端丙炔酯基环氧乙烷四氢呋喃无规共 醚的 与性能研

To improve the reaction activity of terminated alkynyl, propiolate-terminated ethylene oxide-tetrahydrofuran random copolyether(PTPET)was prepared by esterification between hydroxyl-terminated ethylene oxide-tetrahydrofuran random copolyether(PET)and propargylic acid. The obtained product was characterized by FTIR, NMR, GPC and viscosity tests. Based on the theoretical calculation of terminal alkynyl group value of PTPET, the polytriazole crosslinked polyether elastomer was prepared without catalytic condition, and the mechanical properties of elastomers were preliminarily characterized. From the FTIR analysis of PTPET, the characteristic absorption peak of hydroxyl disappears and the peaks of alkynyl and carbonyl emerge. From the 13C-NMR spectrum of PTPET, the characteristic peak of carbon atom connecting to hydroxyl group completely disappears. At the same time, the characteristic resonance peak of carbon atom related to carbonyl appears. PET terminated hydroxyl is thoroughly esterified to give PTPET. PET end-capping esterification does not affect its relative molecular mass and distribution. The obtained PTPET has higher viscosity in comparison with PET. At room temperature, when the R value is 1, the tensile strength of the elastomer is 0.89MPa, the elongation at break is 189%, and the mechanical properties are good. The propargyl ester terminated polyether with a number average relative molecular mass of about 4000 was successfully prepared. The terminal group of PTPET is conversed completely with theoretical alkyne value of 0.425mmol/g. The improvement of reaction activity was confirmed by the preparation of elastomers without catalytic condition.