The enhancement of the liquid permeability of biomass-based superabsorbent terpolymer
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초록
내용
Superabsorbent polymer (SAP) can absorb and retain water more than several ten times of their dry mass by their three-dimensional hydrophilic structure. Conventional SAP is mainly composed of poly(acrylic acid sodium salt) derived from petrochemicals. We try to reduce the use of the petrochemical moiety and replace them with biomass-based materials. Firstly, we prepared core-SAP using the terpolymerization of itaconic acid, vinylsulfonic acid, and cellulose. We found the optimal conditions of terpolymer composition according to material input ratio. And then, the core-SAP was surface-crosslinked through esterification reaction with butane diol to improve its liquid permeability and absorbency under load (AUL). Liquid permeability was measured by the amount of 0.9 wt % NaCl solution that has passed between the swollen SAP particles under a given pressure. AUL was estimated the weight of 0.9 wt % NaCl solution absorbed under 0.3psi pressure.