分步法合成SA-IP-P(AA/AM)互穿网络高吸水性树脂及其性能研究

以淀粉接枝丙烯酸共聚物SA为互穿物,以丙烯酸(AA)、丙烯酰胺(AM)为聚合单体,N,N’-亚甲基双丙烯酰胺(NMBA)为交联剂,采用(NH4)2S2O8-NaHSO3氧化还原引发体系,通过分步法制备SA-IP-P(AA/AM)互穿网络高吸水性树脂。其适宜反应条件为:w(丙烯酰胺/丙烯酸)=0.4;丙烯酸中和度85%;引发剂用量0.32%;交联剂用量0.035%;SA用量8%.在此条件下合成的SA-IP-P(AA/AM)树脂吸去离子倍率和吸0.9%NaCl盐水倍率分别可达到1 480 g.g-1和120 g.g-1.通过红外光谱、扫描电镜、透射电镜和X射线衍射等测试研究了产物中互穿聚合物网络结构,结果显示在保持已有树脂优良性能的基础上,进一步改善了高吸水树脂的保水性能、耐盐性和对环境中水分的应答性.

Synthesis of SA-IP-P(AA/AM) superabsorbent resin with IPN by fractional step method and research of its properties

A novel SA-IP-P(AA/AM) interpenetrating network(IPN) super absorbent resin was synthesized via fractional step method,which used SA as interpenetrating polymer,acrylic acid(AA) and acrylamide(AM) as polymerization monomer,N,N'-methylene biasacrylamide as crosslinking agent,ammonium persulfate and sodium hydrogensulfite as the redox initiator.The optimum synthesis conditions were monomer AA/AM proportion 0.4,neutralization degree 85%,initiator 0.32%,crosslinking agent 0.035% and SA 8%.Under such conditions,the water absorbency and 0.9%NaCl saline absorbency of SA-IP-P(AA/AM) resin could reach 1 480 g·g-1 and 120 g·g-1 respectively.The authors studied the IPN structure in the product via IR,SEM,TEM and X-ray diffraction.On the basis of retaining good performance of synthesized resin,they further improved the water absorbency,saline absorbency and environmental responsibility of super absorbent resin.