Composite wood products
Behzad Kord; Mehdi Roohani
Abstract
In this study, the synergic effects of cellulose nanocrystal and nanoclay on the biodegradation and migration behavior of composite films based on polylactic acid (PLA) were investigated. PLA and PLA-based nanocomposite films containing different loads of cellulose nanocrystal ...
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In this study, the synergic effects of cellulose nanocrystal and nanoclay on the biodegradation and migration behavior of composite films based on polylactic acid (PLA) were investigated. PLA and PLA-based nanocomposite films containing different loads of cellulose nanocrystal and nanoclay (0, 3 and 5 wt % each) were fabricated using a solvent casting method. In order to improve the compatibility and miscibility of the whole system with respect to PLA matrix, cellulose nanocrystal was treated with oleic acid. For evaluating the biodegradation and migration behavior of films, the enzymatic degradation, biodegradation, buried in soil and compost; and overall migration were tested. The results indicated that the biodegradability of the composites increased with the increase of nanoparticles in the enzymatic, soil and compost media. Besides, with the addition of cellulose nanocrystal and nanoclay to the polymer matrix, the overall migration of composites decreased. This could be due to a better adhesion of the nanoparticles to the polymer matrix, and the tortuousity of their path.
Composite wood products
Saeid Ismaeilimoghadam; Mohammad Shamsian; Ali Bayat Kashkoli; Behzad Kord
Abstract
This research with aim of evaluation the effect of chemical treatment of wood flour on physical, mechanical and morphological properties of polypropylene-nano SiO2 hybrid nanocomposite were done. For this purpose, wood flour with sodium hydroxide and benzyl chloride to chemically treatment. For ensure ...
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This research with aim of evaluation the effect of chemical treatment of wood flour on physical, mechanical and morphological properties of polypropylene-nano SiO2 hybrid nanocomposite were done. For this purpose, wood flour with sodium hydroxide and benzyl chloride to chemically treatment. For ensure the chemical treatment, Fourier transform infrared (FTIR) spectroscopy tests was done on the treated and untreated wood flour. Wood flour at 60% weight ratio with polypropylene with 4% maleic anhydrate grafted polypropylene coupling agent in extrusion were mixed. Also Nano SiO2 with 0, 1, 3 and 5% as filler was used. The sample specimen were manufactured by using injection molding techniques. Then mechanical tests such as bending resistance and modulus and physical tests such as water absorption and thickness swelling according to the ASTM standard was done on the samples. Also for morphological investigation on the Nano composites from Scanning Electron Microscopy (SEM) was used. Results showed that the bending resistance and modulus increased with effect of chemical treatment but water absorption and thickness swelling decreased. With increase of Nano SiO2 to 3% the mechanical properties increased but adding further amount Nano particles reduced the mechanical properties. With increase of SiO2 Nano particles to 5% the water absorption in Nano composites were increased, but thickness swelling was decrease. The results of SEM showed an improvement in interface between filler and matrix with effect of chemical treatment Also transmittance of Nano SiO2 to 3% levels was good.
Composite wood products
Behzad Kord
Abstract
In this study, the effect of nanoclay particles content on mechanical properties of wood polymer composite made of high density polyethylene and wood flour were investigated. For this aim, wood flour were compund with high density polyethylene at 50% by weight, and nanoclay with 0, 1, 3 and 5% ...
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In this study, the effect of nanoclay particles content on mechanical properties of wood polymer composite made of high density polyethylene and wood flour were investigated. For this aim, wood flour were compund with high density polyethylene at 50% by weight, and nanoclay with 0, 1, 3 and 5% were used, also 2% of MAHDPE was also used as the coupling agent in all formulatins. Then wood polymer nanocomposite were manufactured in injection molding. Mechanical tests such as tensile, bending and notched impact were performed on samples. Results indicated flextural modulus, flextural strength, tensile modulus tensile strength and were increased by increasing of nanoclay particles content, however, notched impact strength was reduced. Also, studies on structural behavior of wood polymer nanocomposite with x-ray showed that nanoclay distributed as intercalation structure in polymer matrix, and the d-spacing of layers were increased with increasing of nanoclay particles content
Pulp and paper
Behzad Kord
Abstract
This study is for identifying of the effect of refining intensity on pulp and paper properties made from eucalyptuswood. For this purpose three normal eucalyptus camaldulensis spp trees were randomly cut down from Shastkolateh Experimental Forest located in Gorgan. From each tree, one disk ...
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This study is for identifying of the effect of refining intensity on pulp and paper properties made from eucalyptuswood. For this purpose three normal eucalyptus camaldulensis spp trees were randomly cut down from Shastkolateh Experimental Forest located in Gorgan. From each tree, one disk with 50cm thickness from breast height were selected for pulp making. Then disks converted to chips by chipper, and the chips were cooked by kraft process, the cooking conditions were as following effective alkali 20%, sulfidity 25%, tempreture 190 0C and Time 90min. After cooking and pulping process, the pulp refined with PFI Mill in 5 different intensity with 0 rpm, 500 rpm, 1500 rpm, 2500 rpm and 3500 revelutions. Then, papermaking and measuring the paper properties such as freeness, tensile strength, tear strength, burst strength and density were done. Then data were statisticaly analysed. The results indicated that, there are significant difference between pulp and paper properties made of eucalyptus camaldulensis spp wood with 5 different refining intensity in 95% confident level. As increasing of refining intensity and refining revolutions, freeness and tear strength of paper decreased but tensile strength, burst strength and density of paper incrased. However, the highest value of freeness and tear strength of paper related to refining intensity with 0rpm revelution (without refining) and highest value of tensile strength, burst strength and density of paper related to refining intensity with 3500rpm revelution
