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Effects of wollastonite nanofibers on fluid flow in medium-density fiberboard

Journal of Forestry research 2016年第1期27卷 209-217页

作者： hamid r.taghiyari Younes Sarvari Samadi Wood Science and Technology Department Faculty of Civil Engineering Shahid Rajaee Teacher Training University Faculty of Wood Technology and Construction Rosenheim University of Applied Sciences

We studied the effect of wollastonite nanofibers on fluid flow in medium-density fiberboard （MDF）. Nanowollastonite （NW） was applied in MDF at 10 %, based on the dry weight of wood fibers. We also tested chicken feathers as an additive to the matrix at 5 and 10 % by weight. The weight of feathers was reduced from the wood fibers to keep the density of the panels constant （0.66 g cm-3）. Wollastonite nanofibers acted as filler in the matrix and significantly decreased gas and liquid perme- ability. Higher thermal conductivity of the N-W-treated MDF-mats resulted in a better cure of resin, and conse- quently more integrity in the composite-matrix and lower permeability. The water-repellant property of wollastonite also contributed to the decrease in liquid permeability. Feathers reduced gas and liquid permeability due to the hydrophobic nature of keratin, as well as its formation as a physical barrier towards passing of fluids. Ten percent feather content proved too high and some checks and cracks occurred in the core of the panels after hot-pressing. Panels with 5 %-feather content resulted in both lower fluid flow and adequate physical integrity in the core sec- tion of the MDF-matrix.

关键词： Chicken feather Composite board Mineralmaterials Thermal conductivity coefficient Wollastonitenanofibers Wood fiber

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Effects of densification on untreated and nano-aluminum-oxide impregnated poplar wood

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Journal of Forestry research 2017年第2期28卷 403-410页

作者： hamid r.taghiyari Ghonche rassam Kazem Ahmadi-DavazdahEmam Wood Science&Technology Department The Faculty of Civil EngineeringShahid Rajaee Teacher Training UniversityTehranIran Zelam Ltd A Lonza CompanyNew PlymouthNew Zealand

Effects of densification of poplar wood（Populus nigra） impregnated with nano-aluminum oxide（NA） and pre-treated with water vapor for 4 and 6 h were investigated in the present study. Physical and mechanical properties of treated poplar wood were measured according to the ASTM D-143 standard specifications, and then compared with the untreated specimens. results showed significant improvement in all properties as a result of densification. A 4-h vapor pre-treatment improved effects on both physical and mechanical properties. When the duration of vapor-treatment increased to 6 h, wood polymers degraded to the extent that the improvements due to the vapor pre-treatment decreased substantially, though the final results were still significant improvements compared with the control specimens. High thermal conductivity coefficient of NA slightly but not significantly improved properties. Due to the high spring-back after 15 days,densified poplar is not recommended for applications in which densified wood will be exposed for long periods to high humidity or to direct water.

关键词： poplar untreated nigra degraded specifications exposed pretreatment modulus Heidelberg swelling

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Physical and Mechanical Properties of Eco-Friendly Composites Made from Wood Dust and recycled Polystyrene

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Journal of renewable Materials 2022年第1期10卷 75-88页

作者： Dafni Foti Eleni E.Voulgaridou Sotirios Karastergiou hamid r.taghiyari Antonios N.Papadopoulos Department of Forestry and Natural Environment International Hellenic UniversityDramaGreece Department of Forestry Wood Sciences and DesignUniversity of ThessalyKarditsaGreece Wood Science and Technology Department Faculty of Materials Engineering&New TechnologiesShahid Rajaee Teacher Training UniversityTehranIran

The development of alternative wood composites based on the use of waste or recycled materials can be beneficial due to over exploitation of natural *** this frame,an option for the successful utilization of waste polystyrene which avoids environmental problems that formaldehyde adhesives cause and also reduces waste dis-posal,is its potential application as a binder for the production of value-added environmentally friendly and low cost wood *** types of panel were successfully made,consisting of wood dust and two recycled poly-styrene contents,namely,15%and 30%.Both physical properties,water absorption and thickness swelling,and mechanical properties,modulus of rupture,shear strength parallel in the plane of the board and glue line shear strength,were significantly improved as the recycled polystyrene content increased from 15%to 30%.Water absorption and thickness swelling after 24 h immersion in water were improved by 165%and 750%as the recycled polystyrene content increased from 15%to 30%.The magnitude of the improvement in mechanical properties however,was less pronounced than of the physical properties since modulus of rupture,shear strength parallel in the plane of the board and glue line shear strength were increased by 43.6%,50%and 61.5%,*** low viscosity of the recycled polystyrene caused more mobility inside the panel matrix and therefore,an improved penetration took place into adequate depth of the compressed dust *** is concluded that boards can be successfully produced using these waste raw materials,wood dust and recycled polystyrene in organic solvent as a binder,and therefore it can reduce waste disposal and provide cleaner production for the development of wood-based boards.

关键词： Cold pressing composites recycled polystyrene wood dust

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Organo-silane compounds in medium density fiberboard:physical and mechanical properties

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Journal of Forestry research 2015年第2期26卷 495-500页

作者： hamid reza taghiyari Ali Karimi Paridah Md.Tahir Wood Science & Technology Department Faculty of Civil EngineeringShahid Rajaee Teacher Training University Department of Wood and Paper Science & Technology Faculty of Natural ResourcesThe University of Tehran Laboratory of Biocomposite Technology Institute of Tropical Forestry & Forest Products (INTROP)University Putra Malaysia (UPM)

We studied the effects of nanoparticles of organo-silane（NOS） compounds in the size range of20–80 nm on physical and mechanical properties in medium density fiberboard,and used NOS at four consumption levels of 0,50,100,and 150 g kg-1dry wood *** of all treatments was kept constant at 0.67 g *** water-repellent property of organo-silane significantly reduced water absorption（WA） and thickness swelling but mechanical properties declined due to the reduced proportion of wood-fiber as organo-silane was added to the matrix：the compression ratio of MDF panels and the integrity among wood-fibers both declined,resulting in reduced mechanical *** recommend use of 50 g of NOS/kg wood-fiber to improve WA and thickness swelling while retaining acceptable mechanical properties.

关键词： Composite-board Medium-density fiberboard(MDF) Nanotechnology Physical and mechanical properties Water-repellant Organo-silane

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