【摘要】 采用气相接枝方法研究了硅烷交联聚丙烯材料。探讨了在过氧化物作用下乙烯基三甲氧基硅烷(VTMS)气体在聚丙烯粉末表面进行气相接枝反应的机理,及引发剂过氧化二异丙苯(DCP)和VTMS单体浓度对硅烷接枝率和水解交联产物凝胶含量的影响。用富里叶变换红外光谱(FTIR)和富里叶变换红外光声光谱(FTIR-PAS)对反应产物进行了分析。结果表明,单体和引发剂在聚丙烯中的扩散情况对硅烷接枝率存在较大影响。增加引发剂和硅烷单体的用量,硅烷的接枝率上升,其增加趋势在单体浓度为0.026 mol/L和引发剂质量分数大于0.6%后逐渐变缓。更多还原

【Abstract】 Vapor phase grafting of vinyltrimethoxysilane(VTMS) onto polypropylene(PP) powders and its subsequent hydrolysis crosslinking were studied in this work.The vapor grafting mechanism of VTMS onto PP through free radical was studied.The effects of the VTMS monomer and initiator concentrations on the grafting degree of the silane and gel content of the crosslinked samples were investigated.FTIR and FTIR-PAS were used to analyze the grafted materials.The result shows that the diffusion conditions of the monomer and the(initiator) in the PP have significant influence on the VTMS grafting degree.The grafting degree of VTMS(increases) with increasing monomer and initiator concentrations,and this trend slows down when the concentrations of the monomer and the initiator are over 0.026 mol/L and 0.6%,respectively.更多还原