新型两性聚电解质高吸水性树脂CMCTS-g-（PAA-co-PTMAAC）的制备研究

通过氧化还原引发荆引发的接枝共聚反应,使阴离子型单体丙烯酸(AA)和阳离子型单体三甲基烯丙基氯化铵(TMAAC)在羧甲基壳聚糖(CMCTS)的分子链上接枝共聚,制得羧甲基壳聚糖接枝-(聚丙烯酸-co-聚三甲基烯丙基氯化铵)(CMCTS-g-(PAA-co-PTMAAC)两性聚电解质高吸水性树脂.采用红外光谱对产物的结构进行了表征,比较了反应条件对产物吸液性能的影响.发现制备具有良好吸液性能的高吸水性树脂的最优化反应条件为:TMAAC占单体总质量的14.3%,mNNMBA/mAA值在0.014附近,单体总质量为CMCTS质量的9.33倍,丙烯酸中和度在20%～30%之间.研究发现,随外部溶液pH值的变化,两性聚电解质高吸水性树脂的溶胀性能在酸性和碱性条件下各有一个最大值,在等电点处产物的吸液性相对较低.

STUDY ON PREPARATION OF THE NOVEL CMCTS-g-(PAA-co-PDMDAAC)POLYAMPHOLYTIC SUPERABSORBENT POLYMER

The polyampholytic superabsorbent polymer CMCTS-g-(PAA-co-PTMAAC) was prepared through graft copolymerization of trimethylallyl ammonium chloride(cationic monomer) and acrylic acid(anionic monomer) onto the chain of carboxymethyl chitosan,initiated by the redox initiator.The structure of the graft copolymer was characterized by FTIR.Effects of the reaction conditions on the swelling ratio of the polymer were studied.It was found that the optimization conditions to the synthesized polymer with the highest swelling ratio were as follows:the mass ratio of the crosslinking reagent to acrylic acid was around 1.4%,The mass ratio of the trimethylallylammonium chloride to the vinyl monomer was around 14.3%,(mAA mTMAAC)/mCMCTS was around 9.33,the neutralization degree of the acrylic acid ranges from 20% to 30%.Influence of the pH value of the solution on the water absorption properties of the polymers was studied.It was found that there was highest swelling ratio point at the acidic conditions and basic conditions respectively.The swelling ratio at the isoelectric point was relative low.