摘要:
Polyphenylene oxides of low molecular weight are produced by oxidative polymerization of phenols in the presence of a catalyst and the amount of solvent is limited and the phenols are not added to the reaction medium at one time, but continuously over a certain period of time.
摘要:
Polyphenylene ethers, self-condensation products of phenols, having desired polymerization degree are prepared by a process which comprises terminating the reaction by adding simultaneously at least one member selected from the class consisting of dioxybenzenes and/or benzoquinones and a reducing agent to the reaction medium at the stage of the desired polymerization degree in the oxidative polycondensation of phenols in the presence of a complex catalyst.