聚碳酸酯在乙二醇中的可控醇解

Controllable Glycolysis of Polycarbonate in Ethylene Glycol

为了实现聚碳酸酯(PC)的有效回收和循环利用,以乙二醇为醇解剂,醋酸锌为催化剂,二氧六环为溶剂,用溶液法对PC进行降解反应。利用34正交实验研究反应温度、反应时间、醋酸锌及乙二醇用量对PC醇解反应的影响程度。考察反应温度、反应时间、PC重复链节与乙二醇物质的量比、催化剂及溶剂的类型和用量等条件对PC醇解行为的影响。通过傅里叶红外光滑和黏度法对产物进行分析。正交设计实验的直观和方差分析得出四个因素对PC醇解反应的影响顺序为:反应温度>反应时间>乙二醇用量>醋酸锌用量,通过设定特定的条件,得到不同摩尔质量的产物,实现PC的可控醇解。

In order to achieve the effective recychng and cyclic utilization of polycarbonate （ PC）, with ethylene glycol （EG） as the glycolysis agent, zinc acetate as the catalyst and dioxane as the solvent, the glycolysis experiments of PC were conducted by solution method. The effects of reaction temperature, reaction time, amount of zinc acetate catalyst and amount of EG on the glycolysis of PC were discussed by 3^4 orthogonal design. The experiment parameters such as temperature, reaction time, molar ratio of PC repeat unit to EG, the type and dosage of solvent and catalyst were also examined. The glycolysis products were analyzed by Fourier transfer infrared spectrometer and viscometer. The visual and variance analysis showed the sequence of the main effects on the glycolysis of PC in descending order was： reaction temperature 〉 reaction time〉amount of EG〉amount of zinc. The results also indicated that the controllable glysolysis of PC which got products with different molecular weight could be achieved by setting specific reaction conditions.