【作者】 刘元伟；

【导师】 刘盈海；

【作者基本信息】 河北大学 ， 高分子化学与物理， 2005， 硕士

【摘要】 本文研究了二羟基二过碘酸合镍(IV)(Ni(IV))钾氧化还原引发丙烯酸酯类、丙烯腈等单体在聚乙二醇、聚酯二醇上的嵌段共聚合以及甲基丙烯酸甲酯在聚丙烯酰胺上接枝共聚合反应。并将其分为三个部分论述。第一章,对二羟基二过碘酸合镍(IV) 钾、以及嵌段共聚物的发展及研究现状进行了阐述。并阐明了利用超常价态过渡金属镍(IV)的强氧化性,与聚乙二醇、聚酯二醇大分子组成氧化还原引发体系,引发丙烯酸酯类、丙烯腈等单体在大分子上的嵌段共聚合反应的理论及现实意义。此外, 还研究了甲基丙烯酸甲酯在聚丙烯酰胺上接枝共聚合反应,阐明了其理论意义。第二章,研究了镍(IV)引发丙烯酸酯类、丙烯腈等单体在聚乙二醇、聚酯二醇大分子上嵌段共聚合反应以及动力学规律。成功地获得嵌段共聚物,测得了各反应因素对嵌段参数的影响,找到了嵌段共聚合反应的最佳条件;同时借助红外光谱、热重分析、核磁、扫描电镜等手段对嵌段共聚物进行了表征,并探讨了引发机理。第三章,利用Ni(IV)的强氧化性,引发甲基丙烯酸甲酯在聚丙烯酰胺上的接枝共聚合反应,并对其接枝产物进行了表征,证明接枝产物的抗吸潮性和热性能都有所提高。更多还原

【Abstract】 This paper has invested the application of potassium diperiodatonickelate(IV) (Ni(IV)) in the block/graft copolymerization of poly(ethylene glycol)(PEG)、poly(1,2-propylene glycol adipate)(PPA)、polyacrylamide(PAAM) and will be divided in three section. In the first chapter, the development and the present research situation of Ni(IV) and block copolymer were elaborated; The application of Ni(IV) to initiating block copolymerization of acrylate monomers、acrylonitrile onto Poly(ethylene glycol)(PEG) 、Poly(1,2-propylene glycol adipate)(PPA) respectively was also cited, which has great theoretical and current significant. Moreover, it was set forth that the graft copolymerization of PAAM and its research purpose. In the secondly, Ni(IV)-PEG、Ni(IV)-PPA redox system was employed to initiate the block copolymerization of methyl acrylate(MA) onto PEG 、PPA in aqueous alkaline medium. The blocking parameters have been determined as a function of concentrations of monomer and initiator, temperature as well as time. The structure and thermal stability of the block copolymers were confirmed by Flourier transfer infrared spectroscopy(IR), thermogravimetric analysis (TGA), 1H nuclear magnetic resonance(1HNMR) and scanning electron microscope (SEM). The two separate single-electron transfer mechanism is proposed to explain the formation of the radical and the initiation. In the last chapter, the graft copolymerization of methyl methacrylate(MMA) onto polyacrylamide(PAAM) by -Ni(IV)-PAAM in aqueous alkaline medium was investigated. The graft copolymer was characterized by Flourier transfer infrared spectroscopy(FTIR), thermogravimetric analysis(TGA) and X-ray diffraction, scanning electron microscope (SEM). Thermogravimetric analysis validated that the graft copolymer was more resistant to moisture absorption, and had higher heat-stability than polyacrylamide.更多还原