Investigation on the properties of rubber composites containing modified clay
Abstract
Purpose
The purpose of this paper is to evaluate the efficiency of organobentonite (OB) as reinforcing filler in acrylonitrile-butadiene rubber (NBR). The composites were prepared using different loadings of OB and studying in details their properties. A series of OB was modified using surfactant N-cetyl-N, N, N-trimethyl ammonium bromide (CTAB) with concentrations 0.5, 1 and 2 cation exchange capacity (CEC) of bentonite.
Design/methodology/approach
The different bentonites were characterized using different analytical and spectro-photometric techniques, such as infra red, X-ray diffraction, thermogravimetric analysis and scanning electron microscopy, while rubber vulcanizate rheological, morphological, swelling and thermal properties were examined using different standard instrumental testing and methods.
Findings
The study revealed that the modification of bentonite using CTAB showed significant enhancement on NBR properties, and the optimum filler loading was 12 phr for both 0.5CEC OB and 2CEC OB. These modified bentonites improved reinforcing properties to NBR vulcanizates. Also, results showed that composites exhibited remarkable improvements in tensile strength, elongation at break and hardness in the presence of modified bentonite and also an increase in thermal stability.
Research limitations/implications
Na-B cannot be applied in rubber matrix without modification because it is incompatible with it.
Practical implications
The modified bentonite is considered as efficient reinforcing filler which can replace other fillers because it has lower surface energy and improved intercalating behaviour in rubber matrix.
Originality/value
These papered bentonites are cheap with relatively high purity, which make rubber/clay composites emerge as new class of material and can be used in different fields other than rubber.
Keywords
Citation
El-Sabbagh, S.H., Mahmoud, D.S., Zawrah, M.F., Ahmed, N.M. and Sabaa, M.W. (2015), "Investigation on the properties of rubber composites containing modified clay", Pigment & Resin Technology, Vol. 44 No. 3, pp. 131-142. https://doi.org/10.1108/PRT-09-2014-0073
Publisher
:Emerald Group Publishing Limited
Copyright © 2015, Emerald Group Publishing Limited