  An approach to modeling the oligomer composition distribution function in the
irreversible step growth homopolymerization process based on a mixture of
oligomers of arbitrary composition is developed. The approach is based on
consideration of probabilities of processes in the system, proceeding on the
principle of P. Flory and obtaining on this basis an infinite system of
differential equations linking mole fractions of each oligomer of a finite
mixture with the degree of transformation.
