Enhancement of performance characteristics of epoxy adhesives through particle reinforcement

Yetgin, Hasan
Epoxy adhesives are common bonding agents used to join dissimilar materials. They are widely preferred in aerospace industry. But, their lack of performance at extremities of service temperatures limits their use in practical applications. The aim of this study is to improve the epoxy adhesives’ thermal properties through addition of filler particles, i.e. boron nitride, aluminum oxide, titanium oxide and Au doped titanium oxide. The last one has been developed specifically for this study to enhance the drawbacks of titanium particles in thermal conductivity. In order to have regular samples, a sample preparation method has been suggested. Then, the samples were tested by Dynamic Mechanical Analysis (DMA), Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy (SEM), Thermal Conductivity Measurement, Fourier Transform Infrared Spectroscopy (FTIR) and Single Lap Shear Test. The results showed that adding filler materials had favorable influence on thermal and mechanical performance. For the key parameters of thermal and mechanical performance of adhesives, boron nitride particles had greatest influence on the thermal conductivity. Moreover, Au doped and regular titanium dioxide particles had brilliant results in glass transition temperature. Adhesion strength was enhanced mostly by aluminum dioxide particles. The result of scanning methods validated the suggested sample preparation method. Finally, while Au doped titanium oxide particles enhanced the glass transition temperature, the expected improvement on thermal conductivity value has not been reached


Enhancing thermal conductivity of epoxy with a binary filler system of h-BN platelets and Al2O3 nanoparticles
Yetgin, Hasan; Veziroglu, Salih; Aktas, Oral Cenk; Yalçınkaya, Tuncay (Elsevier BV, 2020-04-01)
Epoxy resin is a common adhesive bonding material used to join dissimilar materials, especially in the electronics and aerospace industries. However, its low thermal conductivity and high coefficient of thermal expansion limit the direct use of epoxy in practical applications. In order to improve thermo-mechanical properties, we have prepared a series of epoxy composites using a binary system of hexagonal-boron nitride (h-BN) and aluminum oxide (Al2O3) fillers and analyzed the effect of the ratio of these f...
Modification of water vapour transfer rate of low density polyethylene films for food packaging
Dirim, Safiye Nur; Özden, Özlem; Bayındırlı, Alev; Esin, Ali (Elsevier BV, 2004-06-01)
One of the most common materials used for packaging is low density polyethylene film. To improve the water vapour transfer of the film, zeolite-polymer composite films and perforated films are produced. The solid-low density polyethylene composite films were prepared by extrusion of polyethylene beads coated with hot zeolite particles of a definite size range in an industrial extruder (-420/+212 -212/+106 -106/+53 muparticles/g of polyethylene beads). A needle (0.2, 0.5 and 1.75 mm in diameter) attached to ...
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Babuçcuoğlu, Yurdaer; Tinçer, Teoman; Özdemir, Tonguç; Department of Polymer Science and Technology (2015)
As polymers/fillers have shown much improved mechanical and thermal properties, the subject of epoxy resin reinforcement using boron minerals fillers has become valuable subject to study. The aim of this study is how boron minerals influence epoxy resins’ mechanical and thermal properties under gamma irradiation. The effects of boron on the mechanical and thermal properties of epoxy were studied in terms of mineral type, mineral loading concentration and irradiation dose in air and under vacuum. Bisphenol-A...
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Titanium and its alloys are commonly preferred implant materials for hard tissue applications. Today more than 4.4 million people have an internal fixation device and over 1.3 million people possess an artificial joint. Not only is there high demand for orthopedic surgeries for new patients every year, but there is also an even higher demand for patients who must receive revision surgeries. In order to enhance the properties of titanium based implant materials, different pretreatment and coating techniques ...
Preparation of epoxy-based composites containing barium metaborate and their characterization
Yürekli, Elif; Bayram, Göknur; Department of Chemical Engineering (2014)
Epoxy resin is one of the most important thermosetting polymers, widely used in various fields of industry. However, like most of the polymeric materials, epoxy resins are flammable and this restricts their application areas. The purpose of this thesis is to increase flame retardant property of epoxy-based composites using various flame retardant additives mainly including barium metaborate. This thesis consists of three main parts. In the first part, preliminary composites, which containing barium metabora...
Citation Formats
H. Yetgin, “Enhancement of performance characteristics of epoxy adhesives through particle reinforcement,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Aerospace Engineering., Middle East Technical University, 2019.