrene grafted therein) and the structural changes taking place in the membrane matrix during the preparation step. The variation in the crystallinity of membranes was studied by differential scanning calorimetry (DSC). The membrane thermal stability was investigated using thermogravimetric analysis (TGA), ion exchange capacity and water uptake measurements. The membranes were found to undergo substantial structural changes in a form of ionic sites increase, hydrophicity enhancement, hydrophobicity reduction and crystallinity decrease with the increase in the degree of grafting. The all four factors were found to have a collective effect on the physico-chemical properties of the membranes but their relative contribution depends on the degree of grafting.
机译:辐射诱导的苯乙烯同时接枝到聚四氟乙烯(PTFE)膜上的辐射诱导接枝,然后进行磺化反应制备的聚四氟乙烯-接枝聚苯乙烯磺酸(PTFE-g-PSSA)膜的结构-性质关系成立。研究了膜的物理化学性质,例如离子交换容量,吸水率(溶胀)和离子电导率,与接枝程度(接枝的磺化聚苯乙烯的量)以及膜基质在膜表面的结构变化有关。准备步骤。通过差示扫描量热法(DSC)研究了膜的结晶度变化。使用热重分析(TGA),离子交换容量和吸水率测量研究了膜的热稳定性。发现膜随着接枝程度的增加以离子位点增加,亲水性增强,疏水性降低和结晶度降低的形式经历了实质性的结构变化。发现所有这四个因素对膜的物理化学性质都有共同的影响,但是它们的相对贡献取决于接枝的程度。

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