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Licensed Unlicensed Requires Authentication Published by De Gruyter December 15, 2016

Characteristics and thermal decomposition kinetics of wood-SiO2 composites derived by the sol-gel process

  • Ke-Chang Hung and Jyh-Horng Wu EMAIL logo
From the journal Holzforschung


Wood-SiO2 composites (WSiO2Cs) were prepared by means of the sol-gel process with methyltrimethoxysilane (MTMOS) as a reagent, and the physical properties, structure and thermal decomposition kinetics of the composites has been evaluated. The dimensional stability of the WSiO2Cs was better than that of unmodified wood, especially in terms of the weight percent gain (WPG), which achieved values up to 30%. The 29Si-NMR spectra show two different siloxane peaks (T2 and T3), which supports the theory about the formation of MTMOS network structures. Thermal decomposition experiments were also carried out in a TG analyzer under a nitrogen atmosphere. The apparent activation energy was determined according to the iso-conversional methods of Friedman, Flynn-Wall-Ozawa, modified Coats-Redfern, and Starink. The apparent activation energy between 10 and 70% conversion is 147–172, 170–291, 189–251, and 192–248 kJ mol−1 for wood and WSiO2Cs with WPGs of 10, 20, and 30%, respectively. However, the reaction order between 10 and 70% conversion calculated by the Avrami theory was 0.50–0.56, 0.35–0.45, 0.33–0.44, and 0.28–0.48. These results indicate that the dimensional and thermal stability of the wood could be effectively enhanced by MTMOS treatment.

Award Identifier / Grant number: NSC 102-2628-B-005-006-MY3

Funding statement: This work was financially supported by a research grant from the Ministry of Science and Technology, Taiwan (NSC 102-2628-B-005-006-MY3).


This work was financially supported by a research grant from the Ministry of Science and Technology, Taiwan (NSC 102-2628-B-005-006-MY3).


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Received: 2016-8-12
Accepted: 2016-11-10
Published Online: 2016-12-15
Published in Print: 2017-3-1

©2017 Walter de Gruyter GmbH, Berlin/Boston

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