Abstract
Hydrogels with high water uptake were prepared by ionizing radiation induced crosslinking in aqueous solutions of four cellulose derivatives (carboxymethylcellulose sodium salt—CMC-Na, methylcellulose—MC, hydroxyethylcellulose—HEC and hydroxypropylcellulose—HPC). The gel fraction increased with absorbed dose, while water uptake decreased. At high polymer concentrations lower gel fractions were found due to the lower polymer chain mobility and inhomogeneity at low water content. The swelling rate gradually slowed down after 4–5 h. CMC and HEC gels reached equilibrium after 24 h, while HPC and MC gels required longer immersion times. Gels showed second-order swelling kinetics in water. The mechanism of the water diffusion proved to be anomalous. In pure water, CMC gels showed the highest, while HPC and MC gels the lowest water uptake. The derivatives had different sensitivities to ionic strength in the swelling solution. The salt type also proved to be a significant factor at uniform ionic strength. Thus different cellulose derivative based gels may be preferred at various applications depending on the environment.
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The authors thank the Hungarian Science Foundation (NK 105802) for partial support, and Eva Horvathne Koczog for technical assistance.
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Fekete, T., Borsa, J., Takács, E. et al. Synthesis of cellulose derivative based superabsorbent hydrogels by radiation induced crosslinking. Cellulose 21, 4157–4165 (2014). https://doi.org/10.1007/s10570-014-0445-6
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DOI: https://doi.org/10.1007/s10570-014-0445-6