Studies on the effect of curing conditions on the curing rate and mechanical properties of moisture-cured poly(urethane-urea) elastomers containing oligocarbonate segments

摘要

In this paper the results of studies on the effect of the curing conditions on the mechanical properties, appearance and curing rate of poly(urethane-urea) elastomer (PURE) obtained by moisture-curing of the corresponding urethane prepolymer (URE) synthesized from isophorone diisocyanate (IPDI) and oligocarbonate diol (OCD) are presented. OCD was synthesized from dimethyl carbonate and 1,6-hexanediol. A designed experiment was conducted where two parameters [curing temperature (T_c—X1) and relative air humidity (RH—X2)] were changed at the same time according to the standard 2~2 model. The results were analyzed by Statistica computer programme and were presented in the form of XrX2 graphs. The graphs were produced for a set of Y parameters characterizing the properties of PURE (mechanical properties, curing rate and sample appearance). The Y = f(X1, X2) eauations were also obtained. The results showed the distinct dependence of the curing rate and PURE properties on curing parameters and allowed to select a range of optimum curing conditions.