Preparation of Insulating Materials Based on Natural Rubber/Polyethylene Blend and Nanosilica
Main Article Content
Abstract
In the present work, a preparation of insulating materials based on polyethylene/natural rubber/nanosilica (PE/NR/nanosilica) blend was investigated. The optimal condition and composition for the blends were determined including types of natural rubber (i.e, RSS, SVR3L and deproteinized natural rubber-DPNR), type of nanosilica (silica_M with specific surface area of 340-420 m2 /g and silica_255G with specific surface area 285 m2 /g), blending methods and conditions. The mechanical properties, electrical insulation properties and thermal stability of the blends were characterized by tensile test, dielectric strength and thermal gravimetric analysis for each condition. It was found that the mass ratios of PE (L21 type) and NR of 20/80 and a silica content of 4% will result in a good mechanical and dielectric strength, which was 13.2 MPa and 100 kV/mm, respectively. RSS type and silica_M showed good compatibility with L21 in the blend at optimal conditions for the blend preparation. This result was further approved by SEM analysis and FTIR spectroscopy. The blend sample, L21/RSS@silica_M was exhibited better thermal stability and dielectric strength than L21/SVR3L@silica_M and L21/DPNR@silica_M samples and it demonstrated that L21/RSS@silica_M blend samples may be appropriate for electrical insulation application.
Keywords
Insulating materials, natural rubber, polyethylene, silica, dielectric strength
Article Details
References
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