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).
|Journal||IOP Conference Series: Materials Science and Engineering|
|Publication status||Published - 3 May 2019|
|Event||13th Joint Conference on Chemistry, JCC 2018 - Semarang, Indonesia|
Duration: 7 Sept 2018 → 8 Sept 2018
- Composite gels
- Graft copolymerization
- Water absorbency