The Applicability of Aromatic Diamines in the Curing of Polyurethane Prepolymer by Powder Technique

Abstract

The effect of amine structure on the pot-life and the cure-time in the formation of the polyurethane, and on the properties of elastomer, were studied.
Ten kinds of diamine having formula I, or II were used as curative for polyurethane prepolymer:
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As the pK_b, of diamine increases, both rates, the pot-life and the cure-time, became faster. And the properties of elastomer were depended upon the molecular rigidity and the steric hindrance of the ortho-substituent to amino group.