Abstract
An expression for the ratio of the glass transition temperature to the melting temperature, Tg/Tm, was derived with allowance for fluctuations of the packing factor in the amorphous state. This relationship made it possible to describe the actual range of variation in Tg/Tm depending on a change in the packing factor in the crystalline state ko, cr. The proposed approach forms the basis for the method of determination of increments in the packing ratio ko, cr and formulation of the principles of selection of experimental data for calculations. The glass transition temperatures in polyethylene depending on the type of unit cell were calculated.
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