Chapter 4. Permeability, Diffusivity, and Solubility of ...

29 Chapter 4. permeability , Diffusivity, and Solubility of Gas and Solute Through Polymers Introduction The diffusion of small molecules into polymers is a function of both the polymer and the diffusant. Factors which influence diffusion include: (1) the molecular size and physical state of the diffusant; (2) the morphology of the polymer; (3) the compatibility or Solubility limit of the solute within the polymer matrix; (4) the volatility of the solute; (5) and the surface or interfacial energies of the monolayer films (1-4). Researchers have attempted to explain specific mechanisms by which diffusion occurs in polymeric systems, but there is no unified theory to explain this phenomenon (5). Formulation of the gas transport phenomena through polymer membranes is directed in two areas: (1) development of quantitative theories based on the thermodynamics and kinetic properties of the gas-polymer system, and (2) experimental study of gas transport through various polymers.

permeation coefficient, and the solubility coefficient simplifies to: (8). P = D⋅S. (13) In closing, if the rate of diffusion is empirically determined and the solubility coefficient for the diffusant is known, the permeation and diffusion coefficients are …

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  Solubility, Permeability, And solubility

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