真空制备木薯淀粉超吸水材料

采用真空技术成功制备了一种木薯淀粉（CS）-g-丙烯酸（AA）超吸水材料。在AA与cS质量比2．5：l，过硫酸钾0．07g，30％wt氢氧化钠水溶液中和度（摩尔比）20％，N，N’-弧甲基双丙烯酰胺0．14％（占AA重）条件下，65℃真空恒温反应3h，干燥后得超吸水材料（cs．SAP）。一定温度湿度条件下，不同形状CS—SAP吸液能力及保水性能有一定差别，保留4％凝胶残重的材料保水时间最长可达28d：材料吸去离予水倍率高达1316．8（g／g）、自来水673．1（g／g）、0．9％NaCI水溶液54．8（g／g）、人工尿液63．0（g／g）。接枝反应及材料吸水结构经FTIR．SEM，PM表征。

Vacuum Synthesis of Cassava Starch Graft Poly（ acrylic acid） of Super Absorbent Polymer

In the paper,a superabsorbent polymer was first prepared by vacuum graft copolymerization of cassava starch and acrylic acid,with potassium persulfate as an initiator,N,N’-methylene diacrylamide as crosslinking agent.The reaction conditions were 2.5 mass ratio of acrylic acid to cassava starch,0.14 % mass ratio of crosslinker to acrylic acid,initiator 0.07 g,20 % neutralization degree of acrylic acid(Using a mass percentage of 30 % sodium hydroxide solution);polymerization at 65 ℃ for 3 h under vacuum.Different shapes of materials had some differences about water absorption rate and water retention.In a certain temperature and humidity conditions,the retention time of 4 % residual weight of water gel can reach to 28 d.The water-absorbing rate of the prepared resin can reach 1316.8(g/g)at room temperature.The saline water(0.9 % NaCl) absorbency was 54.8(g/g),water absorbency in tap water and in synthetic urine in 24 h was about 673.1(g/g)and 63.0(g/g).Grafting reaction and structure of CS-SAP characterization by FTIR,SEM,PM.