Preparation of superabsorbent based on the graft copolymerization of acrylic acid and acrylamide onto konjac glucomannan and its application in the water retention in soils |
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| Authors: | Da-Ting Tian Shi-Rong Li Xin-Ping Liu Jing-Shou Wang Sheng Hu Cheng-Mei Liu Hong-Quan Xie |
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| Affiliation: | 1. School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
School of Chemical and Environmental Engineering, Hubei University for Nationalities, Enshi 445000, China;2. School of Chemical and Environmental Engineering, Hubei University for Nationalities, Enshi 445000, China;3. School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China |
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| Abstract: | A new konjac glucomannan (KGM)-based superabsorbent polymer, KGM-g-poly(acrylic acid-co-acrylamide), was prepared by the free radical grafting solution polymerization of acrylic acid (AA) and acrylamide (AM) monomers onto KGM in the presence of N,N′-methylenebisacrylamide as a crosslinker with potassium persulfate as an initiator. The effects of reaction parameters, including the amount of crosslinking agent and initiator, the weight ratio of both (AA + AM) to KGM and AM to (AA + AM), neutralization degree of AA, bath temperature, and reaction time, on the water absorbency of the superabsorbent were investigated. The Fourier transform infrared spectroscopy was used to characterize the structures of the copolymer. The maximum water absorbency of the optimized product was 650 g/g for distilled water and 70 g/g for a 0.9 wt % aqueous NaCl solution. Furthermore, the water retention of the copolymer in soils was studied. The effect of the copolymers on the aggregate distribution of soils was also evaluated. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 |
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| Keywords: | konjac glucomannan graft copolymer superabsorbent functionalization of polymers polysaccharides water retaining agent in soils |
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