Rheokinetics of ring‐opening metathesis polymerization of norbornene‐based monomers intended for self‐healing applications

Abstract

Constant shear rate rheokinetics was used to evaluate the polymerization of four norbornene-based monomer systems as candidate healing agents in self-healing composites: endo-dicyclopentadiene (endo-DCPD), exo-DCPD, 5-ethylidene-2-norbornene (ENB), and a 1:1 volume mixture of endo-DCPD:ENB. The ruthenium catalyst induced ring-opening metathesis polymerization of the healing agent candidates were measured experimentally under isothermal conditions while the influences of several different variables were considered (e.g., test temperature, catalyst concentration, catalyst form). Analyzing the increase in viscosity during the polymerization, comparisons of the reaction kinetics of the different monomers were quantified by defining two parameters, t t and ⌬t, which correspond to the polymerization initiation and propagation rates respectively. Generally, ENB shows the fastest polymerization kinetics, and endo-DCPD the slowest.

Self-healing polymeric materials based on microencapsulated healing agents: From design to preparation

“…In addition to DCPD, ENB has also been examined as a potential candidate for the polymerizable monomer of a two-component healing agent based on the ROMP mechanism owing to its rapid polymerization and lower Grubbs' catalyst loading requirements [110,[230][231][232][233][234][235][236].…”

MMA bulk polymerization and its influence on in situ resin viscosity comparing several chemorheological models

“…Recent reviews have treated dynamic conversion in bulk radical polymerization, [1][2][3] and specific models have been developed for polypropylene, 4 polyphenylene oxide, 5 polymethyl methacrylate (PMMA), [6][7][8] other acrylates, 9 polyamides, 10 epoxies, 11 norbornenes, 12,13 and low density polyethylene, 14,15 with the focus on plant efficiency and safety. 16,17 Similar rheological assessments during chemical reaction have also been performed with reactive extrusion.…”

Two layer structure for reinforcing pothole repair

“…We have identified a polymeric material, dicyclopentadiene (DCPD) nano molecular resin [6,7] to strengthen the pothole repair materials [8,9]. We take the approaches of utilizing the low viscosity characteristic of the DCPD resin, which is controllable from similar to water to very viscose, to infiltrate the asphalt-aggregate mixtures.…”