Development of a bio-based thermo-chemical treatment for wood modification to improve wood properties and promote ist use as building material

Wood should be more promoted as building material but its hygroscopicity constitutes a challenge to overcome because it leads to dimensional instability, mold growth and fungal decay thus service life decrease and necessary maintenance.


  • Departement BFH | Architektur, Holz und Bau
  • Forschungsschwerpunkt Werkstoffe und Holztechnologie
  • Forschungsfeld Holzmodifikation und Oberflächenbehandlung
  • Förderorganisation COST
  • Laufzeit 01.12.2015 - 30.11.2017
  • Projektverantwortung Marion Noël
  • Projektleitung Marion Noël
  • Mitwirkende Projektpartner Forschungsinstitutionen inkl. BFH BFH | Architektur, Holz und Bau
  • Mitwirkende Projektpartner öffentliche Hand COST
  • Schlüsselwörter wood modification, chemical treatment, thermal treatment, biopolyesters, lactic acid, PBS


This process is completely innovative and consists in a bulk impregnation of solid wood with liquid oligomers of polylactic acid or polybutylene succinate. After impregnation, the thermo-treatment step under dry or wet conditions will allow the penetration of the polar polyesters into wood cell wall, and provoke the in-situ further polymerisation. Those compounds are extractable from bio-resources and always more of interest for the biodegradable thermoplastic industry.


By reducing the response of wood to moisture, chemical and thermal modification are two options providing improved performance outdoors. The goal is to combine chemical modifìcation of wood by bio-based polyesters and thermo-treatment.


Combining the best performing polyesters with an additional thermo-treatment, which usually leads to significant decrease of mechanical resistance, will allow to improve significantly the wood outdoor performance.