端磺酰氧基超支化聚酯的合成与优化

Preparation and Optimization of Sulfonyloxy-terminated Hyperbranched Polyesters

在吡啶溶剂中,端羟基超支化聚酯与对甲苯磺酰氯反应,端羟基被端磺酰氧基所取代,制备得到目标产品端磺酰氧基超支化聚酯,并对此目标产物进行了表征。分析结果表明:红外光谱证明了目标产品的端磺酰氧基结构特征,数均相对分子质量1 210,重均相对分子质量1 390,相对分子质量分布1.15。在此基础上,对端磺酰氧基超支化聚酯的合成反应进行了优化。优化结果表明:以吡啶为反应介质,反应温度为25℃,反应时间为12 h,磺酰化试剂(对甲苯磺酰氯)过量程度(加料量/化学反应量)为1.5倍,是制备端磺酰氧基超支化聚酯的最优条件;在优化反应条件下,98.7%的端羟基被端磺酰氧基所取代。

The target product of sulfonyloxy-terminated hyperbranched polyesters was prepared through substitution reaction of paratoluensulfonyl chloride and hydroxy-terminated hyperbranched polyester in pyridine,in which hydroxy-terminated groups were substituted by sulfonyloxy-terminated groups. And the target product was characterized. The results show that structural characters of sulfonyloxy-terminated groups are confirmed in the FT-IR of the products. The molecular weight distribution,number and weight average molecular weights of the product are 1. 15,1 210 and 1 390 respectively. The synthesis reaction of sulfonyloxyterminated hyperbranched polyesters was optimized. The optimal reaction conditions for preparing sulfonyloxyterminated hyperbranched polyesters are as below,the temperature is 25 ℃,the reaction time is 12 h,the ratios of paratoluensulfonyl chloride to hydroxyl groups are 1. 5 and pyridine is used as solvent. In the optimal reaction condition 98. 7% hydroxyl-terminated groups are substituted by sulfonyloxy-terminated groups.