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Synthesis of wheat straw cellulose-g-poly (potassium acrylate)/PVA semi-IPNs superabsorbent resin.

Carbohydrate polymers (2013-04-03)
Jia Liu, Qian Li, Yuan Su, Qinyan Yue, Baoyu Gao, Rui Wang
ABSTRACT

To better use wheat straw and minimize its negative impact on environment, a novel semi-interpenetrating polymer networks (semi-IPNs) superabsorbent resin (SAR) composed of wheat straw cellulose-g-poly (potassium acrylate) (WSC-g-PKA) network and linear polyvinyl alcohol (PVA) was prepared by polymerization in the presence of a redox initiating system. The structure and morphology of semi-IPNs SAR were characterized by means of FTIR, SEM and TGA, which confirmed that WSC and PVA participated in the graft polymerization reaction with acrylic acid (AA). The factors that can influence the water absorption of the semi-IPNs SAR were investigated and optimized, including the weight ratios of AA to WSC and PVA to WSC, the content of initiator and crosslinker, neutralization degree (ND) of AA, reaction temperature and time. The semi-IPNs SAR prepared under optimized synthesis condition gave the best water absorption of 266.82 g/g in distilled water and 34.32 g/g in 0.9 wt% NaCl solution.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
N,N′-Methylenebisacrylamide solution, suitable for electrophoresis, 2% in H2O
Sigma-Aldrich
N,N′-Methylenebisacrylamide, suitable for electrophoresis (after filtration or allowing insolubles to settle)
Sigma-Aldrich
N,N′-Methylenebisacrylamide, powder, for molecular biology, suitable for electrophoresis, ≥99.5%
Sigma-Aldrich
N,N′-Methylenebis(acrylamide), 99%