Determination of In Situ Esterification Parameters of Citric Acid-Glycerol Based Polymers for Wood Impregnation

Marc-Andre Berube, Diane Schorr, Richard J Ball, Veronic Landry, Pierre Blanchet

Research output: Contribution to journalArticle

Abstract

The development of wood treatments is of increasing industrial importance. A novel technique for improving the properties of lodgepole pine and white pine through modification of the microstructure is described. The present investigation is devoted to the synthesis and determination of in situ parameters of citric acid and glycerol based polymers for wood impregnation. This solvent free approach is environmentally friendly and achieved through an esterification condensation reaction under acidic conditions. Crude glycerol and citric acid reactants were cross-linked via a curing process at 160 °C creating a polymer with only water as the byproduct. The ester bonds and crosslinking levels were controlled using different catalysts and citric acid contents and related to the reaction time and temperature. The nature of bonding within the polymers and at the wood cell walls was determined by FT-IR analysis. The thermal properties such as glass transition temperature (Tg) were studied using TGA/DSC and the effect of citric acid content and catalyst type determined. Dimensional stability of impregnated wood samples improved above 50% for each sample with HCl and p-TSA catalysts compared to control samples. FTIR spectra were studied to show the presence of the ester linkages of the polymer in situ at the wood cell walls. Bonding between the polymer and wood macromolecules were observed by scanning electron microscopy and interpreted as evidence of chemical bonds at the wood cells. When prepared using a catalyst, the polymer was intimately incorporated into wood structure significantly improving the substrate dimensional stability. Enhanced stability makes this approach of particular interest for exterior wood products especially as a green renewable option for the wood industry.
LanguageEnglish
Pages970-979
Number of pages10
JournalJournal of Polymers and the Environment
Volume26
Issue number3
Early online date8 Apr 2017
DOIs
StatusPublished - 1 Mar 2018

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Citric acid
Esterification
Glycerol
Impregnation
Citric Acid
Wood
Polymers
Catalysts
Dimensional stability
Esters
Cells
Wood products
Condensation reactions
Chemical bonds
Macromolecules
Crosslinking
Byproducts
Curing
Thermodynamic properties
Microstructure

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Determination of In Situ Esterification Parameters of Citric Acid-Glycerol Based Polymers for Wood Impregnation. / Berube, Marc-Andre ; Schorr, Diane; Ball, Richard J; Landry, Veronic; Blanchet, Pierre.

In: Journal of Polymers and the Environment, Vol. 26, No. 3, 01.03.2018, p. 970-979.

Research output: Contribution to journalArticle

Berube, Marc-Andre ; Schorr, Diane ; Ball, Richard J ; Landry, Veronic ; Blanchet, Pierre. / Determination of In Situ Esterification Parameters of Citric Acid-Glycerol Based Polymers for Wood Impregnation. In: Journal of Polymers and the Environment. 2018 ; Vol. 26, No. 3. pp. 970-979
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