NDLI: Influence of heating history on dynamic viscoelastic properties and dimensions of dry wood

Content Provider	Springer Nature Link
Author	Kojiro, Keisuke Furuta, Yuzo Ishimaru, Yutaka
Copyright Year	2008
Abstract	To obtain new information about the mechanical and physical properties of dry wood in unstable states, the influence of heating history on viscoelastic properties and dimensional changes of dry wood in the radial, tangential, and longitudinal directions was studied between 100° and 200°C. Unstable states of dry wood still existed after heating at 105°C for 30 min and were modified by activated molecular motion in the first heating process to temperatures above 105°C. This phenomenon is thought to be caused by the unstable states reappearing after wetting and drying again. Dry wood components did not completely approach the stable state in the temperature range tested, because they did not entirely surpass the glass transition temperatures in most of the temperature range. In constant temperature processes at 135° and 165°C, E′ increased and E″ decreased with time regardless of the direction. This indicated that the unstable states of dry wood components were gradually modified with time at constant temperatures. On the other hand, anisotropy of dimensional change existed and dimension increased in the longitudinal direction, was unchanged in the radial direction, and decreased in the tangential direction with time at constant temperatures.
Starting Page	196
Ending Page	201
Page Count	6
File Format	PDF
ISSN	14350211
Journal	Journal of Wood Science
Volume Number	54
Issue Number	3
e-ISSN	16114663
Language	English
Publisher	Springer Japan
Publisher Date	2008-05-05
Publisher Place	Japan
Access Restriction	Subscribed
Subject Keyword	Dry wood Unstable state Dynamic viscoelastic property Dimensional change Heating Characterization and Evaluation of Materials Materials Science Wood Science & Technology
Content Type	Text
Resource Type	Article
Subject	Biomaterials Forestry

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