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New grade of thermoplastic polyurethane with high thermal conductivity and low coefficient of friction

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Yüksek Lisans | 2017 | İzmir Katip Çelebi Üniversitesi Fen Bilimleri Enstitüsü

Today, thermoplastic polyurethane materials are widely used in many different applications. There are many types of thermoplastic polyurethanes which offers different mechanical and chemical properties according to application area. In addition to the existing properties, thermoplastic polyurethane materials mixed with various additives to obtain specific, targeted thermoplastic polyurethane materials in order to impart different properties to the material for application. In this study, materials of the sealing elements are approached which is one of the most important parts of the hydraulic & pneumatic systems widely used i . . .n industry. Nowadays when energy efficiency and product life become vital, it is quite important that prolongation of the sealing element life, increasing the energy efficiency and reducing maintenance requirements for hydraulic & pneumatic sealing elements sector. This study gains importance in terms of bringing the properties such as low coefficient of friction and high thermal conductivity coefficient in materials of hydraulic pneumatic sealing materials without breaking the standard physical and chemical properties of the material. Standard features expected from hydraulic & pneumatic sealing materials summarized as tensile strength, elongation at break, hardness, deformation under pressure (compression set) and wear resistance. In addition to these properties of standard materials, it envisaged that imparting low coefficient of friction to materials will reduce wearing because of friction and heat formation, imparting high thermal conductivity will facilitate transferring the heat generated from the material to the surrounding area. If these two properties are insufficient, burn spots and abrasions due to temperature increase observed in the working surfaces of the sealing elements. Herewith these problems cause leakage that is the indication of failure. By preventing these situations, the sealing elements will be able to benefit from the sector with higher energy efficiency and longer working life. Four different additive materials such as boron nitride, MoS2 ,graphite and PTFE were used at three different doses each to gain the specified properties to the thermoplastic material which is used in this study. The base material compounded with the additives was re-granulated with twin-screw extruder and after heat treatment of the materials, test plaques and sealing elements were produced with the help of plastic injection machines. xxvi FTIR, thermal conductivity coefficient, tensile, compression set, coefficient of friction and friction tests carried out to examine the properties expected to change. When all the results analyzed according to the tests performed, it has been observing that Sample 6 which has 5% PTFE acquired the targeted properties without deteriorating the existing properties. In this compounded material, the coefficient of thermal conductivity increases and the coefficient of friction decreases while the hardness, stress at 100% strain and compression set values are within acceptable limits Daha fazlası Daha az

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