Torsional Braid and Infrared analysis were used to examine the curing behavior of a model Polyurethane prepolymer (reaction product of poly ethylene adipate glycol and 2 4-toluene diisocyanate) with a triol (tn methylol propane) and an amine (MOCA). These analytical methods were used to follow the mechanical and chemical conversion of the curing sys tem. The results were interpreted in terms of the formation of "physical" and chemical cross-links. It was concluded that with the triol cure, both chemical and physical cross-links characterize the mechanical conversion of the polymer; with the amine cure, a two-step mechanical conversion mech anism is proposed.
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