Effect of tensile deformation on the melting point,specific volume,and volume coefficient of expansion of polyethylene

Disks of polyethylene of different density were subjected to plane tensile deformation along eight axes. It was established by volume dilatometry that the melting interval of the deformed plates had been shifted into the region of higher temperatures. It follows from the behavior of the specific volume increment associated with melting that deformation leads to the destruction of some of the low-melting structures and increases the content of higher-melting structures.Lugansk Machine-Building Institute. Translated from Mekhanika Polimerov, No. 6, pp. 1102–1104, November–December, 1970.