Water sorption behavior of CMC/PAM hydrogels prepared by γ-irradiation and release of potassium nitrate as agrochemical |
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| Affiliation: | 1. School of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China;2. Instrumental Analysis Center, Dalian Polytechnic University, Dalian 116034, China;3. School of Biological Engineering, Dalian Polytechnic University, Dalian 116034, China;4. School of Chemical Engineering & Energy Technology, Dongguan University of Technology, Dongguan 528808, China;1. Department of Production Engineering, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, 31270-901 Belo Horizonte, Minas Gerais, Brazil;2. Department of Chemistry, Centro Federal de Educação Tecnológica de Minas Gerais, Avenida Amazonas, 5253, 30421-169 Belo Horizonte, Minas Gerais, Brazil;3. Institute of Exact and Technological Sciences, Universidade Federal de Viçosa, Campus Rio Paranaíba, Rodovia MG 230, 38810-000, Rio Paranaíba, Minas Gerais, Brazil |
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| Abstract: | Novel types of highly swelling CMC/PAM hydrogels have been prepared by grafting cross-linked polyacrylamide (PAM) chains onto carboxymethylcellulose (CMC) via a free radical polymerization method using γ-irradiation. The prepared CMC/PAM hydrogels were characterized by FT-IR spectral analysis. The AM content and irradiation dose had a direct effect on gel content of CMC/PAM hydrogels and inverse effect on their swelling ratio. The hydrogels showed enormous swelling in aqueous medium and displayed swelling characteristics which were highly dependent on the chemical composition of the hydrogel, pH and ionic strength of the medium in which the hydrogel was immersed. The results were supported by morphological properties of CMC/PAM hydrogels by using SEM. The kinetics of water uptake and the water transport mechanism were studied as a function of the CMC/AM ratio into the prepared hydrogel. The release rate of potassium nitrate entrapped within the CMC/PAM matrix increased by enhancing its loading %, and decreased with lowering AM content and irradiation dose. |
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