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Chemical, Water And Thermal Durability Of Silicone Rubber/Ethylene Vinyl Acetate Blends

Balan, Ganesh and Unnikrishnan, G (2006) Chemical, Water And Thermal Durability Of Silicone Rubber/Ethylene Vinyl Acetate Blends. Materials Research Innovations. pp. 305-320. ISSN 1433-075X

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Abstract

The chemical, water and thermal resistant characteristics of silicone rubber/ethylene vinyl acetate blends (SR/EVA) crosslinked by dicumyl peroxide have been investigated. For the study, chemical reagents viz; mineral acids (concentrated and 2N HCl, HNO3 and H2SO4), alkalies (concentrated and 5% NH4OH, KOH and NaOH), 2% KMnO4 and K2Cr2O7 were selected. The results have been reported in terms of the complete dissolution, weight loss or gain of the samples in aggressive liquid environment and in comparison with control films based on SR and EVA as well as with a commercial silicone based film, KYNStick®. It has been found that the concentrated acids, particularly H2SO4, result in the surface charring of the samples followed by dimensional change and weight loss. This has been attributed to the micro or macro fragment degradation of the matrix. However, dilute acids, alkalies and as well as 2% KMnO4 and K2Cr2O7 solutions have been found to cause no substantial degradation on the blends. The exposure of the samples to distilled water and seawater showed no significant absorption, swelling, disintegration or dissolution characteristics. The thermal stability of the samples at 100 ºC has been found to be increased, probably due to the additional crosslink formation. However at 200 ºC a reduction in percentage weight has been observed for all the samples, attributed to the main chain/side chain scission of the matrix. At higher EVA content, the blends showed a reduction in swelling, percentage weigh loss, disintegration and degradation features. This has been explained in terms of the low chemical and thermal susceptibility of the crystallites of EVA into the matrix. Complementary results have been obtained from the morphological and the tensile strength retention analysis of the treated samples, suggesting the significance of blending SR with EVA for applications in different thermal and chemical environment.

Item Type: Article
Uncontrolled Keywords: blends chemical durability, thermal durability silicone rubber ethylene vinyl acetate
Subjects: Engineering > MIT Manipal > Biotechnology
Depositing User: MIT Library
Date Deposited: 15 Mar 2014 11:14
Last Modified: 15 Mar 2014 11:14
URI: http://eprints.manipal.edu/id/eprint/139127

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