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성용길,고대유 대한의용생체공학회 1988 의공학회지 Vol.9 No.1
N-n-Propylacrylamide는 n-propyl bromide와 acrylamide로 부터 합성하였고, 합성된 N-n-propylacrylamide를 THF용매속에서 개시제로 AIBN을 사용하여 $60^{\circ}C$에서 acrylamide와 공중합시켰다. 그리고 합성된 단량체와 공중합체는 NMR과 IR에 의하여 확인하였다. N-n-Propylacrylamide has been synthesized from acrylamide and n-propyl bromide. N -n Propylacrylamide was copolymerized with acrylamide at $60^{\circ}C$ in tetrahydrofuran using ${\alpha},{\alpha}'$-azobisisbutyronitrile as initiator. The synthesized monomer and copolymers have been identified by NMR and FT-lR spectrophotometer. The swelling properties of the crosslinked homopolymers were investigated at different temperatures. Three types of hydration layer around the back-bone structure of gels were determined. The thermal properties of copolymers were also measured by differential scanning calorimeter and thermogravimetry. As the amounts of N-n-propylacrylamide are increased, the enthalpic changes associated with endothermic transition and glass transition of the copolymers are decreased. As the amount of N-n-propylacrylamide is increased, the thermal stability is increased. The activation energies of thermal decomposition and dehydration for the poly (acrylamide-co-N -n-propylacrylamide) have been evaluated by Freeman and Carroll's method. As the amounts of N-n- propylacrylamide are increased, the activation energies of thermal decomposition and dehydration are increased.
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NMR Relaxation of Water Protons in Hydrophilic Poly(HEMA) Hydrogels
성용길,Sung, Yong Kiel Korean Chemical Society 1995 대한화학회지 Vol.39 No.5
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${\times}$10-3 sec and 58.2${\times}$10-3 sec for a p(HEMA)-(10% H2O) system, and 13.2${\times}$10-3 sec and 23.1${\times}$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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成墉吉,李春基,金恩植,朴冠鎬 동국대학교 재료과학연구소 1982 材料科學硏究所 論文集 Vol.2 No.-
Poly(2-hydroxyethyl methacrylate) 수화겔막을 통한 알칼리금속 염화물의 투과현상을 전기투석법을 이용하여 연구하였다. 친수성 수화겔막은 가교제 ethyleneglycol dimethacrylate(EGDMA), 단량체 2-hydroxyethyl methacrylate(HEMA) 및 중합개시제 azobismethylisobutyrate(AMIB)를 사용하여 45%(V/V) H_2O 중에서 중합 제조하였다. 제조된 poly(2-hydroxyethyl methacrylate)막에 대한 알카리금속 염화물 LiCl_2, NaCl, KCl 등의 투과현상은 일정한 전압에서 전기투석기속에서 관측되었으며, 투과된 용질의 농도 측정분석은 볼꽃광도계법을 이용하였다. 측정된 투과량과 양이온의 겉보기직경, 용질의 자체확산계수 및 용액중의 양 이온의 수송수를 비교 검토하고 poly(2-hydroxyethyl methacrylate) 수화겔막에 대한 나트륨이온(Na^+)의 선택성 여부를 조사검토 하였다. The transport phenomena of alkali metal chlorides through poly(2-hydroxyethyl methacrylate) hydrogel membrane have been studied using electrodialysis. The hydrogel membranes were prepared by the polymerization of 2-hydroxyethyl methacrylate in the presence of 45%(V/V) H_2O and ethyleneglycol dime-thacrylate. The initiator used in the polymerization was azobismethylisobutyrate (AMIB) prepared from azobisisobutyronitrile(AIBN) using Mortimer method. The permeability of alkali metal chlorides such as LiCl, NaCl and KCl at 50 voltage was obtained. The permeability of NaCl was also observed at 30, 40, 50, and 60 voltages respectively. The concentration of solutes permeated through the membrane was measured by flame photometry. The experimental results have been discussed with the comparison of apparent solute molecular size, the self-diffusion coefficient of solutes, and the transport number of cations in aqueous solution. These indicates that poly(2-hydroxyethyl methacrylate) hydrogel membrane shows a specific selectivity for sodium ion.
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