Abstract: Thermoplastic polyether-polyurethanes (PEPUs) were prepared by transurethane polycondensation using poly(oxytetramethylene) glycol(PTMG) of M_n=2000,dimethyl-hexane-1,6-dicarbamate(HDC) and 1,4-butanediol(BDO) as raw materials in the presence of organotin or titanate as a catalyst. Effect of catalysts on the structure and property of PEPUs was investigated by fourier transform infrared spectroscopy(FTIR),gel permeation chromatography(GPC),differential scanning calorimetry(DSC),wide-angle X-ray diffraction(XRD),thermogravimetric analysis(TGA), and tests of mechanical and optical properties. The results showed that both organotin and titanate series applied to the transurethane polycondensation synthesizing high-molecular-weight polyether-polyurethanes,and the PEPUs with TET or DBTO as a catalyst showed higher intrinsic viscosities than the ones with TBT,OCT or DBTDL as a catalyst. The PEPU catalyzed by DBTO displayed better mechanical and optical properties in comparison to those catalyzed by DBTDL,OCT or titanate,while the PEPU catalyzed by TET exhibited better thermal properties than those catalyzed by TBT or organotin.

Key words: transurethane polycondensation, organotin, titanate, viscosity, thermal properties

摘要： 采用酯交换缩聚法，以聚四氢呋喃醚二醇（PTMG）和1,6-六亚甲基二氨基甲酸甲酯（HDC）为原料，1,4-丁二醇（BDO）为扩链剂，分别采用有机锡类和钛酸酯类为催化剂制备聚醚型聚氨酯（PEPU）弹性体。用红外光谱（FTIR）、凝胶渗透色谱（GPC）、差示扫描量热（DSC）、X射线衍射（XRD）、热重分析（TGA）、力学性能与光学性能测试等考察有机锡类和钛酸酯类催化剂对聚氨酯结构与性能的影响。结果表明：相同工艺条件下，有机锡类和钛酸酯类为催化剂均能有效催化酯交换缩聚合成高分子量的聚氨酯（PEPU）弹性体，钛酸四乙酯和二丁基氧化锡催化制得PEPU的特性黏度较高。二丁基氧化锡催化制得PEPU的力学性能和光学性能较优，钛酸四乙酯催化制得PEPU热性能较优。

关键词: 酯交换缩聚, 有机锡, 钛酸酯, 黏度, 热性能