Mechanical Properties of Modified Hydroxyl-Terminated Polybutadiene Based Polyurethane

The epoxidized hydroxyl-terminated polybutadiene(EHTPB) with different epoxide number was prepared by peroxide acetic acid in situ.EHTPB based polyurethane was prepared by curing with diisocyanates(toluene-diisocyanate(TDI),isophorone-diisocyanate(IPDI) and 4,4-dicyclohexylmethane-diisocyanate(H12MDI),and chain extender 1,4-butanediol(BDO)).Its structure was also analyzed by infrared spectroscopy and scanning electron microscopy(SEM).Results show that H12MDI is a better solidified agent for improving mechanical properties of polyurethane.The optimal epoxide number of EHTPB is about 0.18 mol·(100 g)-1.Mechanical properties of polyurethane can be improved by adding extender BDO.The optimal content of BDO is that the mole ratio of —OH(BDO) /—OH(EHTPB) is 1-2.The experimental results indicate that EHTPB/H12MDI/BDO based polyurethane has the highest mechanical properties.