Humidity's Effect on the Dynamic-mechanical Behavior of Phenol-formaldehyde Impregnated Beech Wood Veneer

  • The dynamic-mechanical behavior of phenol-formaldehyde-impregnated beech wood (Fagus sylvatica L.) veneers was evaluated at various relative humidities. The aim was to identify the plasticizing effects of moisture on phenol-formaldehyde-impregnated veneers. Thin beech veneer samples were impregnated with a low and a medium molecular weight phenol- formaldehyde resin. The measurements were performed with a dynamic- mechanical thermal analysis equipped with a humidity generator. The storage modulus and the loss factor of the uncured phenol-formaldehyde- impregnated and the untreated control veneers were determined at a relative humidity of 15%, 60%, and 85% and a constant temperature of 25 °C. The untreated control veneers exhibited the smallest reduction of the normalized storage modulus. In contrast, the phenol-formaldehyde- impregnated samples exhibited a more intense relative reduction of the storage modulus with increasing relative humidity. This effect was more distinct for samples impregnated with low molecular weight phenol-The dynamic-mechanical behavior of phenol-formaldehyde-impregnated beech wood (Fagus sylvatica L.) veneers was evaluated at various relative humidities. The aim was to identify the plasticizing effects of moisture on phenol-formaldehyde-impregnated veneers. Thin beech veneer samples were impregnated with a low and a medium molecular weight phenol- formaldehyde resin. The measurements were performed with a dynamic- mechanical thermal analysis equipped with a humidity generator. The storage modulus and the loss factor of the uncured phenol-formaldehyde- impregnated and the untreated control veneers were determined at a relative humidity of 15%, 60%, and 85% and a constant temperature of 25 °C. The untreated control veneers exhibited the smallest reduction of the normalized storage modulus. In contrast, the phenol-formaldehyde- impregnated samples exhibited a more intense relative reduction of the storage modulus with increasing relative humidity. This effect was more distinct for samples impregnated with low molecular weight phenol- formaldehyde than for those impregnated with medium molecular weight phenol-formaldehyde. In addition, higher solids contents in the resins led to even smaller normalized storage modulus. Consistently, the loss factor indicated a greater softening of the samples with an increasing humidity and higher solids content of the phenol-formaldehyde.show moreshow less
Metadaten
Author:Leo Felix MunierORCiD, Tom Franke, Nadine HeroldGND, Alexander PfriemORCiDGND
URN:urn:nbn:de:kobv:eb1-opus-3841
DOI:https://doi.org/10.15376/biores.15.1.1563-1574
Parent Title (English):BioResources
Document Type:Article
Language:English
Year of Completion:2020
Year of first Publication:2020
Publishing Institution:Hochschule für nachhaltige Entwicklung Eberswalde
Release Date:2023/03/09
Tag:DMTA, Humidity sweep, Phenol-formaldehyde, Plasticization, Veneer modification
Issue:15(1)
First Page:1563
Last Page:1574
Note:
Offizielle URL: https://bioresources.cnr.ncsu.edu/resources/humiditys-effect-on-the-dynamic-mechanical-behavior-of-phenol-formaldehyde-impregnated-beech-wood-veneer/
Institutions / Departments:Fachbereich Holzingenieurwesen
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften / 629 Andere Fachrichtungen der Ingenieurwissenschaften
open_access (DINI-Set):open_access
University Bibliography:University Bibliography
Zweitveröffentlichung
Peer-Review / Referiert
Licence (English):License LogoThis Journal uses their publisher’s own license
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