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Ayrilmis, Nadir,Kwon, Jin-Heon,Lee, Seung-Hwan,Han, Tae-Hyung,Park, Chan-Woo Informa UK (TaylorFrancis) 2016 Journal of adhesion science and technology Vol.30 No.18
<P>The relationship between urea-formaldehyde (UF) adhesives (E0 and E1 classes) and microfibrillated-cellulose (MFC) and its effect on the mechanical properties of laminated veneer lumbers (LVLs) were investigated. Bending strength, modulus of elasticity in bending, and tensile shear strength of the LVLs were determined. The morphology, gel time, viscosity, and acidity of the modified UF adhesives were also investigated. The tensile shear strength of the LVLs significantly increased (2.89 to 3.35 N/mm(2)) as the MFC suspension was increased to 3.75 g in the 7.50 g E0 class UF adhesive, while it slightly increased (3.10 to 3.16 N/mm(2)) as the MFC suspension was increased to 2.5 g in the 8.75 g E1 class UF adhesive. The results showed that the bond performance of the E0 class adhesive with the MFC was better than that of the E1 class adhesive with the MFC. The MFC was found to be valuable nanoscale reinforcing filler for the improvement of bond performance of UF adhesive, in particular, E0 class adhesive, in the production of wood-based composites.</P>
Nadir Ayrilmis,Alperen Kaymakci,Ferhat Ozdemir 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.3
Injection molded specimens were prepared from the walnut shell flour and polypropylene with and without maleic anhydride-grafted polypropylene at 40, 50, and 60% (weight) contents of the walnut shell. The bending and tensile modulus of the composites significantly increased with increasing the filler content while the bending and tensile strengths significantly decreased. Water absorption and thickness swelling of the composites increased with increasing filler content. The MAPP improved the interfacial adhesion between walnut shell flour and polymer matrix. A 40/57/3 formulation of the walnut shell flour/polypropylene/MAPP can be used in outdoor applications requiring a high dimensional stability.
Kwon, Jin Heon,Park, Sang Bum,Ayrilmis, Nadir,Kim, Nam Hun,Kwon, Sung Min SAGE Publications 2013 Journal of composite materials Vol.47 No.16
<P>The effect of carbonization temperature on the electromagnetic interference shielding effectiveness, electrical resistivity, and mechanical performance of medium density fiberboards carbonized in a vacuum furnace under a gas flow of nitrogen (200 mL/min) between 400 and 1500 was investigated. The medium density fiberboards specimens carbonized below 700 showed stable and low electromagnetic interference values (1.3–7.6 dB) between 10 MHz and 1 GHz frequency. The electromagnetic interference (average 43.1 dB) of the MDF specimens carbonized at 800 were suitable for industrial applications. However, the MDF specimens carbonized above 900–1500 showed high electromagnetic interference values (66.8<B>–</B>84.6 dB). When the carbonization temperature increased from 600 to 700, the electrical resistivity of the specimens greatly decreased (180.9 × 10<SUP>3</SUP> to 137.5 Ω-cm). A further increment in the carbonization temperature (1200) had a small effect on the electrical resistivity (5.8 Ω-cm) of the specimens and no effect between 1300 (0.5 Ω-cm) and 1500 (0.5 Ω-cm). The carbonized specimens showed lower modulus of rupture and internal bond strength values than the untreated specimens but the differences between the strength values of the untreated specimens and the carbonized specimens decreased with increasing carbonization temperature. The modulus of elasticities of the specimens carbonized above 800 were higher than the untreated specimens.</P>