SHISH-KEBAB STRUCTURE IN INJECTION-MOLDED POLYETHYLENE

The quantitative parameters of fine space organization of shish-kebabs in injection moulded PE with average molecular weight 182 x 10(3) and 478 x 10(3) are measured by combining the SAXS and the low-frequency Raman spectroscopy methods. It was shown that the subsurface layer doe s not exhibit any qualitative difference as compared with the inner re gions, but the linear dimensions of both central and side crystallites , as well as long period, are smaller near the outer border than in th e bulk. Indirect data pointed out the significant concentration of rot ational defects in central rods which decreases with an increase of mo lecular weight.