作　　者： ; ; ; ; ;

机构地区： 中山大学物理科学与工程技术学院能源与环境材料研究所

出　　处： 《高分子材料科学与工程》 2007年第4期32-35,共4页

摘　　要： 系统考察了以负载戊二酸锌为催化剂的二氧化碳(CO2)和环氧丙烷(PO)共聚反应体系中添加不同含量的杂质水、乙醇和丙醛分别对催化效率、反应产物组成及含量和共聚物结构、分子量及其分布等结果的影响。结果显示,乙醇的存在显著降低催化效率,水和丙醛次之。1H-NM R及13C-NMR表明,所得聚合物为聚碳酸丙烯酯(PPC),且三种添加物对共聚物分子链中碳酸酯结构单元含量影响不大,都在49%以上。GPC测试表明三种添加物都不同程度地降低了PPC的分子量,同时使分子量分布变宽。副产物环碳酸丙烯酯(POC)及聚醚(PE)的含量都随添加量的增加而增加。 The copolymerization of CO2 and propylene oxide was performed using supported zinc glutarate catalyst, and the influence of additives, including trace water content, ethanol and propanal contents on the catalytic activity of supported zinc glutarate was exclusively investigated. Moreover, the composition and molecular structure of the resulting copolymers were studied accordingly. The experimental results demonstrate that the catalytic activity decreases obviously in the presence of trace ethanol and water. ^1H-NMR and ^13C-NMR spectra reveal that the alternating copolymer is resulted, and the discussed additives show no effect on the carbonate linkage content in the copolymer. However, the all additives can decrease molecular weight and increase molecular weight distribution determined via GPC. Finally, with increasing impurities, the byproduct content, i.e. , propylene carbonate increases as indicated by GPC measurements.

关 键 词： 二氧化碳 碳酸丙烯酯 聚碳酸丙烯酯 水 乙醇 丙醛

领　　域： [化学工程]