Yazar "Mengeloglu, Fatih" seçeneğine göre listele

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    Ammonium zeolite and ammonium phosphate applied as fire retardants for microcrystalline cellulose filled thermoplastic composites
    (Elsevier Sci Ltd, 2019) Cavdar, Ayfer Donmez; Torun, Sevda Boran; Ertaş, Murat; Mengeloglu, Fatih
    In this study, mechanical, thermal, fire and morphological properties of thermoplastic composites filled with fire retardants (FRs) and microcrystalline cellulose (MCC) were investigated in detail. The composites were produced through the extrusion + injection molding methods using MCC, FRs and high density polyethylene (HDPE). Based on the composites dry-weights, 10%wt. of mono ammonium phosphate (MAP), ammonium zeolite (AZ) or natural zeolite (NZ) were incorporated into polymer matrix for improving reaction of fire of the composites, and their effects on technological properties were evaluated. MAP had a positive effect on tensile and flexural moduli of the composites whilst tensile strength, elongation at break and impact strength properties of the composites were decreased. The highest tensile and flexural strength values were obtained from HDPE/MCC/AZ samples, respectively, 22.13 MPa and 29.93 MPa. The minimum value for impact strength was obtained from HDPE/M/MAP5/AZ5 composite (1.68 kJ/m(2)) whereas the maximum value for impact strengths were achieved from control HDPE composite (5.15 kJ/m(2)) and HDPE/MAP10 (3.30 kJ/m(2)). Flexural strength and flexural modulus values of all HDPE composites were higher than the requirement by the ASTM D 6662 standard for polyolefin based plastic lumber decking boards. As the MCC content increased, the initial, maximum and final degradation temperatures of HDPE composites have not been influenced greatly. Thermogravimetric and differential scanning calorimetry analyses showed that the maximum rate weight loss temperature and the crystalline features of HDPE have not been significantly influenced by addition of MCC. Limiting Oxygen Index (LOI) level and charring increased when FRs were incorporated into polymer matrix. In addition, the burning rates of HDPE/MAP10 and HDPE/MCC/MAP5/AZ5 composite were slowed down by 64% and 62%, respectively. It was found that no burning in HDPE/MCC/MAP10 was observed composite during the horizontal burning test. Especially; HDPE/MCC/MAP samples can be used for building products because they meet the CC1 (plastic materials that have a burning extent of 25 mm or less where tested at a nominal thickness of 1.5 mm, or in the thickness intended for use, in accordance with ASTM D 635) class requirements of international building code which means a model building code improved by the International Code Council. In the light of obtained results, it was specified that use of FRs improved morphological, thermal and reaction of fire of the MCC filled HDPE composites.
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    Effect of Chemical Modification with Maleic, Propionic, and Succinic Anhydrides on Some Properties of Wood Flour Filled HDPE Composites
    (North Carolina State Univ Dept Wood & Paper Sci, 2014) Cavdar, Ayfer D.; Mengeloglu, Fatih; Karakus, Kadir; Dizman Tomak, Eylem
    One of the biggest disadvantages of wood, as a potential reinforcement for thermoplastics, is its hydrophilicity. The aim of this study was to evaluate the effect of chemical modification of wood flour on mechanical, thermal, and fire properties of filled high-density polyethylene composites. For this purpose, aspen flour was modified with maleic, propionic, and succinic anhydrides. The modified wood flour and high-density polyethylene were compounded into pellets by single-screw extrusion, and test samples were prepared by injection molding. Tensile and flexural tests, impact testing, limiting oxygen index, TGA, and SEM analyses were conducted both for modified and un-modified samples. Based on the test results, chemical modification enhanced the properties of thermoplastic composites. Depending on the chemical concentrations, the flexural, tensile, and impact strengths of the modified flour filled HDPE composites were improved slightly, while the tensile and flexural moduli of the samples were increased significantly. The limiting oxygen index (LOI) levels of samples with modified wood flour were slightly improved, and succinic anhydride provided higher LOI levels compared to the samples with other anhydrides. This showed that the composites filled with chemically modified wood flour were slightly more thermally stable than control samples. It appears that wood flour modified with maleic, propionic, and succinic anhydrides can be successfully utilized as filler in polymer matrices.
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    Effects of alkyl-ketene dimer on physical, mechanical and formaldehyde emission properties of particleboard produced with melamine-impregnated paper waste
    (Taylor & Francis Ltd, 2024) Basboga, Ibrahim Halil; Basboga, Hulya Varlibas; Tasdemir, Cagatay; Atar, Ilkay; Yuce, Ozcan; Karademir, Arif; Mengeloglu, Fatih
    This study aimed to enhance the physical properties and the weak heat transmission of the core layer, which are the weak points of particleboard produced using melamine-impregnated paper waste (MIPW) as an adhesive. Alkyl-ketene dimer (AKD) and paraffin were used as water-repellent chemicals. MIPW was used as an adhesive, and no additional resin was used. As a result of this study, the samples' physical properties improved with AKD and paraffin's existence. Moreover, it has been approved that AKD is more effective than paraffin in improving the physical properties of the particleboard because AKD improves ester bonding with hydroxyl groups of cellulose fibers. The usage of water repellents resulted in the improvement of internal bond (IB) properties. It was determined that the type and amount of water-repellent chemicals significantly affected the mechanical and physical properties and formaldehyde content of the produced particleboards, except for bending properties. Just the chemical type was found to be significantly effective on bending strength (BS) and modulus of elasticity (MOE) properties. Overall, the study findings suggested that AKD might be successfully utilized as a water-repellent chemical in particleboard manufacturing, while MIPWs used as an adhesive.
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    Hybrid thermoplastic composite reinforced natural fiber and inorganic filler
    (Walter De Gruyter Gmbh, 2023) Cavdar, Ayfer Donmez; Torun, Sevda Boran; Pesman, Emrah; Angin, Naile; Ertas, Murat; Mengeloglu, Fatih
    This chapter summarizes the recent studies on natural and synthetic short fiber-filled thermoplastic-based hybrid composites. This review will provide information on the manufacturing processes and the structure, and the properties of hybrid thermoplastic composites, in separate sections. It supplies data on physical, mechanical, morphological, rheological properties, and thermal and flammability characterizations of select hybrid composites. This chapter underlines the importance of hybrid thermoplastic composite in achieving predetermined material performances. Recent studies have proven that the hybridizations of natural fiber and inorganic filler might provide exceptional and promising features.
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    Long-Term Leaching Effect on Decay Resistance of Wood-Plastic Composites Treated with Boron Compounds
    (Springer/Plenum Publishers, 2018) Cavdar, Ayfer Donmez; Dizman Tomak, Eylem; Mengeloglu, Fatih
    In this study, water absorption, thickness swelling and decay resistance of thermoplastic composites treated with three types of boron compounds was investigated. Spruce wood flour was treated with boric acid (BA), borax (BX) and mixture of BA-BX, and then was reinforced at two loading rate (20 and 40 wt%) in polymer matrix. Decay test of the composites was performed using with a brown rot fungus Coniophora puteana and a white rot fungus Trametes versicolor both for leached and unleached samples. The morphologic evaluations of decayed samples were done by scanning electron microscopy. Composites containing higher wood flour loading resulted in increased water absorption, thickness swelling, weight loss and moisture content. Fungal decay susceptibility of WPCs was influenced by leaching test for 60 days. Boron compound treated composites showed higher weight loss and moisture content than controls in decay test. All tested performance parameters were considerably increased in BX containing composites.
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    Utilization of different size waste melamine impregnated paper as an adhesive in the manufacturing of particleboard
    (Elsevier Sci Ltd, 2023) Basboga, Ibrahim Halil; Tasdemir, Cagatay; Yuce, Ozcan; Mengeloglu, Fatih
    In this study, the efficiency of waste melamine impregnated paper (WMIP) as an adhesive; effects of WMIP usage with different sizes and amounts as a resin in three-layer particleboard manufacturing on mechanical, physical, surface roughness properties and formaldehyde emission values were investigated. Three-layer particleboards were manufactured with three different sizes (small, medium and large) and four different rates (10, 15, 20, 25% of total board weight) of WMIP. Mechanical (bending strength, modulus of elasticity, internal bond strength, surface soundness, screw withdrawal strength), physical (density, thickness swelling, water absorption, Brinell hardness, and surface roughness) properties and formaldehyde contents of the samples were determined ac-cording to relevant standards. As a result of the study, it was determined that WMIP still has some uncured adhesive with curing ability in it. The size and amount of WMIP had a statistically significant effect on the particleboard properties (Mechanical, Physical Formaldehyde emission and surface roughness). While the me-chanical and physical properties improved as the amount of WMIP increased, these values deteriorated as the size of the WMIP increased. The best mechanical and physical results were obtained by using small-size WMIP at the rate of 25% and all the panel groups produced with small-size WMIP (except 10% ratio) have achieved the mechanical values required in the standard. In all particleboard groups produced, only the one with 25% of the small-size WMIP used group was provided with the standard requirements for thickness swelling properties. For optimal performance (the least rough surface characteristics), the formulation of the panels should contain small WMIP sizes and a 20% WMIP ratio. The findings also showed that increasing the WMIP ratio has resulted in better mechanical properties. Through this study, some technological properties of three-layer particleboard produced with WMIPs were determined and potential utilization of WMIPs in particleboard manufacturing as an adhesive was demonstrated.