A method is outlined to study the structure property relationship in semicrystalline fibers involving (a) the characterization of structure in terms of the two phase amorphous-crystalline model (size, concentration and orientation of the crystallites, etc.), (b) the analysis of viscoelastic responses in terms of Takayanagi models, and (c) the analysis of diffusion assuming that crystals are essentially impermeable to large dye molecules. The method, which does not require an accurate estimate of the properties of a #x201C;completely#x201D; amorphous polymer, is applied to a series of oriented nylon 6 fibers. The study, which confirms the validity of the derived equation to describe the diffusion process in semi-crystalline polymers above the glass transition temperature, leads to a quantitative representation of the #x201C;efficiency#x201D; of crystal reinforcement as a function of the degree of crystallinity.
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