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Influence of Silica (SiO2) Loading on the Thermal and Swelling Properties of Hydrogenated-Nitrile-Butadiene-Rubber/Silica (HNBR/Silica) Composites

Authors :
Amin Muhammad
Khattak Abraiz
Ali Muhammad
Source :
Open Engineering, Vol 8, Iss 1, Pp 205-212 (2018)
Publication Year :
2018
Publisher :
De Gruyter, 2018.

Abstract

Hydrogenated-Nitrile-Butadiene-Rubber (HNBR) is known for its good physical strength. It is a widely used rubber in electrical insulation and other high performance applications. Performance of HNBR is affected in high temperature and an aggressive fluid environment. Adding silica to HNBR may overcome this problem. In order to investigate the effect of fluids and temperature on HNBR/silica composites we prepared multiple composites of HNBR with 8.3, 16.7, 33.4, 50 and 66.7 phr of silica (SiO2) by two roll compounding method. Swelling index and thermo gravimetric analyses were performed. Calculations of swelling indexes were performed at different time periods with ethanol, toluene and water. For thermo gravimetric analysis (TGA), thermo grams of samples were obtained and % char yields at 550 °C were analyzed for all samples. Improvements with the addition of silica were recorded up to a great extent in both analyses. Swelling index decreased with the addition of silica as compared to neat HNBR and reached an optimum position with 50 phr silica loading in ethanol, 8.3 phr in water and 66.7 phr in toluene. Moreover, the HNBR composite with 66.7 phr of silica was found to be the highest thermally stable sample and lost less than 60% of weight at 550 °C in comparison to neat HNBR in which 80% of weight loss occurred at 550 °C.

Details

Language :
English
ISSN :
23915439
Volume :
8
Issue :
1
Database :
Directory of Open Access Journals
Journal :
Open Engineering
Publication Type :
Academic Journal
Accession number :
edsdoj.90a7c37853eb4484bd9eb3ab31a20150
Document Type :
article
Full Text :
https://doi.org/10.1515/eng-2018-0025