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Monitoring Wood Degradation during Weathering by Cellulose Crystallinity
Materials, 2012-10, Vol.5 (10), p.1910-1922
[Peer Reviewed Journal]
Copyright MDPI AG 2012 ;2012 by the authors. 2012 ;ISSN: 1996-1944 ;EISSN: 1996-1944 ;DOI: 10.3390/ma5101910
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Title:
Monitoring Wood Degradation during Weathering by Cellulose Crystallinity
Author:
Lionetto, Francesca
;
Del Sole, Roberta
;
Cannoletta, Donato
;
Vasapollo, Giuseppe
;
Maffezzoli, Alfonso
Subjects:
cellulose
;
crystallinity
;
Fourier transform infrared (FT-IR)
;
lignin
;
outdoor weathering
;
pine wood
;
wood coatings
;
wood degradation
;
X-ray diffraction (XRD)
Is Part Of:
Materials, 2012-10, Vol.5 (10), p.1910-1922
Description:
The degree of crystallinity of cellulose was used for assessing the degradation level of coated and uncoated samples of pine wood after weathering. X-ray diffraction (XRD) and Fourier Transform Infrared (FT-IR) spectroscopy measured the changes in the surface crystallinity of cellulose resulting from weathering, both natural and artificial. Both techniques revealed an increase in the crystallinity index (CI) of cellulose when wood was subjected to weathering. An increase in the size of crystallites was also observed by XRD measurements. These results were related to the reduction of the amorphous fractions of wood, and, consequently, to the enrichment of the relative crystalline content. Thanks to FT-IR analysis, the degradation of hemicellulose was observed for uncoated samples after exposure to artificial weathering. The effect of weathering was less evident on coated samples because of the protective action of the coating. A good correlation between the crystallinity indexes obtained from FT-IR and XRD was found. The experimental results proved that the proposed method may be a very useful tool for a rapid and accurate estimation of the degradation level of wood exposed to weathering. This methodology can find application in the field of conservation and restoration of wooden objects or in the industry of wood coatings.
Publisher:
Basel: MDPI AG
Language:
English
Identifier:
ISSN: 1996-1944
EISSN: 1996-1944
DOI: 10.3390/ma5101910
Source:
GFMER Free Medical Journals
PubMed Central
ROAD: Directory of Open Access Scholarly Resources
ProQuest Central
DOAJ Directory of Open Access Journals
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