Hydroxytelechelic polybutadiene, 14.Gelation of a radically obtained hydroxytelechelic polybutadiene with 4,4′‐methylenedi(phenyl isocyanate)

摘要

AbstractA new commercial radically obtained hydroxytelechelic polybutadiene (HTPB‐A) was examined by1H NMR at 500 MHz, and a corrected interpretation of the complex proton methylene resonance of the vinyl‐type primary alcohol was done. The weight‐average hydroxyl functionalityF̄w(OH) was determined by using critical conversions at gel points of the (HTPB‐A + diisocyanate) systems, on the one hand, and swelling at equilibrium on the other. The functionality polydispersity index of HTPB‐A is clos