Ai(i-Bu)_3-La(AA)_3-H_2O催化的环氧乙烷聚合作用

Polymerization of Ethylene Oxide Under the Catalysis of Al(i-Bu)_3-La(AA)_3-H_2O

详细研究了在 Al( i - Bu) 3- La( AA) 3- H2 O的催化下环氧乙烷的均聚反应和与环氧丙烷的共聚反应情况 .实验发现在该催化剂的作用下 ,以甲苯为反应介质 ,在 n [Al( i - Bu) 3]∶ n [La( AA) 3]为 1 6～ 1 0 ,n [Al( i- Bu) 3]∶ n [H2 O]为 1∶ ( 1～ 3) ,n (单体 )∶ n [La( AA) 3]为 1 0 0 0∶ ( 1～ 3) ,n (单体 )∶ n [Al( i - Bu) 3]为 1 0 0∶ ( 1～ 3) ,45℃预聚 2 h,85～ 90℃聚合 1 0 h的条件下 ,催化剂的活性高 ,聚合速率大 ,所得产物的平均相对分子质量高 .以水为溶剂 ,在 30℃测得环氧乙烷均聚物的 Mv=31 0× 1 0 4 ;在 m (环氧乙烷 )∶ m (环氧丙烷 )为 1 95∶ 1 5时 ,其共聚物的 Mv=380×1 0 4 。

The ring opening homopolymerization of ethylene oxide and the copolymerization of ethylene oxide and propylene oxide are studied under the catalysis of Al(i Bu) 3 La(AA) 3 H 2O. The ratioes of the reactants are n(Al(i Bu) 3∶n(La(AA) 3)=1∶(6～10),n(monomer)∶n(Al(i Bu) 3∶n(H 2O)=1∶(1～3),n(monomer)∶n(La(AA) 3)=1000∶(1～3),n(monomer)∶n(Al(i Bu) 3)=100∶(1～3).When pre polyreaction carries out 2h at 45℃ and polyreaction carries out 10h at 85~90℃, the catalyst has high activity, there is great reaction rate, and the products of the polymerization have great average relative molecular mass v . v  of the homopolymer and copolymer are 310×10 4 and 380×10 4 at 30℃ separately when water is used as solvent and n(ethylene oxide)∶n(propylene)=195∶15.