Abstract
Following radiation treatment, a number of polyurethane samples were synthesized from hydroxyl-terminated polybutadiene and toluene diisocyanate: the equivalence ratio of NCO/OH was varied over 0–2.0 and the γ-dose over 0–720 kGy. Understanding of the chemical behavior is attempted through the observation of mechanical properties of the solid cross-linked prepolymer. With lower NCO content the ultimate stress increased with dose and the ultimate strain decreased; cross-linking and urethane formation occurred. With higher NCO, allophanate formation predominated. The stress-strain properties were markedly influenced by the presence of a small fraction of additives. A suitable mechanism is proposed.
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