Novel Furfural-Derived Polyaldimines as Latent Hardeners for Polyurethane Adhesives.

ABSTRACT: Moisture-curing one-component polyurethane systems in adhesive, sealant, and coating applications may show blister formation upon cure. Blisters can be formed when carbon dioxide, generated in the reaction with isocyanate and water, is trapped in the film. This problem can be mitigated by employing latent hardeners such as blocked polyamines, which are activated upon moisture exposure. The hydrolysis of the latent hardener yields the polyamine that quickly reacts with the isocyanate, forming urea linkages, and then chain extends the polymer. The hydrolysis also releases the blocking agent, which can potentially create an unpleasant odor. In this work, a series of di- and trifunctional aldimines were synthesized from commercially available polyamines, biobased hydroxymethyl furfural, and la

SUBMITTER: Turel T 

PROVIDER: S-EPMC10859888 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature