The theoretical dependency of the glass transition temperature (Tg) on the degree of polymerization DP is deduced from the theory of the glass transition proposed in the previous paper:The theory agrees well with the experimental data taken from the literature for polystyrene

poly (vinyl chloride)

poly (a-methyl styrene)

poly (dimethyl siloxane) and poly (methyl methacrylate) with various tacticities. The theory leads directly to the relationship between the parameter Kg of the equation (Tg= Tg - Kg/Mn) and the molecular parameters. The agreement between the theoretical predictions and experimental measurments of Kg has been found to be satisfacory for a number of polymers.