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2 2016

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Wood cement composites reinforced with polypropylene fibre

Donmez Cavdar A., Yel H., Boran S.

Journal of Achievements in Materials and Manufacturing Engineering

2016

Vol. 76, nr 2

49--54

Purpose: This paper presents basic investigation into the effect of different lengths of polypropylene fibres in surface layers of wood cement boards is investigated on their physical and mechanical properties including density, moisture content, thickness swelling, modulus of elasticity, modulus of rupture, internal bond strength and screw withdrawal strength of the samples. Design/methodology/approach: Wood cement composites with a dimension of 400x400x10 mm were produced using three different lengths of PPF and with a constant wood/ement ratio (1/3 by weight) and target density (1.2 g/cm3). Findings: The results showed that PPF usage had statistically significant effect on the properties of wood cement composite. The highest mechanical properties were obtained from samples of control-WCB group while the lowest moisture content and thickness swelling were observed in PPF reinforced cement boards. Research limitations/implications: It was observed that the PPF usage decreased thickness swelling values of the boards up to 80%, according to wood. Using wood and PPF together resulted in better mechanical values of the boards compared to using PPF alone and higher MOR and MOE values than the EN 634-2 standards. Physical properties of all the boards satisfied the minimum requirements for the EN 634-2 standard. Originality/value: The results can be assessed as novel in the range of usage a modified material in wood cement board.

Biological properties of nutshell and microcrystalline cellulose (MCC) filled high density polyethylene composites

Boran S., Dizman Tomak E., Dönmez Çavdar A.

Archives of Materials Science and Engineering

2016

Vol. 78, nr 2

71--77

Purpose: The composites based on natural fibre and wood can be destroyed by fungi attack, even the lignocellulosic materials were used as filler in hydrophobic thermoplastic matrix. The aim of this study was to investigate the effect of microcrystalline cellulose (MCC) and nutshell fibre content on decay resistance of natural fibre composites. Design/methodology/approach: Half of the composite samples were immersed in water for 60 days and then incubated by fungi to investigate the leaching effect on biological resistance. Furthermore, water absorption rate and thickness swelling of samples were determined during water immersing. For this purpose, total nine thermoplastic composites filled different MCC rate (5%, 10% and 15%) and nutshell content (30%) were produced. Decay test were conducted by using a white rot fungus–Trametes versicolor, and a brown rot fungus–Tyromyces palustris, according to EN 113 standard. Findings: Based on findings from this study, weight loss, water absorption rate and thickness swelling correlated with lignocellulosic content in composites. Samples exhibited less than 1% weight loss in decay test and excellent biological resistance against testing fungi. Research limitations/implications: Weight loss (%) and moisture content (%) values of MCC-nutshell HDPE composites after Tyromyces palustris and Trametes versicolor attack were found under 3% and 20%, respectively. Low weight loss values obtained in the study are supposed to be related with the low moisture content. Originality/value: There is not a study dealing with the decay resistance of WPCs produced by a combination of nutshell and MCC fibres. In addition, there is not a substantial study on the effects of MCC/plastic ratio for decay performance of WPCs contained nutshell after long-term leaching test.