Effect of temperature on the orientational drawing of polyethylenes of different molecular weight

The effect of orientation temperature on the strength of high pressure polyethylene films of Mw=(65−150) × 103 and degree of polydispersion 2·7–7·0 is studied. It is established that a 10–20 K increase in temperature after necking gives a 14–45% increase in the strength of specimens of fairly high molecular weight (Mw=150 × 103, Mw/Mn=4·0) and moderate MMD (Mw = 84 × 103, Mw/Mn = 5·6; Mw = 140 × 103, Mw/Mn = 7·0). Orientational drawing of low...