交联剂分子量对高吸水性树脂性能的影响  

THE EFFECT OF CROSSLINKERS ON SUPERABSORBENTS

作　　者：孙民伟[1] 张健[1] 高彦芳[1] 谢续明[1] 

机构地区：[1]清华大学化学工程系高分子研究所先进材料教育部重点实验室,北京100084

出　　处：《高分子学报》2004年第4期595-599,共5页Acta Polymerica Sinica

基　　金：国家自然科学基金重点基金资助项目 (基金号 10 3 3 40 2 0 )

摘　　要：通过丙烯酰氯对聚乙二醇的封端反应合成了一系列分子量不同、结构类似的交联剂———聚乙二醇二丙烯酸酯 (PEGDA) ,并用于聚丙烯酸高吸水性树脂的制备 .运用FTIR对PEGDA进行了分析 .吸水性能实验结果表明 ,交联剂的分子量越大 ,则高吸水性树脂的吸水倍率越高 ,吸水速率越大 ,而相对吸水速率降低 .同时 ,PEGDA与常用的交联剂N ,N′ 亚甲基双丙烯酰胺 (MBA)相比 ,前者制备的高吸水性树脂的吸水倍率远高于后者 ;线型可溶性聚合物及残留单体的含量 。A series of crosslinkers (polyethylene glycol diacrylate, PEGDA) with different molecular weights were synthesized through end-capping of PEG by acryloyl chloride. The structures of the PEGDAs were characterized by FTIR. The water-absorbency of sodium polyacrylate crosslinked with PEGDAs was determined. In the experiments of water-swelling in deionized water, it was revealed that when the molecular weight of the crosslinker increased, the maximum of equilibrium water-absorbability of the synthesized superabsorbents was enhanced and the rate of water-swelling increased too, but the relative rate of water-swelling decreased. The relationship between the network structure of the superabsorbents and the water-absorbency was also discussed. Comparing PEGDA and MBA, the superabsorbents crosslinked with the former had much stronger water-absorbability, fewer residual monomers and less dissoluble linear polymers than the one crosslinked with the latter.

关 键 词：交联剂 分子量 高吸水性树脂 聚乙二醇二丙烯酸酯 聚丙烯酸 吸水倍率 

分 类 号：TQ324.8[化学工程—合成树脂塑料工业]