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.…
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): | This Journal uses their publisher’s own license |