CP-MAS 13C NMR and FT-IR investigation of the degradation reactions of polymer constituents in wood welding

Delmotte, L.; Ganne-Chédeville, Christelle; Leban, J.M.; Pizzi, A.; Pichelin, Frédéric (2008). CP-MAS 13C NMR and FT-IR investigation of the degradation reactions of polymer constituents in wood welding Polymer Degradation and Stability, 93(2), pp. 406-412. Elsevier 10.1016/j.polymdegradstab.2007.11.020

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The essential chemical modifications involving the polymeric constituents of wood in friction welding occur in the first 5-6 s slowing down or even stopping afterwards. FT-IR and CP-MAS 13C NMR of the welded area of wood have shown dehydration and an apparent increase in the crystallinity of cellulose. A certain level of hemicelluloses degradation occurs, accompanied by the generation of some furfural. Cellulose degradation is instead very slight. Both analytical techniques show an increase in the proportion of lignin in the welding interphase. A proportion of methoxy groups of lignin is de-etherified to phenolic hydroxy groups. Self-condensation of lignin occurs by internal rearrangement with the formation of Ar-Ar and Ar-CH2-Ar bridges. This progresses throughout the whole process of welding. The formation of C-O-C bridges, although stopping after 6 s welding, at the start of wood carbonisation, also appears to contribute to the increase in cross-linking of the lignin network. ?? 2007 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article (Original Article)
Division/Institute:	School of Architecture, Wood and Civil Engineering School of Architecture, Wood and Civil Engineering > Institute for Materials and Wood Technology BFH Centres and strategic thematic fields > BFH Centre for Wood - Resource and Material School of Architecture, Wood and Civil Engineering > Institut for Building Materials and Biobased Products IBBM
Name:	Delmotte, L.; Ganne-Chédeville, Christelle0000-0003-1000-6759; Leban, J.M.; Pizzi, A. and Pichelin, Frédéric0000-0003-3856-6707
Subjects:	Q Science > Q Science (General) Q Science > QD Chemistry T Technology > T Technology (General) T Technology > TJ Mechanical engineering and machinery T Technology > TP Chemical technology
ISSN:	01413910
Publisher:	Elsevier
Language:	English
Submitter:	Christelle Ganne-Chédeville
Date Deposited:	17 Dec 2019 10:09
Last Modified:	12 Jan 2021 21:45
Publisher DOI:	10.1016/j.polymdegradstab.2007.11.020
ARBOR DOI:	10.24451/arbor.9460
URI:	https://arbor.bfh.ch/id/eprint/9460