The self-diffusion experiment of THO was performed across a series of copolymer hydrogels at different temperatures. Copolymer hydrogels were prepared by copolymerizing 2-hydroxyethyl methacrylate(HEMA) and 2-aminoethyl methacrylate(AEMA) in the presence of the solvent and the crosslinker ethylene glycol dimethacrylate (EGDMA).
By changing the crosslinker content and the ratio of HEMA and AEMA monomer, two series of copolymer hydrogel were synthesized. The tagging material was THO and efflux of THO was counted on a Liquid Scintillation Counter.
The experimental data show that the permeability decreases as the amount of EGDMA and the mole fraction of HEMA increase, and the permeability is proportional to the temperature.
The partition coefficient shows a parallel trend except in the temperature. The partition coefficient is inversely proportional to the temperature. So the self-diffusion coefficient show a parallel trend with the permeability.
Using the relationship between viscosity and diffusivity derived from Eyring's absolute rate theory, the corresponding viscosity of water within the membrane was obtained.
The results derived from the relationship between temperature and viscosity show that the viscosity of water within the membrane may have the same value with those of supercooling water whose temperature ranges from 25.0℃ to -32.42℃.
From the diffusivities, Arrhenius plots were performed and show the activation energy for self-diffusion of water through the membrane. The results show that the activation energy ranges from 6.93 Kcal/mole to 10.58 Kcal/mole.
일련의 공중합수화겔에서 THO 자체확산계수의 측정실험을 여러 온도에서 실시하였다. 공중합수화겔은 2-hydroxyethyl methacrylate와 2-aminoethyl methacylate를 crosslinker ethylene glycol dimeth-acrylate의 존재하에서 공중합 시켜서 만들었다. 투과용질로는 THO를 사용하였다. 실험결과로부터 permeability는 EGDMA의 양과 HEMA의 몰분율이 증가함에 따라 감소하였고 분배계수와 자체확산계수도 permeability와 같은 경향을 나타냄을 알았다. 점도와 자체확산계수의 관계로부터 수화겔 안에 있는 물의 점도를 계산하였고 이것이 몇 도에 해당하는 과냉각수인가를 알아내었다. 또한 자체확산계수와 온도의 관계로부터 투과현상에서의 활성화 에너지도 계산하였다. 이것으로부터 EGDMA와 HEMA의 물분율이 증가할수록 점도와 활성화 에너지가 증가함을 알았다.