羟乙基纤维素与聚丙烯酸钠接枝共聚及其溶胀行为

采用微波法合成羟乙基纤维素/聚丙烯酸钠接枝共聚物(HEC-g-PAA),考察了单体中和度、单体用量、引发剂质量浓度等因素对接枝率和吸水率的影响,并研究了不同粒度HEC-g-PAA的溶胀行为.结果表明,HEC-g-PAA的溶胀过程属于非Fick扩散过程,链段松弛是树脂吸水的主要原因.

Preparation and Swelling Behavior of Grafting Copolymer HEC-g-PAA

Grafting sodium polyacrylate onto hydroxyethyl cellulose (HEC-g-PAA) has been carried out by using microwave method. The effect of the reaction conditions such as the concentration of initiator, the neutralization degree of the acrylic acid and the amount of monomer on the percentage of grafting and absorbency have been studied. The swelling behavior of HEC-g-PAA which have different sizes were discussed. The results were analyzed in terms of the non-Fickian equation; the result showed that relaxation contribution is the main cause in absorbing process.