Effect of Silane-Treated Rice Husk Derived Biosilica on Visco-Elastic, Thermal Conductivity and Hydrophobicity Behavior
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ORIGINAL PAPER
Effect of Silane-Treated Rice Husk Derived Biosilica on Visco-Elastic, Thermal Conductivity and Hydrophobicity Behavior of Epoxy Biocomposite Coating for Air-Duct Application M. Karthigairajan 1 & P. K. Nagarajan 2 & R. Raviraja Malarvannan 3 & B. R. Ramesh Bapu 4 & D. Jayabalakrishnan 5 & T. Maridurai 6 & V. K. Shanmuganathan 7 Received: 9 August 2020 / Accepted: 8 October 2020 # Springer Nature B.V. 2020
Abstract High performance epoxy biocomposite coating material was prepared using agricultural waste (rice husk) derived biosilica and characterized for visco-elastic, thermal conductivity and hydrophobic behavior. The main aim of this research was to prepare a high performance biocomposite coating material for air-duct application in aircraft. The biosilica ultra fine particle was prepared via thermo-chemical method and surface-treated using amino silane. The visco-elastic results revealed that the addition of silanetreated biosilica of 4 vol.% produced highest storage modulus of 7.2 GPa, loss factor of 0.51 and glass transition temperature of 91οC. The highest thermal conductivity of 0.3w/mK was observed for 4 vol.% of as-received biosilica in epoxy while the silanetreated biosilica of 4 vol.% gives 0.18w/mK. Similarly, the contact angle results revealed that the silane-treated biosilica of 4 vol.% retains higher contact angle of 85ο. This high performance epoxy biocomposite coating material could be used as a coating material for aircraft passenger air-duct to improve the condition of air and reduce the heat loss during flow during flow. Moreover the coating on air-ducts improves the life of welded joints, rivets and overall product. Keywords PMC . Biosilica . Surface treatment . DMA . Dielectric . Thermal conductivity
1 Introduction In recent years the role of bio materials in engineering applications are rapidly growing due to their demand, bio compatible nature, performance equal to synthetic material and economical process constraints [1]. The filler addition in polymer coating plays a major role in mechanical, thermal, wear and time-dependent properties [2]. Passenger inlet air-duct in any aircraft is made up of aluminum, which is subjected for repeated thermal fatigue due to the mixing of hot and cold air to improve
* M. Karthigairajan [email protected] 1
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Department of Mechanical Engineering, Anna University, Chennai, India Department of Mechanical Engineering, Rajalakshmi Institute of Technology, Chennai, India Department of Mechanical Engineering, Saveetha Engineering College, Chennai, India
the passenger inhale air quality, thus the joints and rivets are subjected to failure over a span of time. Moreover being a high conductive material (aluminum duct) the heat loss through aluminum surface is higher in the form of convective heat transfer. When the heat loss is higher more bleed air is required from engine to condition the inlet air for the passenger cabin. This phenomenon would increase the load of engine and affect the performance. To prevent the structural damage
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