The sequence structure and crystallization behavior of the ethylene oxide-tetrahydrofuran random copolymer,P( E-co-T),were investigated by the quantitative13 C-NMR spectra,WAXD,and DSC. The thermostat polyurethane elastomers were prepared with P( E-co-T) copolyether,and the network structure and mechanical properties of the resultant polyurethane elastomers were studied. Based on the quantitative13 C-NMR,the existence of the micro-blocks[THF]n( n≥3) in P( E-co-T) chains was determined,and the content of [TH...