中文摘要：

将不同配位方式的稀土羧酸盐/稀土磺酸盐-甘油-二乙基锌两类稀土催化剂用于CO2-PO的共聚合反应,探讨中心金属Y3＋或Zn2＋的缺电子性与催化剂活性的关系.结果表明,磺酸类稀土三元催化体系的活性高于相应的羧酸类稀土催化体系,所得聚合物的相对分子质量分布较宽（11.2-20.6）.1H-NMR表明,萘磺酸钇催化聚合产物中碳酸酯单元含量减少近6%;UV-vis和XPS能谱显示,缺电性增强的中心金属Y3＋或Zn2＋有利于环氧丙烷（PO）和单体的配位活化,产物收率提高30%.此外,配体与中心金属间配位隙孔也是影响催化活性的重要因素,由此推断稀土催化CO2-PO的共聚反应可能是双活性中心过程.

英文摘要：

Sulfonate and carbonate yttrium-based ternary catalysts were employed for the copolymerization of CO2 and epoxide.It has been found that the catalystic activity of sulfonate yttrium-based ternary catalyst is higher than that of the corresponding carbonate ones,and the molecular weight distribution of the copolymers obtained from sulfonate yttrium-based ternary catalyst is broader（11.2~20.6）.1H-NMR spectra shows that the ether unit in the resulting copolymer obtained from the carbonate yttrium-based ternary catalyst is 6% high than of sulfonate yttrium-based ternary catalyst.Based on the ultraviolet visible spectra and X-ray photoelectron spectroscopy（XPS） technique,it seems that the electron deficient of the central metal Y3＋ or Zn2＋,as well as the thicker leap between the central metal and ligand are beneficial to facilitate the insertion of propylene oxide and CO2 to produce polycarbonate,leading a 30% increase of the catalytic activity.A bimetallic active species mode was proposed to interpret this phenomenon.