以丁二酸、1,4-丁二醇为原料,采用溶液-熔融法合成了不同相对分子质量的聚丁二酸丁二酯(PBS),并研究了4种不同催化剂合成PBS反应的催化性能.采用凝胶渗透色谱(GPC)、傅里叶变换红外光谱(FTIR)、核磁共振氢谱(1H-NMR)、差示扫描量热(DSC)、热重(TG)分析和力学拉伸仪对产物的结构、热稳定性、相对分子质量、力学性能等进行表征.结果表明,不同催化剂催化合成的PBS相对分子质量大小顺序为:对甲苯磺酸>钛酸异丙酯>氯化亚锡>醋酸锌>无催化剂.相对数均分子质量最大值为5.57×104,最小值为2.54×104.所有合成的PBS的热分解温度均大于250℃,都具有较好的热稳定性.其中以钛酸异丙酯和氯化亚锡为催化剂时,得到的PBS具有良好的力学性能.综上结果,钛酸异丙酯为催化剂时合成的PBS最优,相对分子质量为5.50×104,拉伸强度为34.5 MPa,断裂伸长率高达201%.%Poly(butylene succinate) (PBS) products with different relative molecular weights were synthesized using succinic acid and 1,4-butanedioby as materials by solution polymerization-melt polycondensation in presence of catalyst. The catalytic properties of four different catalysts for the synthesis of PBS were studied. The structure,thermal stability,molecular weight and mechanical properties of the products were characterized by GPC,FTIR,1H-NMR,DSC,TG,and mechanical tensor. The experimental results show that the relative molecular weight of PBS prepared by different catalysts:P-Toluenesulfonicacid>Ti(iO Pr)4>SnCl2>Zn(OAc)2>without catalyst. The maximum relative number average molecular weight is 5.57×104 and the minimum is 2.54×104. The thermal decomposition temperatures of all the synthesized PBS are more than 250℃,and all of them have better thermal stability. Among them,the obtained PBS has good mechanical properties using the Ti(iOPr)4 and SnCl2 as catalysts. Based on the above results,PBS synthesized by Ti(iOPr)4 has a molecular weight of 5.50×104,and its mechanical properties are also excellent,the tensile strength is 34.5 MPa, the elongation at break is as high as 201%.
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