Influence of isomerism of difluorobenzophenone on the synthesis and properties of poly(arylene ether ketones)статья
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Дата последнего поиска статьи во внешних источниках: 24 октября 2016 г.
Аннотация:The influence of isomerism of difluorobenzophenone on the efficiency of polycondensation and the properties of homo- and copoly(arylene ether ketones) was studied. The latter were prepared by the reaction of 2,4'- and 4,4'-difluorobenzophenone with potassium diphenolates of bisphenol A and phenolphthalein in N,N-dimethylacetamide. A high content of ail admixture of the 2,4'-isomer in 4,4'-difluorobenzophenone decreases the molecular weight of related poly(arylene ether ketones) and has no substantial effect on their glass transition temperature.