Chemical emissions from adhesive-bonded wood products at elevated temperatures |
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Authors: | Yucheng Peng Sheldon Q Shi Leonard Ingram |
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Institution: | (1) Advanced Structures and Composites Center, University of Maine, Orono, ME, USA;(2) Forest Products Department, Forest and Wildlife Research Center, Mississippi State University, Mississippi State, MS 39762-9820, USA; |
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Abstract: | Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) was employed to examine the chemical emissions from the glued wood
samples at elevated temperatures (150, 200, 250, 300, 350, 400, 450, and 500°C). Two wood species, Douglas-fir (Pseudotsuga menziesii) and southern pine (Pinus palustris), one structural adhesive, phenol–resorcinol–formaldehyde (PRF), PRF-bonded Douglas-fir, and PRF-bonded southern pine were
evaluated. The volatile compounds with a mass range of 35–300 m/z emitted from the pyrolysis samples were separated by gas
chromatography (GC) and identified by mass spectrometry (MS). The results indicated that compared to neat wood and resin film
samples, several additional pyrolysis products were observed for the PRF-bonded wood samples including (1) acetaldehyde and
butanedial for PRF-bonded Douglas-fir and (2) acetaldehyde, furfural, 2-furanmethanol, butanedial, 2,3-butanedione, cyclopropyl
carbinol, 1,2-benzenediol, and 1-(acetyloxy)-2-propanone for PRF-bonded southern pine. These additional compounds were possibly
associated with the interaction between wood and PRF resin. The results also indicated that bonded wood products would be
less thermally stable than those of neat wood and PRF resin samples. |
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