Journal
EUROPEAN POLYMER JOURNAL
Volume 91, Issue -, Pages 420-428Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2017.04.031
Keywords
Cryogel; Superabsorbent polymers; Zein; Acrylamide; Diesel fuel
Categories
Funding
- Fonds de Recherche du Quebec - Nature et Technologies (FRQNT)
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In this study, zein-protein based cryogels were synthesized by solution-based graft copolymerization of acrylic acid monomers onto zein protein backbones in the presence of an acrylamide crosslinker and initiators (sodium bisulfate and potassium persulfate). The grafting was confirmed by Fourier transform infrared spectroscopy. The thermal properties of the cryogels were assessed by thermogravimetric analysis and their morphology was studied by scanning electron microscopy and Brunauer-Emmett-Teller surface analysis. It was found that freezing the materials using liquid nitrogen at -196 degrees C before drying increased the surface area of the cryogels as compared to freezing at -20 degrees C. Dynamic mechanical analysis tests revealed that cryogels with increased acrylic acid content captured ambient moisture more quickly. The absorption capacity tests were performed in water and in diesel fuel. The highest equilibrium swelling of cryogels in distilled water reached 119.5 g/g of cryogel after 1 h while the highest equilibrium swelling in diesel fuel reached 49.8 g/g of cryogel in 15 min.
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