Structure-property relationships for model heterocyclic polymer networks: Effect of monomer functionality

摘要

The effect of initial monomer functionality on the final properties of densely crosslinked heterocyclic polymer networks (HPN) was evaluated from comparative studies of the viscoelastic behavior and enthalpy relaxation in the glass transition range of polyisocyanurates prepared from a bifunctional monomer D (1,6-hexamethylene diisocyanate, HDI) and a trifunctional monomer T (the isocyanurate of HDI). Quantitative analysis, of these data suggested that an HPN prepared from the monomer T was chemically more heterogeneous and possessed a lower effective network density (presumably, as a result of a lower mobility of the initial monomer T compared to monomer D).