New method for the synthesis of formaldehyde-free phenolic resins from lignin-based aldehyde precursors. (January 2016)

• Record Type: Journal Article
• Authors: Foyer, G.; Chanfi, B.-H.; Boutevin, B.; Caillol, S.; David, G.
• Is Part Of: European polymer journal. Volume 74(2016:Jan.)
• Page Start: 296
• Page End: 309
• Publication Date: 2016-01
• Subjects: Phenolic resins -- Formaldehyde-free -- Biobased -- Vanillin -- Resol -- Lignin-based; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; Polymerization; Polymers; Periodicals; Electronic journals; 547.705
• DOI: 10.1016/j.eurpolymj.2015.11.036
• Languages: English
• ISSNs: 0014-3057

Abstract

Graphical abstract: Highlights: The synthesis of resol-type phenolic resins without formaldehyde is presented. The functionalization of bio-based phenolic compounds into aldehyde was investigated. Model reaction in the presence of phenol was carried out. The thermo-stability of the obtained bio-based phenolic resins was established. Abstract: Phenolic resins are mainly obtained from phenol and the highly toxic and volatile formaldehyde. In order to synthesize new formaldehyde substituents for the synthesis of resol-type phenolic resins, we designed a method to functionalize phenolic compounds with aliphatic aldehydes by a two-steps reaction: the functionalization of an acetal group on aromatic hydroxyl functions and the subsequent deprotection of theses acetal groups into aliphatic aldehyde groups. This method was used on the lignin-based aromatic aldehyde precursors i.e. 4-hydroxybenzaldehyde and vanillin to turn them into reactive and difunctional biobased aromatic aldehyde precursors. Those precursors proved to lead to formaldehyde-free and biobased phenolic resins with competitive thermal properties compared to the usual formaldehyde resins.