缩酮胺合锌催化二氧化碳和氧化环己烯共聚

二氧化碳作为单体与环氧化物的共聚反应近年来越来越受到重视 .该反应不经过高耗能的还原过程 ,二氧化碳利用率高 ,所得到的产物聚碳酸酯在塑料、弹性体、涂料、胶粘剂、食品包装材料和生物降解材料等方面有广泛的应用 .二氧化碳与氧化环己烯的交替共聚物聚碳酸亚环己酯玻璃化转变温度较高 (Ｔｇ 为 1 2 0℃ ) ,热分解温度达 2 1 0℃以上1] ,是一种性能优良的高分子材料 .Ｃｈｅｎｇ等于 1 998年首次报道了一种缩酮胺合锌催化剂2 ] .它是由 β 二酮 (乙酰丙酮 )与 2 ,6 二异丙基苯胺为原料合成的 ,具有西佛碱结构 ,用于二氧化碳与氧化环己…

COPOLYMERIZATION OF CO2 AND CYCLOHEXENE OXIDE CATALYZED BY Zn COMPLEXES WITH KETONE-AMINE CONDENSATES

Two catalyst precursors—DPB ( N,N′ diphenyl 2,3 butadiimine) and PDP ( N phenyl 2,5 dimethyl pyrrole) were synthesized by reactions of diketones and aniline in alcohol. N,N′ diphenyl 2,3 butadiimine and N phenyl 2,5 dimethyl pyrrole were characterized by IR, 1H NMR and MS, and were found to have diimine and substituted pyrrole ring structure, respectively. The condensates N,N′ diphenyl 2,3 butadiimine and N phenyl 2,5 dimethyl pyrrole both were treated with ZnEt\-2 and then with methnol, resulting in Zn complexes with the diketone\|aniline condensates (DPBZn and PDPZn). The two complexes were applied as catalysts for the copolymerization of CO 2 and cyclohexene oxide. One mole of DPBZn and DPDZn may generate 3000 and 16800 g of polymers, respectively. The obtained copolymers were also determined to have CO 2 fractions of 0 424～0 476 (by 1H NMR) and instrinsic viscosity η] of 0 115～0 368?dL/g in chloroform at 30℃.