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- W2028720247 abstract "A polyphenylene with reactive nitrile groups has been obtained by co-cyclopolycondensation of the ethyl ketal of p-bromoacetophenone, taken in excess, with the ethyl ketal of p-diacetylbenzene, then replacement of the bromine atoms by nitrile groups by treatment with CuCN. It was found that substitution of CN groups for bromine takes place quantitatively in quinoline. Prepolymers heat treated at 300°C in the presence of ZnCl2 form a crosslinked, heat resistant structure of high softening point. The final polymers do not lose weight when heated in air at 400–430°C and display only slight strain in consistency tests between the plates of a plastometer (specific stress 200 kg/cm2) up to 400–450°C. Polyphenylene prepolymers containing furfurylidene groups became crosslinked at 300°C, but the heat resistance of the final polymers was below that of the polyphenylene with nitrile groups." @default.
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- W2028720247 date "1980-01-01" @default.
- W2028720247 modified "2023-09-27" @default.
- W2028720247 title "Polyphenylenes from ketals of acetyl-aromatic compounds with reactive furfurylidene and nitrile groups" @default.
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- W2028720247 doi "https://doi.org/10.1016/0032-3950(80)90003-9" @default.
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