Accession Number : ADA183894

Title :   Characterization of Surface Structure and Properties in Oriented Polymers.

Descriptive Note : Technical rept.,

Corporate Author : CONNECTICUT UNIV STORRS INST OF MATERIALS SCIENCE

Personal Author(s) : Sung,N H ; Lee,H Y ; Yuan,P ; Sung,C S

PDF Url : ADA183894

Report Date : 24 Jul 1987

Pagination or Media Count : 12

Abstract : 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.

Descriptors :   *POLYETHYLENE TEREPHTHALATE, *POLYMERIC FILMS, *SURFACE PROPERTIES, ANISOTROPY, COEFFICIENTS, FRICTION, DICHROISM, MEASUREMENT, CRYSTALS, MOLECULES, ORIENTATION(DIRECTION), POLYMERS, PARALLEL ORIENTATION, CRYSTALLIZATION, SYMMETRY(CRYSTALLOGRAPHY), MOLECULAR STRUCTURE, PARAMETERS, STRUCTURAL PROPERTIES, SURFACES, INTERFACIAL TENSION, SURFACE ROUGHNESS

Subject Categories : Polymer Chemistry
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE