Abstract: Copolymerized polyether-polyurethane elastomers (CEUs) are prepared by transesterification polycondensation method with castor oil-based polyoxyethylene ether (EL),polyoxytetramethylene glycol (PTMG) and 1,6-dimethylhexane dicarbamate (HDC) as raw materials,dibutyltin dilaurate as catalyst,and 1,4-butanediol as chain extender.EL and PTMG are used as the soft segment,and HDC is used as the hard segment.The properties of CEUs are characterized by IR,TGA and mechanical performance tests.Effects of the material ratio,the temperature,time and pressure in pre-polymerization stage,and the temperature and time in polycondensation stage on the mechanical properties of CEUs are investigated by a series of single factor experiments.The results show that the optimum conditions are determined as follows:n(EL)∶n(PTMG)=1∶5,n(soft segment)∶n(hard segment)=1∶1.07,the temperature,time and pressure are 110℃,45 min and 0.03 MPa in the pre-polymerization stage,and the temperature and time 170℃ and 180 min in the polycondensation stage.The CEUs prepared under the optimum conditions has a tensile strength of 3.23 MPa,an elongation at break of 972.38%,and a Shore A hardness of 60.
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