四氢呋喃均聚醚催化研究进展(续)

Research Progress in Catalytic Synthesis of Polytetrahydrofuran

(接上期第12页) 3.2.2无定型硅酸铝 硅酸铝是经过广泛研究的典型的二元氧化物,固体酸的概念也是通过对硅酸铝的研究而建立起来的.SiO2/Al2O3上的酸中心强度比H0=-8.2还强,且同时具有B酸和L酸2种酸型.20世纪90年代初,ARCO公司的Kahn[60]使用羧酸酐/无定型硅酸铝为催化体系,合成PTMEG.使用的羧酸酐可以是乙酸酐、丙酸酐、邻苯二甲酸酐和马来酸酐.

Different catalyst systems in the cationic ring-opening polymerization of tetrahydrofuran were mainly reviewed. The heterogeneous catalyst systems, especially the heteropolyacid system were described in more detail.