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合成了一种用于聚酯改性的扩链剂2,2＇-双(2-噁唑啉),探讨了工艺条件对产物收率的影响,并用红外光谱和熔点测定手段对产物进行了表征。实验结果表明,以对甲苯磺酸为催化剂,反应物和带水剂分批加入,原料乙醇与草酸的摩尔比为4:1,中间产物草酸二乙酯的收率可达85％;以乙醇为溶剂,苯为带水剂,2,2＇-双(2-噁唑啉)的总收率可达80％,产品纯度高于98％。
Synthesis of a polyester-modified chain extender 2,2’-bis (2-oxazoline), to explore the process conditions on the yield of the product, and infrared spectroscopy and melting point determination of the product was Characterization. The experimental results showed that the molar ratio of ethanol to oxalic acid was 4: 1 and the yield of diethyl oxalate was up to 85% with p-toluenesulfonic acid as catalyst. As the solvent, benzene is a water-bearing agent, the total yield of 2,2’-bis (2-oxazoline) is up to 80% and the purity of the product is higher than 98%.