丙烯酸系高吸水树脂的紫外线分解动力学行为

建立了丙烯酸系高吸水树脂耐候性的评价体系和研究方法，采用紫外线辐照法研究了N，N′-亚甲基双丙烯酰胺交联的丙烯酸/丙烯酰胺共聚物高吸水树脂的分解动力学行为.结果表明：丙烯酸系高吸水树脂的老化机理在于交联剂N，N′-亚甲基双丙烯酰胺在紫外线的作用下水解，导致树脂的交联结构解体.紫外线强度较低时，其分解速度受光反应控制;紫外线强度较高时，则受热反应控制.丙烯酰胺用量增加到70%（质量）、交联剂用量增加到0.139%（质量）、丙烯酸中和度增加到100%，树脂在相同条件下的失重率分别从100%、100%以及42.0%降低到0、9.3%和30.4%.

Decomposition kinetics of acrylic acid-based super-absorbent resin by ultraviolet

The research method and evaluation system of the weather resistance of super-absorbent resin based on acrylic acid were established，and the decomposition kinetics of such a super-absorbent resin were studied with ultra-violet irradiation.The results showed that the aging mechanism of such a super-absorbent resin was the hydrolysis of crosslinker N，N′-methylenebisacrylamide hydrolyzed under ultra-violet light，leading to disassembly of the crosslinked structure.The decomposition rate was controlled by light reaction when the intensity of ultra-violet light was low but was controlled by hot reaction when the intensity of ultra-violet light was high.When the dosage of acrylamide increased to 70%,the dosage of N，N′-methylenebisacrylamide increased to 0.139%，and the neutralization degree of acrylic acid increased to 100%，the loss of mass decreased from 100%，100% and 42.0% to 0、9.3% and 30.4%,respectively.