关键词: 钛酸四乙酯, 催化剂, 酯交换缩聚, 合成, 聚氨酯, 黏度

Abstract: Thermoplastic polyether polyurethanes (PEPUs) were prepared by a transurethane polycondensation method with poly(oxytetramethylene) glycol (PTMG) as a soft segment,dimethyl- hexane-1,6-dicarbamate (HDC) and 1,4-butanediol (BDO) as hard segments in the presence of tetraethyl titanate (TET). FTIR,GPC,TGA and mechanical and optical property tests were used to characterize the catalytic performance of TET and compare with a standard catalyst of dibutyltin oxide (DBTO) . The effects of synthesis conditions such as polycondensation temperature,polycondensation time,prepolymerization temperature and prepolymerization time on the intrinsic viscosity of PEPUs were discussed by a series of single factor experiments. The results showed that PEPU with TET as a catalyst exhibited better thermal and mechanical properties than PEPU with DBTO as a catalyst did. And the optimal processing conditions were:the prepolymerization reaction was carried out at 110℃ for 45min under a reduced pressure of 0.070MPa and the polycondensation reaction was conducted at 160℃ for 110min under vacuum.

Key words: tetraethyl titanate, catalyst, transurethane polycondensation, synthesis, polyurethane, viscosity