The self-diffusion experiment of water was performed across two series of tactic poly(2-hydroxyethyl methacrylate), P(HEMA) membranes, prepared by crosslinking with various amount of hexamethylene diisocyanate (HMDIC). The tagging material was tritium hydroxide (THO) and the efflux of THO was counted on a Liquid Scintillation Counter.
The transport data of THO show that the permeability decreases as the amount of HMDIC increased from 2.5 to 10 mole% and self-diffusion coefficient shows a parallel trend with it. The diffusivity data was compared with the free diffusion data of ordinary water and discussed in terms of the change of water structural orderliness within membranes.
Using the relation between viscosity and diffusivity derived from Eyring's absolute rate theory, the corresponding viscosities of water within two series of tactic P(HEMA) membranes were obtained. From this, it is seen that the viscosities of water within tactic P(HEMA) membranes may have the same values with those of supercooling water whose temperature ranges from -28℃ to -36℃.
생의학적으로 중요한 물질인 tactic poly (2-hydroxyethyl methacrylate )수화겔을 대상으로 투과 실험을 하여 Self-diffusion 계수를 얻었다. 사용한 tracer는 tritium hydroxide (THO) 로서 이것의 유출농도는 Liquid Scintillation Counter 로 측정 하였다.
Crosslinker 로 사용한 hexamethylene diisocyanate (HMDIC) 의 농도가 증가함에 따라 Permeability 값은 점점 감소하는데, 전반적으로 Syndiotactic 수화겔이 isoatactic 수화겔보다 작은 값을 나타낸다.
수화겔의 diffusivity 는 bulk water 에 대한 것보다 10배 정도를 큰 값을 보이고 이로부터 viscosity 를 계산한 결과 수화겔 내에 포함되어 있는 물은 -28℃ - -36℃ 범위의 Supercooling water 과 같은 viscosity 를 가지고 있음을 알았다.
