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Gupta, Nandini
- Role of the Interface in Improving Surface Degradation Properties of Epoxy Nanocomposites
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Authors
Affiliations
1 Indian Institute of Technology Kanpur, Kanpur - 208 016, IN
1 Indian Institute of Technology Kanpur, Kanpur - 208 016, IN
Source
Power Research, Vol 4, No 2 (2008), Pagination: 179-184Abstract
It is widely accepted that the interface between polymer and filler particles plays a major role in modifying composite properties, both electrical and otherwise. In this work, we examine the role of the interface in affecting a particular electrical characteristic of the nanocomposite, viz. its resistance to surface degradation. Dielectric materials with improved resistance to surface discharges would help in ensuring better performance and greater reliability of apparatus in service. This paper takes a comprehensive look at the recent work by the authorsin this area, and tries to understandthe role of the interface in this context. Two essential features emerge. Increase in the interfacial zone at the expense of the bulk polymer imparts better degradation resistant properties to the composite specimen andtailoring of the chemical bond structure at the interface leads to further improvement.Keywords
Epoxy Nanocomposite, Surface Degradation, Pre-Processing, GPS, Interfacial Polymer.
- Dielectric properties of silicone rubber based composites with nano-sized fillers
Abstract Views :195 |
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Authors
Affiliations
1 Department of Electrical Engineering, Indian Institute of Technology,Kanpur-208016, IN
2 Department of Electrical Engineering, Indian Institute of Technology, Kanpur-208016, IN
1 Department of Electrical Engineering, Indian Institute of Technology,Kanpur-208016, IN
2 Department of Electrical Engineering, Indian Institute of Technology, Kanpur-208016, IN
Source
Power Research, Vol 13, No 1 (2017), Pagination: 85-90Abstract
Room Temperature Vulcanized Silicone Rubber (RTVSR) is one of the forms of silicone rubber used in outdoor insulating systems, usually in order to improve the pollution performance of ceramic insulation. RTV silicones are used to withstand mechanical and thermal stress. Introduction of nanosized particles inside RTVSR alters the dielectric properties of the polymer. In this work, we study the change in dielectric properties of silicone rubber on introduction of nanofillers. The dielectric properties investigated include complex permittivity and space charge accumulation. The nanofillers incorporated are alumina and barium titanate at 1% concentration (by volume). The nanofillers are mixed mechanically and by ultrasonication to obtain well dispersed nanocomposites.It is seen from the dielectric spectroscopy measurements that the alumina nanocomposite shows a higher complex permittivity compared to the barium titanate nanocomposite. Space charge measurements are carried out by the Pulsed Acoustic Method (PEA). The results indicate that the incorporation of nanoalumina leads to more space charge accumulation. On the other hand, the depletion of charge is faster with the incorporation of nanofillers.