Mantar enfeksiyonunun ısıl işlem görmüş odun/pp kompozitlerin fiziko-mekanik direncine etkisi

Öz

Mantar çürümesinin ısıl işlem görmüş odun unu-plastik kompozitlerin fiziko-mekanik özellikleri üzerindeki etkisi belirlendi. İlk olarak, odun talaşları (Fagus orientalis L.) buharlı bir kazanda doymuş buhar altında çeşitli sıcaklıklarda (120, 150 ve 180 °C) 30 ve 120 dakika termal işleme tabi tutulmuş ve Wiley değirmen makinesinde öğütülmüştür. Daha sonra polipropilen, ısıl işlem görmüş odun unu ve uyumlaştırıcı olarak MAPP eriyik birleştirme ve enjeksiyon kalıplama işlemi kullanılmıştır. Bazı fiziksel ve mekanik parametreler mantar (Trametes versicolor) enfeksiyonundan önce ve sonra 6 hafta boyunca ölçülmüştür. 180°C'de 120 dakika ve 150°C'de 30 dakika boyunca bozulmamış ve çürümüş WPC'lerin eğilme direnci, elastikiyet modülü ve darbe direnci sırasıyla arttı, ancak WPC'lerin su alma ve kalınlığına şişmesi 180°C'de 120 dakika boyunca azaldı. 180 °C'de 120 dakika muamele edilen WPC'lerin ahşap parçacıkları en az kütle kaybına sahipti. Mekanik özellikler, mantar enfeksiyonundan sonra azaldı. Ayrıca sonuçlar, çürümemiş numunelerin tüm formülasyonları için su alma ve kalınlığına şişmesinin beyaz çürüklük numunelerden önemli ölçüde daha düşük olduğunu göstermiştir.

Anahtar Kelimeler

• Mantar çürümesi
• ısıl işlem görmüş ahşap
• fiziksel ve mekanik özellikler
• çürüme direnci
• OPK’lar

Effect of fungal infection on physico-mechanical resistance of WPC made from thermally treated wood/PP

Öz

The effect of fungal decay on the physico-mechanical characteristics of thermally treated wood flour-plastic composites was determined. Firstly, the wood chips (Fagus orientalis L.) were treated thermally for 30 and 120 minutes at various temperatures (120, 150, and 180 °C) under saturated vapour in a steaming vessel and they were ground by Wiley mill machine. Then, polypropylene, thermally treated wood flour, and MAPP as compatibilizer were used by melt compounding and injection molding process. Some physical and mechanical parameters were measured prior to and after fungal (Trametes versicolor) infection for 6 weeks. The flexural strength, flexural modulus, and impact strength of undecayed and decayed WPCs at 180 °C for 120 min and at 150 °C for 30 min increased, respectively, but the water uptake and thickness swelling of WPCs decreased at 180 °C for 120 min. The wood particles of WPCs treated at 180 °C for 120 minutes had the least mass loss. The mechanical property parameters were reduced after fungal infection. Moreover, the results showed that the moisture sorption and thickness swelling for all formulations of unrotted specimens were significantly lower than that of white-rotted specimens.

Anahtar Kelimeler

• Fungal decay
• thermally treated wood
• physical and mechanical properties
• decay resistance
• WPCs

Kaynakça

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