SahaKocaefeKrauseEtAl2013

Référence

Saha, S., Kocaefe, D., Krause, C., Boluk, Y. and Pichette, A. (2013) Enhancing exterior durability of heat-treated jack pine by photo-stabilization by acrylic polyurethane coating using bark extract. Part 2: Wetting characteristics and fluorescence microscopy analysis. Progress in Organic Coatings, 76(2-3):504-512. (URL )

Résumé

Heat-treated wood is value added product which attracted the attention of consumers due its dark brown color which is of interest for decorative purposes. But this dark brown color fades when subjected to outdoor environment turning to grayish white color along with formation of small cracks and checks on the surface. In order to prevent the color change, an effort has been put forward for developing new coatings. The acrylic polyurethane coating with bark extract with or without lignin stabilizer proved to be very effective in protecting the surface of heat-treated jack pine. In this study, the interaction of these coatings with heat-treated jack pine surface was investigated and the results were compared with those of industrially available Laurentide coating. The capillary penetration was found to be the most important phenomenon in wood-coating interaction. The results revealed that capillary penetration rate was highly dependent on different additives used as well as surface tension and viscosity of the coatings. Two different models were used to evaluate volume change of the coating drop with time which is the indication of capillary action during wetting on heat-treated jack pine. Influence of mechanical surface treatment also plays an important role in wetting phenomenon of wood coating irrespective of wood grain direction. Water penetration through coatings is very important for wood discoloration during aging. Therefore, measurement of contact angle between water and coated/heat-treated wood system gave insight to water penetration at different aging times. Furthermore, the degradation at wood-coating interface was studied using a fluorescence microscope which did not reveal any degradation at the interface for coating containing bark extract and coating containing bark extract together with lignin stabilizer. The results of this study give an insight into high performance of acrylic polyurethane containing bark extracts alone or together with lignin stabilizer against color change of heat-treated jack pine. © 2012 Elsevier B.V.

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@ARTICLE { SahaKocaefeKrauseEtAl2013,
    AUTHOR = { Saha, S. and Kocaefe, D. and Krause, C. and Boluk, Y. and Pichette, A. },
    TITLE = { Enhancing exterior durability of heat-treated jack pine by photo-stabilization by acrylic polyurethane coating using bark extract. Part 2: Wetting characteristics and fluorescence microscopy analysis },
    JOURNAL = { Progress in Organic Coatings },
    YEAR = { 2013 },
    VOLUME = { 76 },
    PAGES = { 504-512 },
    NUMBER = { 2-3 },
    ABSTRACT = { Heat-treated wood is value added product which attracted the attention of consumers due its dark brown color which is of interest for decorative purposes. But this dark brown color fades when subjected to outdoor environment turning to grayish white color along with formation of small cracks and checks on the surface. In order to prevent the color change, an effort has been put forward for developing new coatings. The acrylic polyurethane coating with bark extract with or without lignin stabilizer proved to be very effective in protecting the surface of heat-treated jack pine. In this study, the interaction of these coatings with heat-treated jack pine surface was investigated and the results were compared with those of industrially available Laurentide coating. The capillary penetration was found to be the most important phenomenon in wood-coating interaction. The results revealed that capillary penetration rate was highly dependent on different additives used as well as surface tension and viscosity of the coatings. Two different models were used to evaluate volume change of the coating drop with time which is the indication of capillary action during wetting on heat-treated jack pine. Influence of mechanical surface treatment also plays an important role in wetting phenomenon of wood coating irrespective of wood grain direction. Water penetration through coatings is very important for wood discoloration during aging. Therefore, measurement of contact angle between water and coated/heat-treated wood system gave insight to water penetration at different aging times. Furthermore, the degradation at wood-coating interface was studied using a fluorescence microscope which did not reveal any degradation at the interface for coating containing bark extract and coating containing bark extract together with lignin stabilizer. The results of this study give an insight into high performance of acrylic polyurethane containing bark extracts alone or together with lignin stabilizer against color change of heat-treated jack pine. © 2012 Elsevier B.V. },
    ISSN = { 03009440 (ISSN) },
    KEYWORDS = { Acrylic polyurethane coating, Bark extracts, Contact angle, Degradation, Fluorescence microscope, Heat-treated jack pine },
    OWNER = { Luc },
    TIMESTAMP = { 2013.01.16 },
    URL = { http://www.sciencedirect.com/science/article/pii/S0300944012003098 },
}

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