and addition polymerization) processes
A review of kinetic methods used to the description of processes of the condensation polymerization on an example of the preparation of urea-formaldehyde resin and in a broader range of the addition polymerization on an example of the polyurethanes (PUR) manufacturing technology was presented. The simplest models were discussed with an assumption that the essence of the step-growth polymerization process is based exclusively on reactions between functional groups. Relationships obtained on the basis of these models were presented and their suitability for the process control was indicated from the point of receiving an optimum conversion degree under given conditions and of producing materials with different crosslinking degrees. The problems and advantages resulting from the elaboration of more complex models were discussed. These models enable to calculate various molecular parameters of PUR (its chemical composition and molecular weight distribution).
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