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KMID : 1059519950390050421
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Journal of the Korean Chemical Society
1995 Volume.39 No. 5 p.421 ~ p.426
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NMR Relaxation of Water Protons in Hydrophilic Poly(HEMA) Hydrogels
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Sung Yong-Kiel
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Abstract
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The hydrogels of hydrophilic three-dimensional methacrylate polymer networks were prepared from 2-hydroxyethyl methacrylate (HEMA) and ethylene glycol dimethacrylate (EDGMA) in aqueous solution. The interaction of water with the hydrophilic methacrylate polymers in the hydrogels was studied by pulse NMR spectroscopy. The spin-lattice relaxation times (T1) of low water content hydrogels showed the different double environments, resulting in two spin-lattice relaxation times (T1a and T1b). The values of T1a and T1b were 16.4×10-3 sec and 58.2×10-3 sec for a p(HEMA)-(10% H2O) system, and 13.2×10-3 sec and 23.1×10-3 sec for a crosslinked EGDMA-p(HEMA)-(10% H2O) system, respectively. The spin-spin relaxation times (T2) of the hydrogels were also measured as a function of water content in the p(HEMA)-(H2O)n and crosslinked EGDMA-p(HEMA)-(H2O)n system. The values of T2 were approximately 10 times less than those of T1 in agreement with the principles of spin relaxations.
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