Transcription of Chapter 4. Permeability, Diffusivity, and Solubility of ...
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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).
Henry’s law of solubility, equation (6), states that a linear relationship exists between the external vapor pressure and the corresponding concentration within the surface of the plastic sheet or membrane (8). The relationship in equation (6) is commonly extrapolated from a linear sorption isotherm. If one assumes the
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