Dielectric Behaviour of Milled Carbon Fibre Reinforced Polysulphide Modified Epoxy Gradient Composites
[1]
Archana Nigrawal, Advanced Materials and Processes Research Institute Bhopal (formerly RRL Bhopal) Bhopal -462064, INDIA.
[2]
Navin Chand, Advanced Materials and Processes Research Institute Bhopal (formerly RRL Bhopal) Bhopal -462064, INDIA.
Milled carbon fibre reinforced polysulphide modified epoxy gradient composites were developed and characterized for their dielectric and DSC behaviour. It was found that dielectric constant of the composites increased with increase of milled carbon fibre content from 0.45 to 1.66 vol.% which confirmed the formation of a gradient structure in the composite. Both dielectric constant as well as loss tangent (tan ) increased with an increase of temperature. Dielectric constant data obtained for composites matched with the Maxwell Garnett model. Change in ’ values on adding milled carbon fibre is due to the modification of PSEP structure by milled carbon fibre. Dissipation factor (tan) peaks shifted towards lower temperature with increase of carbon content, which was due to the shift in Tg of PSEP. Relaxation time () determined at 80°C decreased from 3.35 x 10-5 to 2.25 x 10-5 (s) on increase of milled carbon fibre content from 0.45 to 1.66 volume percent. DSC scans also revealed the same Tg behaviour of graded composites. Storage modulus, E’, suddenly decreased after 62°C and 60.4 °C for PSEP and composite sample C having 1.66% carbon fibres respectively.
Milled Carbon, Polysulphide Modified Epoxy, Gradient, Dielectric Constant
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