Polyurethanes (PUs) with polyisobutylene (PIB)-diol of Mn = 1900 g/mol, Mw/Mn = 1.8 and chain end functionality Fn = 2 were synthesized using tin-octoate as catalyst. The soft segments (SS) contained PIB-diol or a mixture of PIB-diol and an aliphatic polycarbonate (PC)-diol, and the hard segment (HS) comprised of 4,4'-methylene dicyclohexyl diisocyanate (HMDI) and 1,4-butanediol (BDO). The PU with pure PC-diol made without the use of solvent had 58 MPa tensile strength, but it lost 78.5% strength after ASTM hydrolytic stability testing. The PU with 100% PIB-diol needed solvent during synthesis because of the high viscosity of the mixture. This sample had 15.8 MPa tensile strength and lost 47.7% after hydrolytic stability testing. Optimum performance was found with 30wt% PIB-diol that could be made without the use of solvents and lost only 38% of its ~30 MPa tensile strength after hydrolytic stability testing.

Synthesis of hydrolysis-resistant polyisobutylene-based polyurethanes

255th National Meeting (2018)

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