Untersuchungen des Reaktionsverlaufes und der Produkte der säurekatalysierten Reaktion von Phenolen mit Holzöl, 2. Vergleichende untersuchungen an verschiedenen phenolen

Abstract

ZUSAMMENFASSUNG:Die zur Herstellung holz6lmodifizierter Phenolharze fur ElektroisolierschichtpreDstoffe wichtige saurekatalysierte Reaktion von Phenolen rnit Holz6l wird fur 4 verschiedene Phenole (Phenol, 0-, m-, p-Cresol) vergleichend untersucht. Insbesondere durch l 3 C-NMR-und IR-Untersuchungen wird festgestellt, da8 ausschliefilich CAlkylierung des Phenols durch HolzOl im Sinne einer Friedel-Crafts-Reaktion abIauft. Die Reaktionsorte an den Phenolen werden ermittelt. Weiterhin werden die Geschwindigkeiten der Reaktion der Phenole mit den Elaostearinsaureresten verglichen. SUMMARY:In this paper the acid-catalysed reaction between phenols and tung oil is investigated for 4 different phenols (phenol, 0-, m-and p-cresol). This reaction is important for the production of modified resins for electrical insulating laminates. In particular by means of I3C-NMR-and IR-method it is proved that phenols are C-alkylated by tung oil in the manner of a Friedel-Crafts-reaction exceptionally. The reaction positions at the phenols are determined. Further, the rates of the reaction of phenol with the eleostearic acid esters are compared for the four different phenols.

Identification of an Original Non-Terpenoid Varnish from the Early 20th Century Oil Painting “The White Horse” (1929), by H. Menzel

“…The phenolic resins appear to react with the drying oil to produce what is essentially a copolymer of the oil and resin − and Ziebarth et al. , have reported on the formation of copolymers between the phenolic resins and tung oil. A nuclear substitution reaction can occur between the para or meta positions of the alkylphenol and the tung oil.…”

High performance bio‐based thermosetting resins composed of tung oil and bismaleimide

“…Electrophilic substitution reactions of phenols with TO in the presence of acid catalyst give crosslinked and/or branched phenol resins. [7][8][9][10] Bio-based polyols prepared by chemical modification of TO can be used to the production of polyurethanes. 11,12 TO can be copolymerized with divinylbenzene and/or styrene by both free radical and cationic polymerizations.…”

Preparation and properties of biocomposites composed of sorbitol‐based epoxy resin, tung oil‐pyrogallol resin, and wood flour

“…The GPE/TA/WF and SPE/TA/WF biocomposites had much higher tensile modulus than the cured GPE/TA and SPE/TA resins, respectively. [21][22][23][24] On the other hand, cardanol is a phenol meta-substituted with a flexible unsaturated hydrocarbon chain, which is derived from cashew nutshell liquid. Therefore, in order to prepare the WF biocomposite with well-balanced tensile properties, it is necessary to use a multifunctional bio-based hardener containing a more flexible unit than TA did.…”