Imide siloxane prepolymers were synthesized from ~,o)-anhydride-terminated poly(dimethylsiloxane)s and 4,4'-diphenylmethanediisocyanate. The isocyanate groups were blocked with imidazole or oxime to achieve imide formation by solvent-free condensation at 90°C. The products, which are on average triblock copolymers, were characterized by lH n.m.r., 13C n.m.r, and i.r. spectroscopy.
Посилання на статтю:
Synthesis of imide siloxane prepolymers using blocked isocyanates / Bernhard Stapp and Ursula Endres, Gabriele M6sges and Kurt Geibel // Polymer. – 1992. – Vol 33. – P. 4425-4427.