5TH International Congress on Technology - Engineering & Science - Kuala Lumpur - Malaysia (2018-02-01)

Chemical Analysis And Mechanical Properties Of Epoxy Adhesives Of Graphene Reinforced Nylon-6.6 Nanomats

Although adhesion simply means bonding two or more particles or surfaces to each other, there has been a huge iceberg behind this definition. Because nobody exactly knows, where and when the history of adhesives began. Nevertheless, footprints that show it dates back to the history of human beings. That is why we set out our journey from ancient times [1]. Today adhesives are used in a wide range of applications. These applications range from simple sticky tapes to airplane fuselages and from envelopes to complex structures. Using adhesives instead of such conventional joining techniques as soldering, welding, nailing, riveting, and bolting gives a more uniform stress distribution, increase the designers’ freedom, production rates, and reduces the structures’ weight, machining operations and corrosion. These challenging advantages encourage engineers, academics, and industry to focus on adhesives and adhesively bonded composite joints (ABJs) more deeply [2]. Because expectation from adhesives is not only to stick two or more adherents to one another but also to make a uniform structure that, endure harsh environmental effects. Modern technological requirements from ABJs are long service life span (resistant to vibration, fatigue, and corrosion), lightweight (superior strength/stiffness to weight ratios), safety (crashworthy, strong damage tolerance and high-energy absorption capabilities), and various use of application (freedom of design and esthetic) [3]. Marques, da Silva [4] worked on adhesive and adhesive bonding operating below and above the glass transition temperature (Tg). They investigated properties of different types of adhesive shrinkage, expansion, and viscoelasticity at low and high temperature. In their study, it was concluded that shrinkage generally would not be a problematic issue for the failure of adhesive joints, compared to thermal expansion. For the multi-material structures having differential thermal expansion especially used in aerospace industry, selection of adhesive/adherend and joint geometry were the most critical factors to reduce or evade joint’s early failure. Palazzetti, Zucchelli [5] investigated the influence of electrospun nylon 6.6 nanofibrous mat on the fracture mechanics of virgin and nano-modified laminates subjected to Mode I and the Mode II loadings. In both tests (DCB and ENF), it was observed that composite delamination strength and damage tolerance were upgraded with the help of electrospun nylon 6.6 nanofibrous mat. In the first phase, Nylon 6.6 (PA 6.6) nanomats and PA 6.6 nanofibers containing 1, 3 and 5 wt. % graphene were produced by electro-spinning method. In the second phase, the mechanical properties of Single Lap Shear test coupons in accordance with ASTM D 5868-01 standard was checked respectively. The results obtained from the experiments were presented graphically and then these results were compared with each other to make a desired assessment. In addition, TGA / DTA chemical analyzes of reinforced epoxy adhesives were examined.
Mehmet Açık, Mürsel Ekrem, Ahmet Avcı