【作者】 潘凡凡；

【导师】 许涌深；

【作者基本信息】 天津大学 ， 材料学， 2006， 硕士

【摘要】 为了制备吸水性能良好的微球状聚丙烯酸及其盐类的共聚物,采用反相悬浮聚合实施方法,以聚甘油单硬脂酸酯为分散剂,环己烷为连续相,采用N,N`-亚甲基双丙烯酰胺和乙二醇双丙烯酸酯两种交联剂对产物进行交联。在微球内外层形成交联梯度,提高了微球的吸水倍率和凝胶强度,得到性能优越的产物。文中详细研究了该体系中聚合反应的各个工艺条件,如中和度、交联剂浓度、分散剂、搅拌转速等对产物的尺寸、形态、性能的影响。结果表明两种交联剂对吸水倍率的影响很大,而吸水速率主要受到粒径的影响。制备出了吸水倍率高,吸水速度快的微球状高吸水树脂。该聚合物在5分钟内达到平衡吸水倍率1500倍。文中也初步研究了加入油溶性引发剂对高吸水微球性能的改善情况。最后在丙烯酸体系中加入丙烯酰胺,以改善聚合物微球的吸盐水性能。实验证明聚丙烯酸类微球是由多个小的颗粒聚并达到一个相对稳定的状态而形成,这种结构使吸水速率得到了很大的提高,而共聚所制取微球呈现不规整的颗粒,并且共聚微球的热稳定性有所提高。采用红外光谱(IR)、元素分析、光学显微镜、扫描电镜(SEM)、差示扫描量热法(DSC)等方法对产物的内部结构、表面结构、微球形态、热稳定性进行了表征。更多还原

【Abstract】 Inverse suspension polymerization was performed to prepare acrylic based polymer microspher when cyclohaxane was used as organic phase. Suspension stabilizer was an amphiphilic copolymer of tripolyglycerol monostearates.N,N’-methylenebisacrylamide was used as crosslinker. Ethylene glycol diacrylate also was used for subsequently surface-crosslinker to produce gradient crosslink network. Effects of polymerization conditions on the properties of the polymer were studied, including the amount of crosslinker and stabilizer, neutralization degree and stirring speed. It turned out that the water-absorbency of the polymer was mostly affected by the crosslinker concentration, but the speed of absorbency was greatly influenced by the size of the particles. The micro-spheres prepared by this method have good performance. The absorbent capacity in water was 1500g/g water in 5 minutes.At last,acrylamide was added to the polymerization system to prepare the copolymer in effort to increase the saline water absorbency. Research was made on the improvement of absorbency under 650r/min stirring condition. Measure to reduce the adherement was also studied.The surface structure and morphology of micro-sphere and heat property were analyzed by IR, SEM, DSC etc.更多还原