壳聚糖接枝聚丙烯酸高吸水性树脂的合成工艺

STUDY ON THE PREPARATION OF THE CHITOSAN GRAFT POLY(ACRYLIC ACID) SUPERABSORBENT POLYMER

在水溶性引发剂过硫酸铵的引发下,使丙烯酸在壳聚糖的分子链上接枝聚合,并加入N,N′-亚甲基双丙烯酰胺进行一定程度的交联,制得高吸水性树脂。采用FT-IR和SEM对所合成的高吸水性树脂进行了结构表征。研究了反应条件对所制得的高吸水树脂吸水性能的影响。结果表明,使树脂具有最高吸水性能的最优化反应条件为:m(AA)/m(CTS)=10,引发剂和交联剂与单体的质量比分别为3.3%和0.16%,反应温度65℃,反应时间5.5 h。在此条件下合成的树脂最大吸水倍率可达1180 g/g,吸盐水倍率可达120 g/g。

Acrylic acid was graft polymerized onto the chain of chitosan, initiated with ammonium persulfate. After crosslinked with N,N＇-methylene diacrylamide, a kind of novel superabsorbent polymer was prepared. The structure of the polymer was characterized through FT-IR and SEM. Influence of the reaction conditions on the swelling ratio of the polymer was studied. It is found that the optimization condition to synthesize the polymer with the highest swelling ratio is as follows, m（AA）/m（CTS）=10, the mass ratio of the initiator and the crosslinking reagent to acrylic acid is 3.3% and 0. 16% respectively, the reaction temperature is 65℃ and the reaction time is 5.5 h. The polymer synthesized at this condition can absorb 1180 times distilled water and 120 times normal saline.