The relationship between the basic chemical reactions and morphology de velopment in polyurethane polymers has been studied extensively. Interactions, such as hydrogen bonding, phase separation and chemical crosslinking, play a major role in the matrix formation of the polymer and have a pronounced effect on its processability and ultimate physical and mechanical properties. These interactions are, to a very large degree, controlled by the stoichiometry, relative reaction rates, inherent solubilities and chemical composition of the starting components, as well as the mixing and metering con ditions. A variety of techniques have been used to study the final polymer; very few are adaptable for the study of the dynamics of the reaction injection molding (RIM) process.
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