从二氧化碳和环氧丙烷及异氰酸酯合成聚亚氨碳酸酯

研究了二氧化碳，环氧丙烷和异氰酸酯的共聚合反应．并考察了反应条件，异氰酸酯加入量对共聚产率及共聚物的特性粘数、分子量分布及热稳定性的影响．实验发现，引入异氰酸酯具有扩链作用，而引入二异氨酸酯则具有明显的文化交联作用．由共聚物水解试验和光谱研究结果表明，共聚反应生成的是聚亚氨碳酸酯，而不是聚氨基甲酸酯．这种聚亚氨碳酸酯比聚碳酸亚丙酯具有较高的热稳定性．

POLYIMIDOCARBONATES FROM CO2, PROPYLENE OXIDE AND ISOCYANATE

The copolymerization of CO2, propylene oxide (PO) and isocyanates was studied. In this paper, the dependence of the yields, intrinsic viscosity and their distribution as well as thermal stability of the terpolymers on the reaction conditions and isocyanate content were described. The addition of isocyanates resulted in chain extending, branching and crosslinking. The experimental results showed that the copolymerization produced polyimidocarbonates instead of the polyurethanes. The terpolymlers were thermally more stable than the copolymer of CO, and propylene oxide.