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REPORT OF POLYMER AND COMPOSITE MATERIALS

April 27, 2019 0 Comment

REPORT OF POLYMER AND COMPOSITE MATERIALS (MM-305)

Study of Effect on Characteristics and Properties of Fabricated Micro-sized Alumina Particles and Epoxy Resin Composite
Doha Majeed (MM-15004), Sidra Abad (MM-15033), Hareem Zubairi (MM-15039), Abeer Jawad (MM-15043)
Department of Materials Science and Engineering, NEDUET, Pakistan
JULY’18

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Abstract:
The research and experiment are conducted with epoxy resin reinforced with alumina particles. Alumina particles chosen were micro sized, used in varying quantities. 0.5µm alumina particles were used in 10%, 20% and 30% quantities. In this paper, mechanical properties in the micro scaled structure including tests for tensile strength, impact strength are inspected. Thermal properties such as, thermal conductivity, thermal expansion is inspected. General properties such as density microstructure and glass transition temperature are also tested. Furthermore the changes in the properties by the addition of alumina in the varying quantities are also studied.

Introduction:
In recent years, there has been an evaluation in composites research sector. The uses of composites are rapidly increasing in various applications. (12) Composites, are simply a result of uniting mainly two different materials, one of them is called matrix while the other is called reinforcing material.(17)As composite is a heterogeneous solid consist of two or more kind of materials that are mechanically and metallurgically bonded together which is used as to rectify a weakness in one’s material by enhancing the strength of other. (9) By using composites, the engineers can improve the physical and mechanical properties of materials. (17)
In the study of ceramics versus composites, composite has numerous points of interest for example, they are light in weight, they may have induced hydrophobic characteristics and most importantly, they got prevalent mechanical properties. Be that as it may, composite items are additionally experiencing issues, for example low resistance and early failures. The utilization of Nano or Micro scale fillers is thought to be one of the techniques that can additionally enhance the properties of the composite.(6)The properties of the composite specimen might be alter on the basis of properties and volume fraction of the particular phase.(1)
Polymer based composites are one of their types which are highly useful due its high strength and low density.As epoxies are used widely in the industrial area now because of their excellent physical and chemical properties and moreover, they provide low density, thermal stability, heat resistance, adhesive strength, etc all by having highly cross-linked structure. (10)To modify its properties and to meet the required characteristics it is reinforced with metal, carbon or organic particles such as talc, silica particles, etc. The resultant composite comprises of the combined qualities of both polymer and particles. (2) As thermosetting plastics are often brittle so the filler material in added in to epoxy resins to modify their thermal, mechanical and electrical characteristics. (19)

This paper deals with such polymer composite using epoxy as mother matrix. Epoxy has different characteristics such as chemical attack, flame resistant, resistance to cold, radiation and steam, its curing ability at room temperature. With its presence in many polymers, epoxy resins are the primary choice because of their good chemical resistance, excellent mechanical properties and wide ranges of versatility in applications. Though there are so many advantages of epoxies, but the drawback of having low thermal conductivity is still a major issue. (18)
In this research, we have added alumina particles to the epoxy to enhance its properties and to gain the combine effects of both materials. Epoxy resin is commonly in used in insulating and electronic devices in power system applications. As the use of additives has been increasing, the use micro-sized particles as an additive in epoxy resin are a common application in industries too. (7) But the fundamental issue emerges in the manufacture of alumina is to get great scattering and interfacial quality between the epoxy resin and alumina particles. To overcome this drawback, processes like Salinization, functionalization of oxide-passivatedaluminum particles etc. might be done. (11)
In the experimental work, the tests included may require conductive material. As the conductive polymers are commonly used in our everyday applications like to prevent the dust attraction on TV cabinets and electrodes, etc. they are mostly related to the DC properties of an epoxy resin. Moreover, if we study the metal-polymer, the carbon-based filler materials might be used. (13) The pure resins or micro sized alumina particles fabricated with epoxies resins are also be used in partial discharge (PDs) of dielectric as a resistant but the nanocomposites dielectrics show more resistance and better properties. (3)
Light weighted conductive polymers are used in automobiles, dental services and electronic applications such as in Antistatic devices, Thermostats, conducting coatings, Electromagnetic Frequency Interference (EMI), etc (8). Moreover, Interpenetrating Phase Composites (IPC) coatings can also do by fabricating epoxy and alumina together. IPC coatings provide corrosion resistance, abrasion resistance, wear resistance, etc. (20)
As polymers are being used by in many applications of microelectronics, but because of a drawback i.e. having low thermal conductivity, it is became a secondary choice. So to overcome this flaw, the scientists came up with the different filler materials, For Example, carbon and metal fibers, ceramic particles, etc. But among all of these fillers, Alumina (Al2O3) is considered as a best candidate to improve the thermal conductivity and provide low CTE, non-toxicity and of course, low cost. (5) As Alumina is highly thermal-conductive but has low electrical conductivity just like silica, silicon carbide and Aluminum Nitride. (14)
So we chose alumina particles to moderate dielectric constant and low dielectric loss. Besides it also provides rigidity, toughness, good mechanical properties, lowers the coefficient of expansion; increases wear resistance and modified glass transition temperature.(15) Moreover, if we worked on the nanoparticles of Alumina, the coating by them will enhance the fracture toughness to an excellent level. (16)
In this experimental analysis, we run tests like Particle Size Analysis, Density Test, DSC, Thermal Conductivity Test, Thermal Expansion Test and TGA. Thermal characteristics are being tested by DSC (Differential Scanning Calorimeter) and TGA (Thermogravimetric Analysis). These tests are also shown the melting and crystallization characteristics, determine the purity and glass transition temperature also. (4)

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