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Characterization of Surface Structure and Properties in Oriented Polymers.
CONNECTICUT UNIV STORRS INST OF MATERIALS SCIENCE
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New surfaces generated during unaxial or biaxial stretching of polymer films are substantially different from their unoriented counterparts. Changes in surface structure have been characterized by measuring molecular orientation and degree of crystallinity using FT-IR ATR dichroism technique. Surface properties, such as surface tension and friction coefficient, are studied by measuring contact angles and by single-stroke friction measurements. Uniaxial drawing increases surface crystallinity and molecular orientation in both polypropylene PP and polyethyleneterephthalate PET. This also leads to anisotropic friction coefficients when measured parallel and perpendicular to the drawing direction. Contact angles measured with four different liquids also exhibit anisotropy in oriented PP and not in PET. Surface roughness of drawn PP is directional whereas that of PET is uniform. And the possible influence of anisotropic roughness on contact angle measurements are carefully examined. Attempts are made to correlate surface properties with surface structural parameters.
APPROVED FOR PUBLIC RELEASE