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

Munier, Leo F.; Franke, Tom; Herold, Nadine; Pfriem, Alexander (2020). Humidity's Effect on the Dynamic-mechanical Behavior of Phenol-formaldehyde Impregnated Beech Wood Veneer BioResources, 15(1), pp. 1563-1574.

[img]
Preview
Text
16403-61469-1-PB.pdf - Published Version
Available under License Publisher holds Copyright.

Download (887kB) | Preview

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.

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
School of Architecture, Wood and Civil Engineering > Institute for Materials and Wood Technology > Wood Modification
BFH Centres > BFH Centre for Wood - Resource and Material

Name:

Munier, Leo F.;
Franke, Tom;
Herold, Nadine and
Pfriem, Alexander

Subjects:

Q Science > QC Physics
T Technology > T Technology (General)
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TH Building construction
T Technology > TP Chemical technology
T Technology > TS Manufactures

Language:

English

Submitter:

Christelle Ganne-Chédeville

Date Deposited:

26 Apr 2021 15:31

Last Modified:

23 Oct 2021 02:18

Uncontrolled Keywords:

DMTA Humidity sweep Phenol-formaldehyde Plasticization Veneer modification

ARBOR DOI:

10.24451/arbor.14670

URI:

https://arbor.bfh.ch/id/eprint/14670

Actions (login required)

View Item View Item
Provide Feedback