Summary
The rates of urethane formation between linear and three-arm star hydroxyl-terminated polyisobutylenes (PIB-diols and -triols) and 4,4′-diphenylmethane diisocyanate (MDI) have been studied in the presence of triethylene diamine and stannous octoate catalysts in chlorebenzene at 25°C. The second order rate constants were determined and compared with those obtained with various polyether triols, hydroxyl-terminated polybutadiene and hydroxyl-terminated polyolefin. The rates of the normalized PIB-diol/MDI and PIB-triol/MDI reactions are essentially identical. In the presence of triethylene diamine, the rates of the PIB-diol and PIB-triol/MDI reactions are the same or much higher than that of the polyether-triol/MDI reaction. In contrast, in the presence of stannous octoate, the rates of the PIB-diol and PIB-triol/MDI reactions are much slower than that of the polyether-triol/MDI reaction. Differences in catalytic pathways are invoked to explain these observations. The reactivities of hydroxyl-terminated PIBs are similar to those of other hydroxyl-terminated polyhydrocarbons and sufficient for the synthesis of foams.
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Ako, M., Kennedy, J.P. Polyisobutylene-based urethane foams. Polymer Bulletin 19, 137–143 (1988). https://doi.org/10.1007/BF00257006
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DOI: https://doi.org/10.1007/BF00257006