Abstract
Thermoresponsive hydrogels based on N-isopropylacrylamide, N-tertiary butylacrylamide (NTBA) and methacrylamide (MAAm) have been prepared by free radical copolymerization in water–dioxane mixture. Fourier transform infrared spectroscopy confirmed the presence of all monomers in the hydrogel system. Scanning electron microscopy revealed that the hydrogel having higher amount of NTBA had more smooth structure compared to others. Differential scanning calorimetry results showed that the free and interfacial water decreased but bound water increased with NTBA content in the hydrogel. Dynamic mechanical analysis results revealed increased storage modulus for the hydrogel having higher content of N-tertiarybutylacrylamide. Swelling studies of the hydrogels at different temperatures showed that all samples followed Fickian type of diffusion. The diffusion coefficient increases with increase in MAAm proportion in the hydrogel. The hydrogels were used in concentrating aqueous bovine serum albumin solution. The separation efficiency of hydrogels having higher content of MAAm were found up to 80 % at 5 °C but it decreased upon raising the temperature up to 30 °C.
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Acknowledgments
The authors are grateful to acknowledge the Central Instrumentation Facility (CIF) at Birla Institute of Technology, Mesra established in 2006 in Technical Education Quality Improvement Programme (TEQIP) funded by World Bank for the state-of-the-art Instrumentation facility. The authors also acknowledge the financial support from Central Coir Research Institute (CCRI), Ministry of Micro, Small and Medium Enterprises (MSME) (Government of India), Allapuzha, Kerala, India.
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Shekhar, S., Mukherjee, M. & Sen, A.K. Swelling, thermal and mechanical properties of NIPAM-based terpolymeric hydrogel. Polym. Bull. 73, 125–145 (2016). https://doi.org/10.1007/s00289-015-1476-3
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DOI: https://doi.org/10.1007/s00289-015-1476-3