聚环氧丙烷与氧的接触电荷转移复合物及其暗氧化降解

聚醚已被广泛应用于聚合物及生物材料的制备和改性，如聚乙二醇（ＰＥＧ）已在生物、医学等许多领域获得应用［１］．但是聚醚容易被氧化，并导致分子量降低，因此影响由它制备的聚合物的性能［２］．人们对聚醚的光氧化及氧化降解已有许多报道［３，４］，然而缺少对聚醚...

THE OXYGEN-CONTACT CHARGE TRANSFER COMPLEX OF POLY(PROPYLENE OXIDE) AND ITS DARK OXIDATIVE DEGRADATION

The contact charge transfer (CCT) complex can be formed between poly(propylene oxide)(PPO) as an electron donor and oxygen as an electron acceptor.A reversible CCT absorption appears at 226 4nm due to their very weak combination.The result shows that without initiator and in the dark,the oxidation of PPO goes through the initial state of O 2 CCT as same as the oxidation of its model compound isopropyl ether.It is proposed that the initial dark oxidation of PPO undergoes through O 2 CCT,CTC,H + transfer,free radicals in cage,and the formation of hydroperoxide.The hydroperoxide is the primary product of dark oxidation and its subsequent decomposition results in the chain cleavage with decrease of the molecular weight of PPO.