Low Odor Eco-Friendly Polyurethane Trimerization Catalyst Developments: A Comprehensive Review Abstract: Polyurethane (PU) materials are ubiquitous in modern society due to their versatility and wide range of applications. The trimerization reaction, forming isocyanurate rings, is a crucial process in the synthesis of many PU foams, coatings, and adhesives, imparting improved thermal stability, chemical resistance, and...