Preparation of Rigid Polyurethane-imide Foams

摘要

A novel rigid polyurethane thermosetting foam is synthesized via the reaction of isocyanate terminated polyimide prepolymers with poiyether polyol(4110), and deionized water and n-pentane are used for blowing agents simultaneously. The prepolymers and polymers are characterized by conventional methods and -NCO conversion rate, characteristic structure and morphology are also studied. The results show that the optimal condition of polymerization of polyimide prepolymers is under 60 °C for 30min. FTIR data show that the imide groups have been achieved successfully. The rigid polyurethane-imide foams prepared by this technique possess the cell diameter ranging from 1.5mm to 2.5mm and bubbles distributing equably.