STRUCTURE OF THE TIE CHAINS IN ORIENTED POLYETHYLENE - DEPENDENCE OF ALL-TRANS STEM LENGTHS ON DRAW RATIO

By the Raman LAM experiments the length distributions of straight all- trans sequences were obtained for oriented polymers films of varied dr aw ratios lambda. A shape of distribution function depended on lambda and draw temperature as well: the higher lambda the more long trans-st ems could be observed in the oriented material. The experimental facts were matched to the results of the computer structure simulation base d on 'stencil crystallization' model which was described previously(1) . Large deviation of experimental data from theoretical ones is discus sed briefly. In essence, this deviation may be considered as a measure of superstructure imperfection of a real oriented polymer. (C) 1997 E lsevier Science Ltd.