【作者】 杨向民；

【导师】 薛仲华； 黄国章；

【作者基本信息】 华东理工大学 ， 轻工技术与工程， 2010， 硕士

【摘要】 本文介绍了聚四氟乙烯-六氟丙烯(FEP)基膜预辐射接枝法制备接枝膜、磺化制备强酸性阳离子交换膜。在研究中分别采用苯乙烯(St)、对氟苯乙烯(F-St)、对氯苯乙烯(Cl-St)为接枝单体,并对FEP-St接枝膜进行了溴化改性。研究了对氟苯乙烯单体的接枝反应,探讨了辐射剂量、接枝温度等因素对接枝反应的影响,得到了接枝反应动力学方程、表观活化能等参数。采用热重-差示扫描量热分析(DSC-TGA)法分析了接枝膜和磺化膜,结果证明：接枝链的热稳定性受取代基电负性影响,接枝链的键能强度依次为：F>Cl>H;取代基电负性影响了阳离子膜的酸性,酸性由大到小依次为：F>Cl>H。采用高锰酸钾氧化实验研究了磺化膜的耐氧化性,表明：苯环上吸电子基团影响了侧链的耐氧化性,耐氧化性由小到大依次为：FEP-St-SO3H<FEP-St-Br-SO3H<FEP-ClSt-SO3 H<FEP-FSt-SO3H。拉曼光谱分析结果证明：吸电子基团的存在使苯环上C-H的键能提高。扫描电镜结果显示,接枝单体的分子量影响了接枝膜的微观结构,分子量越大膜结构越致密。XRD研究结果显示,接枝膜的结晶度低于FEP。更多还原

【Abstract】 This article introduced grafted membrane prepared with tetrafluoroethylene-hexafluoropropylene copolymer by the method of preirradiation graft copolymerization and strong acid sulfonated cation-exchange membrane prepared with sulfnation. In the research, we used of styrene (St), Fluorostyrene (F-St), chloro-styrene (Cl-St) as the grafting monomer, and FEP-St grafted films were modified bromide.We explored the the grafting reaction of p-Fluorostyrene monomer, then discussed the influences of the radiation dose, grafting temperature on the grafting reaction, and got grafting reaction kinetic equation, the apparent activation energy and other parameters.By analyzing grafted membranes and sulfonated membrane with DSC-TGA, we proved that:the thermal stability of graft chain was effected by the substituent. The order of bond energy intensity:F> Cl> H; the electronegativity of Substituents also affected the acidity of the membranes. Experimental studies which using KMnO4 about the oxidation of the sulfonated membrane showed that:the electron withdrawing groups on the benzene ring affected the side chain, oxidation from small to large order is:FEP-St-SO3H< FEP-St-Br-SO3H< FEP-ClSt-SO3H< FEP-FSt-SO3H. Raman spectroscopy results showed that:the presence of electron withdrawing groups improved the bond energy of C-H in the benzene ring. Scanning electron microscopy showed that the molecular weight of grafted monomer affected the micro-structure of grafted membranes, and larger of the molecular weight, more dense of membrane structure. XRD results showed that the crystallinity of grafted membranes was lower than FEP.更多还原