The Kinetic Approach Basic Aspects

Due to the complex nature of the macromolecular systems, theoretical models of the reaction mechanism are very difficult to buUd. In many cases, empirical models based on the experimental results obtained in any given conditions are implemented 

Before building a semiempirical model, several basic aspects must be observed. First of all, for classical low molecular weight reactants the same reactivity for each individual molecule can be assumed because they must be almost identical. In the case of macromolecular reactants, like polypropylene, the existence of a molecular weight distribution makes this assumption invalid (38). However, the conversion in terms of modified and unreacted or unmodified macromolecules is not a trivial measurement. 

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