Abstract
Abstract A series of one-step urea-urethan cast elastomers has been prepared employing various diisocyanates with 3,3′-dichloro-4,4′-diaminodiphenylmethane and 3,3′-dichlorobenzidine. The effects of diisocyanate structure are not as pronounced as those previously reported for prepolymer systems. Significant variation in stress-strain properties may be obtained, however, depending on the molecular weight and the backbone structure of the polyglycol. A complex catalyst situation, arising from differences in reactivity of the diisocyanates, may also affect these properties considerably as a result of improper balance of reactions during chain buildup. The use of a newly available diisocyanate, “mixed isomer” MDI, which affords high strength elastomers while eliminating safety hazards and cumbersome handling techniques, is also described.
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