Ni(Ⅳ)引发苯乙烯在纤维素上接枝共聚合反应  

Graft Copolymerization of Styrene onto Cellulose Initiated by Potassium Diperiodatonickelate(Ⅳ)

作　　者：程倩[1] 徐建中[1] 

机构地区：[1]河北大学化学与环境科学学院,河北保定071002

出　　处：《河北大学学报（自然科学版）》2008年第3期263-268,共6页Journal of Hebei University(Natural Science Edition)

基　　金：河北省自然科学基金资助项目(B2007000144)

摘　　要：以超常价态过渡金属二羟基二过碘酸合镍(Ⅳ)酸钾(简称Ni(Ⅳ))为氧化剂、纤维素为还原剂,组成氧化还原引发体系,于碱性介质中,在纤维素表面引发苯乙烯接枝共聚合反应,测定了不同的Ni(Ⅳ)浓度、单体与纤维素质量比、反应温度、反应时间和pH值对接枝参数的影响,获得了接枝共聚合反应的最佳实验条件,得到了高接枝参数的接枝共聚物.用红外光谱(IR)、电镜等方法对共聚物结构进行了表征,探讨了引发机理.The graft copolymerization of styrene （St） onto cellulose using potassium diperiodatonickelate （Ⅳ） （Ni（ Ⅳ ））-cellulose redox system as initiator has been studied in alkaline medium. The effect of different factors on grafting parameters is investigated. The grafting parameters have been determined as a function of Ni（Ⅳ） concentration, monomer-to-cellulose ratio, reaction temperature, reaction time and pH value. It is found that （Ni（ Ⅳ ））-cellulose system is an efficient redox initiator for this graft copolymerization. The structure of the graft copolymer has been determined by infrared（IR）. It is found that Ni（ Ⅳ ）-cellulose system is an efficient redox initiator for this graft copolymerization. A two-step single-electron transfer mechanism is proposed to explain the formation of radicals and the initiation. The SEM photographs indicate that the graft copolymer greatly improves the compatibility of the blend.

关 键 词：二羟基二过碘酸合镍(Ⅳ)酸钾 纤维素 苯乙烯 接枝共聚 

分 类 号：O631.5[理学—高分子化学]