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RISS 인기검색어
- 검색키워드
- 저자 : Yavuz Kaplan (검색결과 3 건)
- 무료
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Role of Reinforcement Materials on Mechanical and Tribological Properties of PTFE Composites
Yavuz Kaplan 한국고분자학회 2020 폴리머 Vol.44 No.4
The use of polytetrafluoroethylene (PTFE) in various industrial applications under extreme operating conditions makes it very important to determine the behavior of this material. The mechanical and wear properties of PTFE can be enhanced by adding filler materials. This study focused on both the mechanical and tribological properties of PTFE and its composites with a 25 wt% addition of carbon and glass fiber (GF). Glass transition temperature (Tg), hardness, tensile, and impact tests were carried out to determine the mechanical and physical properties of PTFE. In addition, abrasive wear tests were applied to obtain wear behavior. The tensile strength values of the pure and C/GF-filled PTFE were found as 28, 16.7, and 18.6MPa, respectively. Tensile tests clearly showed that the filler materials led to a reduction of the tensile strength and elongation at break of the PTFE. Impact energy values were similarly decreased by the addition of filler materials. However, the carbon and GF additions significantly increased the abrasive wear resistance and Tg of the PTFE. Consequently, carbon and GF-filled PTFE would be a suitable candidate for use in tribological applications.
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Ozan Kaplan,Nagehan Saltan,Arzu Köse,Yavuz Bülent Köse,Mustafa Çelebier 사단법인 한국질량분석학회 2023 Mass spectrometry letters Vol.14 No.2
Carthamus tinctorius L. (known as safflower) is a valuable oil plant whose importance is increasing rapidly in the world due to its high adaptation to arid regions. The seeds of this unique plant are especially used in edible oil, soap, paint, varnish and lacquer production. Its flowers are used in vegetable dye production and medicinal purposes beside its features as a coloring and flavoring in food. After the oil is removed, the remaining pulp and plant parts are used as animal feed, and dry straw residues are used as fuel. Beside all these features, its usage as a herbal medicinal plants for various diseases has gained importance on recent years. In this study, it was designed a plant metabolomic approach which transfers all the recent data processing strategies of untargeted metabolomics in clinical applications to the present study. Q-TOF LC/MS-based analysis of the extracts (70% ethanol, hexane, and chloroform) for both seed and flowers was performed using a C18 column (Agilent Zorbax 1.8 µM, 100 × 2.1 mm). Differences were observed in seed and fruit extracts and these differences were visualized using principal component analysis (PCA) plots. The total number and intersections of the peaks in the extracts were visualized using peak count comparison graph. Based on the experimental results, the number of the detected peaks for seeds was higher than the ones for the flowers for all solvent systems to extract the samples.
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Wear Characterization of Reinforced Polyurethane Composites Produced via Vacuum Casting
Sait Kocak,Yavuz Kaplan 한국고분자학회 2021 폴리머 Vol.45 No.6
In recent years, research relating to polyurethane has been growing because of the lightness, low cost, and favorable mechanical properties of this material. The increased usage areas of polyurethane in tribological systems make it very important to determine its wear behavior. This study focuses on the wear characterization of polyurethane composites reinforced with glass fiber, SiC, and Al₂O₃. The wear tests were carried out using a pin-on-disc test apparatus against an abrasive counter-face at different applied loads (5 and 10 N). Scanning electron microscopy was used to observe the damage on the worn surfaces. The wear experiments clearly demonstrated that the reinforcement materials significantly affected the tribological properties of the polyurethane composites. In addition, it was observed that particle reinforcement was more effective than fiber reinforcement under experimental conditions. Consequently, polyurethane with glass fiber, SiC, and Al₂O₃ fillers would be a suitable candidate for use in tribological applications.
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