- ORIGINAL ARTICLE
- Published:
Dynamic viscoelastic properties of wood acetylated with acetic anhydride solution of glucose pentaacetate
Journal of Wood Science volume 49, pages 152–157 (2003)
Abstract
Spruce wood specimens were acetylated with acetic anhydride (AA) solutions of glucose pentaacetate (GPA), and their viscoelastic properties along the radial direction were compared to those of the untreated and the normally acetylated specimens at various relative humidities and temperatures. Higher concentrations of the GPA/AA solution resulted in more swelling of wood when GPA was introducted into the wood cell wall. At room temperature the dynamic Young's modulus (E′) of the acetylated wood was enhanced by 10% with the introduction of GPA, whereas its mechanical loss tangent (tan δ) remained almost unchanged. These changes were interpreted to be an antiplasticizing effect of the bulky GPA molecules in the wood cell wall. On heating in the absence of moisture, the GPA-acetylated wood exhibited a marked drop in E′ and a clear tan δ peak above 150°C, whereas the E′ and tan δ of the untreated wood were relatively stable up to 200°C. The tan δ peak of the GPA-acetylated wood shifted to lower temperatures with increasing GPA content, and there was no tan δ peak due to the melting of GPA itself. Thus the marked thermal softening of the GPA-acetylated wood was attributed to the softening of wood components plasticized with GPA.
Author information
Authors and Affiliations
Corresponding author
Additional information
Received: March 29, 2002 / Accepted: May 21, 2002
Correspondence to:E. Obataya
Rights and permissions
About this article
Cite this article
Obataya, E., Furuta, Y. & Gril, J. Dynamic viscoelastic properties of wood acetylated with acetic anhydride solution of glucose pentaacetate. J Wood Sci 49, 152–157 (2003). https://doi.org/10.1007/s100860300024
Issue Date:
DOI: https://doi.org/10.1007/s100860300024