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Article Citation - WoS: 9Citation - Scopus: 8Reinforcing Effect of Polyurethane Sizing on Properties of Acrylonitrile-Butadiene Composites Involving Short Carbon Fiber(Springer international Publishing Ag, 2020) Ahmed, Shan Abdulalaziz; Tirkes, Seha; Tayfun, UmitIn this study, we present the influence of sizing layer of short carbon fiber (CF) to the basic properties of CF reinforced acrylonitrile-butadiene-styrene (ABS) composites. Composite samples are prepared with four different loading ratio of 5, 10, 15 and 20% by weight using melt-compounding. Surface topography, elemental analysis and surface functionality of CF samples are confirmed by atomic force microscopy (AFM), energy-dispersive X-ray (EDX) and infrared (FTIR) spectroscopy techniques, respectively. Characterizations of composites are performed based on mechanical, thermo-mechanical, melt-flow (MFI) and morphological performances of composites. According to test results, mechanical properties of ABS are enhanced with CF additions. Polyurethane (PU) sized CF containing composites display higher tensile strength, modulus and hardness compared to desized ones. CF additions lead to increase in glass transition temperature of ABS copolymer. MFI values of composites are found to be in narrow range, hence CF additions cause no effect for processing conditions of ABS. According to SEM analysis, CF surfaces are covered by polymer matrix thanks to PU sizing layer of CF, whereas debondings are formed for desized CF-filled ABS matrix. Results indicate that PU-sizing is suitable for ABS/CF composite system. [GRAPHICS] .Article Citation - WoS: 31Citation - Scopus: 34Mechanical, Thermo-Mechanical and Morphological Characterization of Abs Based Composites Loaded With Perlite Mineral(Iop Publishing Ltd, 2020) Alghadi, Aiah Mohamed; Tirkes, Seha; Tayfun, UmitAcrylonitrile-butadiene-styrene (ABS) copolymer was filled with perlite mineral (PER) at four different loading level of 2.5%, 5%, 10% and 15%. ABS/PER composites were produced using lab-scale micro-compounder followed by injection molding process. Mechanical, thermo-mechanical, melt-flow and morphological properties of composites were reported by tensile and impact tests, dynamic mechanical analysis (DMA), melt flow index (MFI) test and scanning electron microscopy (SEM), respectively. Mechanical characterizations revealed that tensile strength, elongation and Youngs? modulus of ABS were improved by PER inclusions. However, impact strength of ABS reduced with increase of PER concentration. Glass transition temperature of ABS displayed increasing trend for %5 concentration of PER. MFI test implied that PER addition caused slight decreasing for MFI value of unfilled ABS. Homogeneous dispersion of PER particles into ABS matrix for their lower loading level was obtained from SEM micrographs of composites. According to findings, 5% PER containing sample exhibited the best performance and it was remarked as the most suitable candidate among fabricated ABS based composites.Conference Object Citation - WoS: 33Citation - Scopus: 35Enhancement of Mechanical, Thermal and Water Uptake Performance of Tpu/Jute Fiber Green Composites Via Chemical Treatments on Fiber Surface(Walter de Gruyter Gmbh, 2020) Salem, Tuffaha Fathe; Tirkes, Seha; Akar, Alinda Oyku; Tayfun, UmitChopped jute fiber (JF) surfaces were modified using alkaline, silane and eco-grade epoxy resin. Surface characteristics of jute fibers were confirmed by FTIR and EDX analyses. JF filled polyurethane elastomer (TPU) composites were prepared via extrusion process. The effect of surface modifications of JF on mechanical, thermo-mechanical, melt-flow, water uptake and morphological properties of TPU-based eco-composites were investigated by tensile and hardness tests, dynamic mechanical analysis (DMA), melt flow index (MFI) test, water absorption measurements and scanning electron microscopy (SEM) techniques, respectively. Mechanical test results showed that silane and epoxy treated JF additions led to increase in tensile strength, modulus and hardness of TPU. Glass transition temperature (T-g) of TPU rose up to higher values after JF inclusions regardless of treatment type. Si-JF filled TPU exhibited the lowest water absorption among composites. Surface treated JFs displayed homogeneous dispersion into TPU and their surface were covered by TPU according to SEM micro-photographs.Article Citation - WoS: 15Citation - Scopus: 17Development of Barite-Filled Acrylonitrile Butadiene Styrene Composites: Mechanical, Thermal, Melt-Flow and Morphological Characterizations(Elsevier, 2021) Madkour, Salma Ali; Tirkes, Seha; Tayfun, UmitBarite mineral (BRT) was compounded with acrylonitrile butadiene styrene terpolymer (ABS) with four varied filling ratio of 5%, 10%, 15% and 20% by weight. ABS/BRT composites and unfilled ABS were fabricated by twin screw micro-extruder and test samples were shaped using injection molding process. Tensile tests, shore hardness measurements and impact tests, dynamic mechanical analysis (DMA), melt-flow index (MFI) study and scanning electron microscopy (SEM) characterization techniques were performed in order to investigate mechanical, thermo-mechanical, melt-flow and morphological performance of composites, respectively. Mechanical tests results showed that tensile strength and hardness of unfilled ABS were enhanced as BRT content increased. DMA study revealed that in addition to glass transition temperature, storage modulus of ABS raised by BRT inclusions. However, impact energy of ABS exhibited decreasing trend with the loading level of BRT. According to MFI measurements, BRT additions caused no significant change for MFI parameter of ABS regardless of concentration. It was confirmed by SEM microphotographs that the dispersion of BRT particles was found to be more homogeneous into ABS phase for their lower contents. The filling ratio of 10% BRT yield the highest performance among fabricated ABS based composites according to test results.
