Preparation and Characterization of Superabsorbent Resin from Agaricus Bisporus Stipes
Using β-Glucan from the stipes of Agaricus bisporus,acrylic acid and acrylamide as mono-mers,and N,N-methylene bis acrylamide as crosslinking agent,a new superabsorbent resin was pre-pared by aqueous solution polymerization.The optimal synthesis conditions of the superabsorbent res-in were as follows:5 g of stipes powder of Agaricus bisporus pretreated by extrusion was mixed well with 0.1 g of potassium persulfate and 20 mL of deionized water at first.The additive amount of acrylic acid which was neutralized by 70%before use was 6 g,and those of acrylamide and N,N-methy-lene bis acrylamide were 1.0 g and 0.01g.The reaction temperature was 70℃.The swelling rate of the products reached 474.9 g/g,and the water retention rate was still as high as 78.4%in 12 hours at 20℃.FT-IR analysis showed that all the reactants participated in the graft polymerization,and SEM images showed that the expanded powder of Agaricus bisporus stipes used as a reaction monomer made the products obtain a more porous structure.This prepared bisporus superabsorbent resin could be used as a core material in many fields,such as pet bedding,water retention agent of soil,and self-curing of concrete,achieving the reuse of biomass waste.
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