Time-temperature superposition for kinetic mapping of solventless autocatalytic addition of diisocyanates and macrodiols.

ABSTRACT: The migration of chemicals from polyurethane (PUR) is a concern in many applications, such as adhesives for food packaging. Low molecular weight catalysts, which are prone to migration, need to be eliminated from PUR, in particular those containing Sn or other metals. This is difficult partly due to many uncertainties of autocatalytic polyaddition between isocyanates and polyols. Hexamethylene and tolylene diisocyanates, HDI and TDI, are often reacted with macrodiols to produce prepolymers for PUR. This study measures isocyanate contents during the polyaddition of HDI and TDI with excess macrodiols. Ester-based macrodiols were reacted between 60 °C and 90 °C using 1 : 0.3 and 1 : 0.5 molar ratios to form OH-terminated prepolymers. Time-temperature superposition (TTS) was used to process th

SUBMITTER: Asadauskas SJ 

PROVIDER: S-EPMC10037676 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature