紫外辐射法合成四元共聚高吸水性树脂及其性能研究

采用紫外固化法,以丙烯酸(AA)、丙烯酰胺(AM)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)、淀粉为单体,以N,N′-亚甲基双丙烯酰胺(MBA)为交联剂,在不加引发剂和无任何气氛保护下合成了AA/AM/AMPS/淀粉共聚高吸水性树脂,考察了反应条件对树脂吸液倍率的影响,并采用红外、偏光显微镜对树脂的分子结构及表面形态进行了表征。通过正交实验得到最佳反应条件为:n(AMPS):n(AA):n(AM)=1:1:1,pH=6.5,w(MBA)=0.02%,w(淀粉)=12.5%,光照时间为4 min。在优化条件下合成的高吸水性树脂吸蒸馏水倍率为1 194 g/g,吸盐水倍率为38 g/g。并且树脂吸水过程符合一级动力学,

PREPARATION AND STUDY OF QUATERNARY COPOLYMER SUPERABSORBENT VIA ULTRAVIOLET IRRADIATION

Using N,N'-methylene-bis-acrylmide (MBA) as crosslinker,a superabsorbent of starch graft acrylamide (AM),acrylic acid (AA) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) was prepared via ultraviolet irradiation without initiator in nitrogen atmosphere.The influences of the reaction conditions like monomer proportion and pH on the water absorbency were investigated.The molecular structure and surface morphology were characterized by FT-IR and microscope,respectively. The influence on water absorbency was investigated via orthogonally arranged tests.Based on the experimental results,the optimum reaction conditions were: pH = 6.5,w(MBA) =0.02%,n (AMPS):n(AA): n(AM) = 1:1:1,w(starch) = 12.5% and reaction time 4 min.The results showed that the absorbency of the copolymer was 1 194 g/g for distilled water and 38 g/g for 0.9% NaCl solution under the optimized conditions,and the kinetics of the swelling process followed first order kinetics equation.