The Effect of Hydroxyl Radical Generation on Free-Radical Activation of TMP Fibers |
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Authors: | Yuhui Qian Barry Goodell Jody Jellison Christopher C. Felix |
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Affiliation: | (1) Wood Science and Technology, University of Maine, 5755 Nutting Hall, Orono, ME 04469, USA;(2) Wood Science and Technology, University of Maine, 5755 Nutting Hall, Orono, ME 04469, USA;(3) Molecular Plant Pathology, University of Maine, 160 Hitchner Hall, Orono, ME 04469, USA;(4) Biophysics Research Institute, Medical College of Wisconsin, Milwaukee, WI 53226, USA |
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Abstract: | The purpose of this work was to study the mechanisms involved in free radical activation of thermal mechanical pulp (TMP) fibers with the ultimate goal of developing methods for bonding wood fiber without the use of traditional adhesives. The generation of hydroxyl radicals in a mediated Fenton system was studied using electron spin resonance (ESR) spin-trapping techniques and indirectly through chemiluminescence measurement. The activation of TMP fibers was also evaluated by ESR measurement of free phenoxy radical generation on solid fibers. The results indicate that low molecular weight chelators can improve Fenton reactions, thus in turn stimulating the free radical activation of TMP fibers. However, it was also shown that excessive and prolonged free radical treatment may cause the destruction of fiber phenoxy radicals. In conclusion, this study demonstrates the potential for application, but also the complexity of free radical chemistry in biological materials, especially with regard to the chelation of transition metals and the interaction between free radicals. |
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Keywords: | Hydroxyl radical phenoxy radical TMP fibers Electron Spin Resonance |
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