Abstract
In order to clarify the evolution and role of extractives in thermally modified wood during the process of weathering, the compositions of acetone extractives from thermally modified Scots pine after exposure in an accelerated weathering tester for different durations were determined using gas chromatography-mass spectrometry (GC-MS). Fatty acids and phenolics were proved to be the main types of extractives in weathered thermally modified Scots pine, and some sugars, terpenes and alcohols were also collected. With the progress of weathering, the content of fatty acids decreases significantly while that of phenolics increases. The reduction or even elimination of the fatty acids is presumed to be a physical process, namely, a discharge from wood during exposure to radiation and elevated temperature. The increase of phenolic extractives is mainly due to the photodegradation of other wood components. Phenolic degradation products play the role as a “barrier” against further photodegradation of thermally modified wood, among which vanillin or its derivatives appeared to be the most predominant and important ones.
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: 31570542
Funding source: Fundamental Research Funds for the Central Universities in China
Award Identifier / Grant number: 2015ZCQ-CL-01
Funding statement: The financial support by the National Natural Science Foundation of China (grant no. 31570542) and the Fundamental Research Funds for the Central Universities in China (grant no. 2015ZCQ-CL-01) is gratefully acknowledged
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Employment or leadership: None declared.
Honorarium: None declared.
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Supplementary Material
The online version of this article offers supplementary material (https://doi.org/10.1515/hf-2018-0216).
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