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research article

Chemical investigations on the thermal behaviour of wood during friction welding

Stamm, B.  
•
Windeisen, E.
•
Natterer, Julius  
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2006
Wood Science And Technology

Friction welding is a new technology in the course of which wood pieces are subjected to circular or linear movements in a welding machine. The wood in the contact zone is heated and melted. Aiming at a better understanding of the thermal alteration of wood and the formation of a viscous layer acting as adhesive, the thermally changed material was taken to be analysed by chemical and spectroscopic methods. As a manifestation of thermally splitting of wood, the total amount of extractable compounds within the joint material (JM) is higher than that of unaltered spruce. Cellulose was found less altered than the other essential wood components. Polyoses, on the other hand, are less stable under the conditions of friction welding; they are detectable only in small amounts in the altered zone. Lignin also suffers distinct changes as demonstrated by the increase of free phenolic groups and the decrease of the typical bonds between the phenolpropane units. Furan derivatives were detected within the volatiles of the smoke gas, arising mainly from the polyoses. It is obvious that reactions between furfural and other furan derivatives with lignin belong to the main reactions in the friction zone leading to cross-linking of the JM.

  • Details
  • Metrics
Type
research article
DOI
10.1007/s00226-006-0097-2
Author(s)
Stamm, B.  
Windeisen, E.
Natterer, Julius  
Wegener, G.
Date Issued

2006

Published in
Wood Science And Technology
Volume

40

Start page

615

End page

627

Subjects

Ft-Ir

•

Adhesives

•

Softwood

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
IBOIS  
Available on Infoscience
October 28, 2011
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/72085
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