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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 39, Number 5
JKCSEZ 39(5)
October 20, 1995 

 
Title
NMR Relaxation of Water Protons in Hydrophilic Poly(HEMA) Hydrogels
Author
Yong Kiel Sung
Keywords
Abstract
2-hydroxyethyl methacrylate (HEMA)와 ethylene glycol dimethacrylate (EDGMA)로부터 수용액중에서 친수성 3차원 메타아크릴레이트 고분자 망상의 수화겔을 제조하여 NMR 분석법에 의해 그 친수성 메타아크릴레이트와 물 사이의 상호작용에 대하여 연구하였다. 적은 양의 물을 함유하고 있는 수화겔의 스핀-격자 이완시간(T1)을 측정한 결과 물 양성자 주위의 다른 두 환경에 따른 T1a 와 T2b 가 나타났다. Poly(2-hydroxyethyl methacrylate)[p(HEMA)]-(10% H2O) 수화겔에 대한 T1a 와 T1b 가 각각 16.4×10-3 sec 와 58.2×10-3 sec 이고, 가교된 EGDMA-p(HEMA)-(10% H2O) 수화겔에 대한 T1a 와 T2b 가 각각 13.2×10-3 sec 와 23.1×10-3 sec 이었다. 또한 수화겔들에 대해 스핀-스핀 이완시간(T2)를 측정한 결과 p(HEMA)-(H2O)n 및 가교된 EDGMA-p(HEMA)-(H2O)n의 계에 T2값은 물 함량이 증가함에 따라 증가하였다. T2값들은 T1의 값들보다 약 10배 작게 나타나고 스핀이완원리와 일치하였다.

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.

Page
421 - 426
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