Cure characterization and viscosity development of ring-opening metathesis polymerized resins

Abstract

The ring-opening metathesis polymerization (ROMP) kinetics of three different norbornene-based monomers, ethylidene norbornene (ENB), endo-dicyclopentadiene (DCPD) and exo-DCPD, in the presence of Grubbs’ catalyst are examined using differential scanning calorimetry and rheokinetic viscosity measurements. Several different parameters were considered, such as, the monomer healing agents (including different monomer mixtures), the catalyst concentration, and test temperature to determine how these parameters influence cure development. The polymerization kinetics, quantified by exothermic peak locations in the case of differential scanning calorimetry and rheokinetic transition times in the case of viscosity measurements, are shown to be highly dependent on monomer type and catalyst concentration. The ENB monomer had the fastest kinetics even at the lowest catalyst concentration compared to the other diene monomers and mixtures.