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).

theories. Empirical studies observe behaviors for gas-polymer systems and then correlate these findings to known phenomenological models. Based on the focus of these empirical studies, either microscopic (molecular) or macroscopic (continuum) theories are employed (6). Theory of Gas Permeation and Diffusion Through Polymer Membranes Fundamentals

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