FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W1965745825> ?p ?o ?g. }

• W1965745825 endingPage "1079" @default.
• W1965745825 startingPage "1070" @default.
• W1965745825 abstract "Abstract Summary: A new reaction procedure has been developed for the polycondensation of hexafluorobisphenol A (6F‐BPA) with bis(pentafluorophenyl) ketone (BPK) in dimethylacetamide (DMAc). In this reaction, CaH 2 has been used as a base to facilitate the formation of the phenolate; an alkali metal fluoride was used as a catalyst. Unlike the conventional polycondensation reactions, this procedure avoided producing water during the reaction, and hence, azeotropic distillation with the assistant of a low‐polar co‐solvent is not required. This improvement maintains the high polarity of the reaction medium; consequently, the selectivity of the reaction at the para ‐position of BPK is significantly enhanced and polymers with high molecular weights ( $overline M _{rm n}$ ca. 30 000 Da) can be obtained with very low branching contents (less than 3 mol‐%) and free of any cross‐linked gel particles. In addition to avoiding the formation of water in the reaction, the use of CaH 2 also reduced the concentration of the fluoride ion in the solution. These effects minimize chain degradation reactions such as hydrolysis. The use of CaO instead of CaH 2 for this reaction produces similar effects. In the case of CaO, traces of water can be introduced into the reaction. The presence of trace amounts of water increases the polycondensation rate, probably due to the enhanced ionization of the phenolate. However, it also causes a hydrolysis of polymer chains, resulting in the elimination of the ketone group in the polymer backbone. Fortunately, this side reaction is highly water and temperature dependent, and can be efficiently prevented by using CaH 2 or conducting the reaction at a lower temperature (<65 °C). CaH 2 ‐mediated polycondensation for the preparation of highly fluorinated poly(arylene ether ketone). image CaH 2 ‐mediated polycondensation for the preparation of highly fluorinated poly(arylene ether ketone)." @default.
• W1965745825 created "2016-06-24" @default.
• W1965745825 creator A5004661287 @default.
• W1965745825 creator A5020748987 @default.
• W1965745825 creator A5047350600 @default.
• W1965745825 creator A5083992153 @default.
• W1965745825 date "2004-05-01" @default.
• W1965745825 modified "2023-10-17" @default.
• W1965745825 title "Highly Fluorinated Poly(arylene ether ketone) Prepared by a CaH2-Mediated Polycondensation Reaction" @default.
• W1965745825 cites W1964622535 @default.
• W1965745825 cites W1967242619 @default.
• W1965745825 cites W1979486515 @default.
• W1965745825 cites W2011459471 @default.
• W1965745825 cites W2012777009 @default.
• W1965745825 cites W2013199370 @default.
• W1965745825 cites W2041081818 @default.
• W1965745825 cites W2056386601 @default.
• W1965745825 cites W2059342908 @default.
• W1965745825 cites W2061085511 @default.
• W1965745825 cites W2074025120 @default.
• W1965745825 cites W2081474738 @default.
• W1965745825 cites W2084349388 @default.
• W1965745825 cites W2086865010 @default.
• W1965745825 cites W2089761622 @default.
• W1965745825 cites W2107822628 @default.
• W1965745825 cites W2155857611 @default.
• W1965745825 cites W2161298844 @default.
• W1965745825 cites W2235258987 @default.
• W1965745825 cites W4244196579 @default.
• W1965745825 doi "https://doi.org/10.1002/macp.200400016" @default.
• W1965745825 hasPublicationYear "2004" @default.
• W1965745825 type Work @default.
• W1965745825 sameAs 1965745825 @default.
• W1965745825 citedByCount "20" @default.
• W1965745825 countsByYear W19657458252015 @default.
• W1965745825 countsByYear W19657458252016 @default.
• W1965745825 countsByYear W19657458252019 @default.
• W1965745825 crossrefType "journal-article" @default.
• W1965745825 hasAuthorship W1965745825A5004661287 @default.
• W1965745825 hasAuthorship W1965745825A5020748987 @default.
• W1965745825 hasAuthorship W1965745825A5047350600 @default.
• W1965745825 hasAuthorship W1965745825A5083992153 @default.
• W1965745825 hasBestOaLocation W19657458252 @default.
• W1965745825 hasConcept C161790260 @default.
• W1965745825 hasConcept C178790620 @default.
• W1965745825 hasConcept C179104552 @default.
• W1965745825 hasConcept C185592680 @default.
• W1965745825 hasConcept C188027245 @default.
• W1965745825 hasConcept C2777738585 @default.
• W1965745825 hasConcept C2779843779 @default.
• W1965745825 hasConcept C2780263894 @default.
• W1965745825 hasConcept C2780407432 @default.
• W1965745825 hasConcept C2780471494 @default.
• W1965745825 hasConcept C2780828025 @default.
• W1965745825 hasConcept C2781076698 @default.
• W1965745825 hasConcept C38087914 @default.
• W1965745825 hasConcept C44228677 @default.
• W1965745825 hasConcept C521977710 @default.
• W1965745825 hasConcept C53033327 @default.
• W1965745825 hasConcept C94412978 @default.
• W1965745825 hasConceptScore W1965745825C161790260 @default.
• W1965745825 hasConceptScore W1965745825C178790620 @default.
• W1965745825 hasConceptScore W1965745825C179104552 @default.
• W1965745825 hasConceptScore W1965745825C185592680 @default.
• W1965745825 hasConceptScore W1965745825C188027245 @default.
• W1965745825 hasConceptScore W1965745825C2777738585 @default.
• W1965745825 hasConceptScore W1965745825C2779843779 @default.
• W1965745825 hasConceptScore W1965745825C2780263894 @default.
• W1965745825 hasConceptScore W1965745825C2780407432 @default.
• W1965745825 hasConceptScore W1965745825C2780471494 @default.
• W1965745825 hasConceptScore W1965745825C2780828025 @default.
• W1965745825 hasConceptScore W1965745825C2781076698 @default.
• W1965745825 hasConceptScore W1965745825C38087914 @default.
• W1965745825 hasConceptScore W1965745825C44228677 @default.
• W1965745825 hasConceptScore W1965745825C521977710 @default.
• W1965745825 hasConceptScore W1965745825C53033327 @default.
• W1965745825 hasConceptScore W1965745825C94412978 @default.
• W1965745825 hasIssue "8" @default.
• W1965745825 hasLocation W19657458251 @default.
• W1965745825 hasLocation W19657458252 @default.
• W1965745825 hasOpenAccess W1965745825 @default.
• W1965745825 hasPrimaryLocation W19657458251 @default.
• W1965745825 hasRelatedWork W1990128883 @default.
• W1965745825 hasRelatedWork W1994520037 @default.
• W1965745825 hasRelatedWork W2055919548 @default.
• W1965745825 hasRelatedWork W2089785151 @default.
• W1965745825 hasRelatedWork W2100800742 @default.
• W1965745825 hasRelatedWork W2965061072 @default.
• W1965745825 hasRelatedWork W3203682463 @default.
• W1965745825 hasRelatedWork W4231360702 @default.
• W1965745825 hasRelatedWork W4237127130 @default.
• W1965745825 hasRelatedWork W2008934211 @default.
• W1965745825 hasVolume "205" @default.
• W1965745825 isParatext "false" @default.
• W1965745825 isRetracted "false" @default.
• W1965745825 magId "1965745825" @default.
• W1965745825 workType "article" @default.