Abstract
A series of uniaxially drawn films of isotactic polypropene and ethene-propene random copolymer was prepared. The differences in the crystal orientation between the bulk and the surface layer were examined using wide-angle X-ray diffraction and grazing incidence X-ray diffraction techniques. It was found that the c-axis orientation of the surface layer is almost identical with that of the bulk. The magnitude in the b-axis of the polypropene films decreased with increasing draw ratio. The changes in the b-axis at the bulk were found to be greater than those at the surface layer.
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