Journal
POLYMER DEGRADATION AND STABILITY
Volume 94, Issue 12, Pages 2184-2193Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2009.09.003
Keywords
Beech (Fagus sylvatica L.); Chemical degradation; Heat-treatment; Mass loss; Norway spruce (Picea abies L.); Scots pine (Pinus sylvestris L.)
Categories
Funding
- The National Council for Science and Technology (CONACYT), Mexico [178663]
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Heat-induced weight loss (WL) and chemical and dimensional changes of small specimens of beech (Fagus sylvatica L.), Scots pine (Pinus sylvestris L) and Norway spruce (Picea abies L) wood were examined after thermal modification in the 190-245 degrees C temperature range. Treated specimens exhibited reductions in their oven-dry weight in line with the severity of the treatment, with the effect of increasing the temperature of exposure being greater than extending the period of treatment. Wood polysaccharides were found to be distinctly more labile than the lignin constituent; the latter increased possibly as a result of repolymerisation reactions trapping some degradation products in the process. Specimens shrank in the transversal plane in a tangential to radial ratio of 2:1 regardless of the treatment regime, while their length increased marginally for WL < 10-12%. It is proposed that the thermal modification leaves the cell wall material in a permanent strained state. (C) 2009 Elsevier Ltd. All rights reserved.
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