Resistance of modified polyvinyl chloride/wood flour composites to basidiomycetes

Aminosilane, melamine and acetic anhydride treated wood flour were added to polyvinyl chloride (PVC) and manufactured into wood-plastic composites (WPC) panels in order to investigate the influence of modification on the resistance to basidiomycetes of the composite. The composite consisted of 50 wt% wood and 50 wt% PVC dry blend. White rot (Trametes versicolor) and brown rot (Coniophora puteana) fungi were used to inoculate the composite. Test procedure was carried out according to ENV 12038 with an additional water pre-treatment of the composite. All tested formulations showed high resistance to basidiomycetes under the test conditions. With regard to the modifications used, only aminosilane treated composites showed slightly decreased weight loss values compared to the untreated reference.ZusammenfassungFür die Modifizierung der Holzkomponente wurden verschiedene Aminosilane, Melamin und Essigsäureanhydrid verwendet. Das behandelte Holzmehl wurde mit PVC zu WPC-Platten verarbeitet, um den Einfluss der Holzmodifizierung auf die Dauerhaftigkeit des Komposits zu untersuchen. Das Mischungsverhältnis von Holz zu PVC dry blend betrug 50/50 Gewichtsprozent. Weiß- und Braunfäulepilze (Trametes versicolor, Coniophora puteana) wurden mit dem Testmaterial beimpft. Die Resistenzprüfung wurde in Anlehnung an ENV 12038 durchgeführt, wobei eine zusätzliche Wasserlagerung der Komposite vor Versuchsbeginn implementiert wurde. Alle Formulierungen zeigten eine hohe Resistenz gegenüber Basidiomyceten. Im Vergleich zur unbehandelten Referenz wurden lediglich bei den Aminosilan behandelten Kompositen leicht verringerte Masseverluste gemessen.

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