摘要
Although polyimide (PI) and polyphenylquinoxaline (PPQ) are both heat resistant polymers, their hydrolytic stabilities are quite different. In this paper, the electron densities of two model compounds——N-phenylphthalimide and 2,3-diphenylquinoxaline are calculated by moans of CNDO/2 method. On the other hand, hydrolysis of model compounds and polymers is carried out. The theoretical calculation and experiments both prove that PPQ has excellent hydrolytic stability while PI is completely hydrolyzed under the same experimental condition. The mechanism of hydrolysis is also predicted.
Although polyimide (PI) and polyphenylquinoxaline (PPQ) are both heat resistant polymers, their hydrolytic stabilities are quite different. In this paper, the electron densities of two model compounds——N-phenylphthalimide and 2,3-diphenylquinoxaline are calculated by moans of CNDO/2 method. On the other hand, hydrolysis of model compounds and polymers is carried out. The theoretical calculation and experiments both prove that PPQ has excellent hydrolytic stability while PI is completely hydrolyzed under the same experimental condition. The mechanism of hydrolysis is also predicted.
