Thermo-tunable Swelling Effect of Cellouronic Acid Sodium-based Superabsorbent Hydrogels
GAO Xin, HAN Qunqing, ZHANG Heng, CHEN Keli
Pulp and Paper Engineering Research Center of Yunnan Higher Education, Chemical Engineering Faculty, Kunming University of Science and Technology, Kunming 650500
Abstract: The high water-absorbent hydrogels with thermo-tunable swelling property represent a versatile and promising class of functional materials in both academic and industrial fields due to their unique characteristics, such as multifold change of volume in response to minute change in the ambient temperature. Cellouronic acid sodium (CAS) is a water-soluble cellulose derivative produced by a selective oxidation of cellulose, but its modification of functional hydrogels was less documented. Based on a sequential synthesis method, the copolymer network was firstly synthesized with acrylamide (AM) and diallyldimethylammonium chloride (DAC) as comonomers, N,N′-methylenebisacrylamide (MABM) as crosslin-ker. Then, linear polymer CAS obtained from bagasse pith, has been introduced into cross-linked poly(AM-co-DAC) to form thermo-sensitive semi-interpenetrating polymer networks (semi-IPNs). The chemical composition and morphology of hydrogel were characterized by FT-IR, XPS and SEM. The effects of CAS dosage, initiator charge and medium property on gel's swelling ability at various temperatures were also investigated. The results showed that the prepared CAS-based gels exhibited a high water-absorbency and temperature-tunable swelling property. The swelling degree enhanced with increasing ambient temperature. Both swelling ability and its thermo-sensitivity largely depended on the chemical structure of the semi-IPNs and the solvent property.
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2019, Vol. 33 
