| Abstract: | Polyurethane elastomers derived from 4,4'-methylene bis(phenyl isocyanate), butylene glycol and the lowoxyethylene moiety content copolyether of tetrahydrofuran and ethylene oxide, obtained by copolymerization usingheteropolyacid-ethylene oxide initiator system, were prepared. The polyurethanes exhibited an increased water absorptionand much better low temperature resilience, which remained high even at a temperature of -3℃, while that of polyurethanebased upon poly(tetramethylene ether) glycol of the same molecular weight,i.e. being 2000,and molecular weight distribution,i.e.in the range of 1.4-1.5,starts to decrease dramatically at 5℃. |
