Crafts Polymerization Research Articles

Friedel–Crafts polymerization of fluorene with methylene chloride, methoxyacetyl chloride, and chloromethyl methyl ether

AbstractThe polymerization of fluorene with various chloromethylating reagents (methylene chloride, methoxyacetyl chloride, and chloromethyl methyl ether) in the presence of aluminum chloride was studied. The products that were obtained were insoluble, infusible, colored powders which contain a low concentration of aromatic radicals. Each of the polymers is composed predominantly of fluorene nuclei bridged at the 2 and 7 positions by methylene groups. In addition, the materials possess varying amounts of crosslinked and ring‐fused moieties. Based on physical and spectral properties and reaction stoichiometry, the fluorene/methylene chloride polymer is the most highly crosslinked of the three. The fluorene/methoxyacetyl chloride and fluorene/chloromethyl methyl ether polymers are similar to each other in most respects.

Biphenylene End-Capped Polyaromatics

Abstract Biphenylene end-capped polyquinoline pre-polymers (DP = 3,11 and 22) were melt processed in the presence of a nickel catalyst at 325–340°C under 500 psi to give high quality transparent films. Very short cure times (∼ 5 min) were realized, and the resulting films were insoluble, had increased Tg's, and showed improved mechanical properties both above and below the Tg as compared with the uncured resins. The main curing reaction is a chain extension by the conversion of the biphenylene ends to tetrabenzocyclooctatetraene, while a smaller amount of crosslinking takes place. Biphenylene end-capped polyimide, poly(keto-ether-sulfone) and polyphenylquinoxaline pre-polymers also were synthesized. The polyimide pre-polymer (DP=3) was melt processed at 325°C and 500 psi (Ni catalyst) for 15 min to give films that showed good mechanical properties. Friedel Crafts polymerization to yield the biphenylene end-capped poly(keto-ether-sulfone) could not be adequately controlled to give reproducible oligomers. P...

Inhibition of Friedel—Crafts Polymerization1. I. The Mechanism of Inhibition

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInhibition of Friedel—Crafts Polymerization1. I. The Mechanism of InhibitionJ. George, H. Wechsler, and H. MarkCite this: J. Am. Chem. Soc. 1950, 72, 9, 3891–3896Publication Date (Print):September 1, 1950Publication History Published online1 May 2002Published inissue 1 September 1950https://doi.org/10.1021/ja01165a018RIGHTS & PERMISSIONSArticle Views149Altmetric-Citations11LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (544 KB) Get e-Alerts Get e-Alerts

Friedel–Crafts Polymerization

ON July 5–7, a symposium on Friedel–Crafts polymerization was held in the Chemical Laboratory, Trinity College, Dublin, under the chairmanship of Prof. M. G. Evans. Papers by Drs. F. S. Dainton, M. H. Dilke, D. D. Eley, A. G. Evans, S. D. Hamaen, G. W. Meadows, D. C. Pepper, F. T. Perkins, P. H. Plesch and A. W. Richards were discussion revealed the scarcity of quantitativ information in this field, but resulted in appreciable clarification of a number of obscure points. A clear picture of the reaction mechanisms emerged, which should be of value as a guide to future work.