| 摘要 |
Polyphenylene oxides are prepared by the oxidative coupling of monohydroxy aromatic compounds such as 2,6-xylenol in the presence of copper-bromide-amine catalysts in which at least part of the amine component is a diamine such as N,N'diphenylethylendiamine, N,N'-diphenyl-N,N'-dimethylethylene diamine or N,N'-diphenylpiperazine. Other amines preferably present in the catalyst are a tertiary monoamine such as dimethyl-n-butylamine and a secondary monoamine such as di-n-butylamine. The diamines are characterized by a low rate of consumption during polymerization, and the catalysts prepared therefrom are hydrolytically stable.
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