Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Self-Diffusion of THO within Tactic Poly(2-hydroxyethyl methacrylate) Membranes

  • Kim, Hye-Kyeong (Department of Chemistry, Korea Advanced Institute of Science and Technology) ;
  • Jhon, Mu-Shik (Department of Chemistry, Korea Advanced Institute of Science and Technology)
  • Published : 1983.06.20
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Abstract

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 the self-diffusions coefficient shows a parallel trend with it. The diffusivity data was discussed in terms of the change of water structural orderliness within membranes. Using the relation between viscosities and diffusivities 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 viscosity of water within tactic P(HEMA) membranes may have the same values with those of supercooling water whose temperature ranges from -28 to -$36^{\circ}C.$.

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