Synthesis and characterization of composite gels starch-graft-acrylic acid/bentonite(St-g-AA/B)using N'N-methylenebisacrylamide(MBA)

摘要

Composite gels are three-dimensional hydrophilic polymer networks that can absorb high amount of water,and eco-friendly.In this study,composite gels starch-graft-acrylic acid/bentonite(St-g-AA/B)was successfully synthesized by graft copolymerization using starch as natural polymer and bentonite.The acrylic acid that neutralized 40% parts with NaOH was used in copolymerization process.The graft copolymerization process uses potassium persulfate(KPS)as a free radical initiator and N,N-Methylenebisacrylamide(MBA)solution as a crosslinker.The synthesis process was conducted at 70°C for two hours under nitrogen atmosphere.Factor influencing of water absorbency such as amount bentonite in the weight and volume ratio were investigated.The results show that composite gels starch-graft-acrylic acid/bentonite(St-g-AA/B)had an optimum bentonite value of 2 %wt acrylic acid with water absorbency obtained were 205.94 g/g and 157 mL/mL.The graft copolymerization reaction was characterized by Fourier Transform Infrared Spectroscopy(FTIR)and morphological structure of product was evidenced by Scanning Electron Microscopy(SEM).