Journal article
Correlation of mechanical and chemical cure development for phenol–formaldehyde resin bonded wood joints
Thermochimica acta, Vol.513(1), pp.20-25
2011
Handle:
https://hdl.handle.net/2376/115253
Abstract
In this study a relationship between the chemical and mechanical degree of cure (i.e.
α and
β, respectively) is investigated for a standard phenol–formaldehyde resin (PF). Dynamic mechanical analysis (DMA) is conducted on PF-bonded wood joints under various isothermal and linear heating regimes. Model free kinetics (MFK), viz Friedman, Vyazovkin and Kissinger–Akhira–Sunnose algorithms, are assessed for predicting the mechanical cure kinetics of PF. All MFK algorithms are found to provide a good description of PF mechanical cure. In parallel, chemical cure of the same PF samples is assessed with differential scanning calorimetry (DSC) under the same heating regimes. The relationship between chemical and mechanical degree of cure is thus obtained and observed to follow a sigmoid curve, which is best modeled with a two-parameter Weibull cumulative distribution function. The sensitivity of mechanical cure with respect to chemical cure
dβ/
dα is also evaluated. A maximum in sensitivity is systematically observed at the vitrification point. The models developed in this study should be useful for incorporating information on the chemical and mechanical cure kinetics of adhesives in hot-pressing models and other processing models.
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Details
- Title
- Correlation of mechanical and chemical cure development for phenol–formaldehyde resin bonded wood joints
- Creators
- Jinwu Wang - Department of Forest Products, Mississippi State University, P.O. Box 9820, Mississippi State, MS 39762-9820, USAMarie-Pierre G Laborie - Institute of Forest Utilization and Works Science, Albert-Ludwig University of Freiburg, Werthmannstr. 6, 79086 Freiburg, GermanyMichael P Wolcott - Composite Materials and Engineering Center, Department of Civil and Environmental Engineering, Washington State University, P.O. Box 541806, Pullman, WA 99164, USA
- Publication Details
- Thermochimica acta, Vol.513(1), pp.20-25
- Academic Unit
- Composite Materials and Engineering Center; Office of Clean Technology
- Publisher
- Elsevier B.V
- Identifiers
- 99900548208101842
- Language
- English
- Resource Type
- Journal article