二氧化碳和环氧丙烷、环氧乙烷三元共聚物的合成与表征

Synthesis and Characterization of Terpolymer Polycarbonates from Propylene Oxide and Ethylene Oxide with Carbonate Dioxide

利用负载二元羧酸锌催化剂在不添加任何溶剂的情况下进行二氧化碳和环氧丙烷、环氧乙烷的共聚反应,合成了降解材料三元共聚物聚甲基乙撑-乙撑碳酸酯。利用凝胶渗透色谱法、红外光谱、核磁氢谱和碳谱、热分析等对其结构和热性能进行了表征。结果表明,这些三元共聚物主链上具有较高的碳酸酯键含量和较高的分子量,与二元共聚物相比,热学性能没有明显的改变,5%失重温度(TGA-5%)高于250℃。

The terpolymerization of propylene oxide （PO） and ethylene oxide （EO） with carbon dioxide （CO2） using supported zinc glutarate was investigated in this study. The IR and NMR spectra indicate that the resulting terpolymer with high molecular weight is indeed a polycarbonate. MDSC reveals that incorporation of EO reduces the Tg of the terpolymers significantly. TGA results show that the terpolymers exhibit an extremely high decomposition temperature above 250 ℃.