Preparation and Performance of UV Photopolymerized PAA/CMC Superabsorbent Resin
Polyacrylic acid/sodium carboxymethyl cellulose(PAA/CMC)superabsorbent resin was synthesized by grafting monomer acrylic acid(AA)onto the sodium carboxymethyl cellulose framework through ultraviolet light-initiated polymerization.The optimal preparation conditions for the resin with the highest water absorption capacity were optimized and determined using a single factor experimental method.The results show that the optimal conditions for synthesizing the resin are as follows,the amount of CMC is 0.05 g,the mass concentration of AA is 0.48 g/mL,and the neutralization degree of AA is 40％,the amount of initiator and crosslinking agent are 0.3％and 0.05％of the mass of AA,respectively,and the reaction time is 55 min.The prepared super absorbent resin has a water absorption rate of 1 281.21 g/g in distilled water and 69.42 g/g in physiological saline.The structure of the resin is characterized by infrared,thermogravimetry,and scanning electron microscopy.The results indicate that the preparation method has successfully synthesized PAA/CMC superabsorbent resin,which has good thermal stability and obvious wrinkled structure on the resin surface.The prepared high water absorption resin has the characteristics of fast water absorption rate and good water retention.
High Water Absorbent ResinUltraviolet Light-initiatedSodium Carboxymethyl CelluloseAcrylic Acid
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