Abstract
Radiation crosslinking of flexible PVC (polyvinyl chloride) was studied with the aim of developing a suitable insulation to be used in various electrical appliances. PVC insulation material containing three different sensitisers like tetra-ethyl glycol dimethacrylate, ethylene glycol dimethacrylate and trimethylol propane trimethacrylate were irradiated with electron beam radiation up to 150 kGy dose and the effect of sensitiser on the radiation cross-linking has been investigated. Besides this, thermal stability of insulation having stabilisers (such as tri-basic lead sulphate and di-basic lead phthalate) has also been studied. Tensile strength, volume resistivity, and decomposition temperature, have been found to be improved under irradiation, whereas long term aging characteristics at elevated temperature deteriorate. However glass transition temperature does not show significant change up to 100 kGy dose. It was also observed that TMPTM (tri-methylol propane tri-methacrylate) is a better cross linking agent, whereas DBLP (di-basic lead phthalate) appears to contribute towards better thermal stability.
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