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http://dx.doi.org/10.7473/EC.2020.55.4.306

A Comparison Study on Reinforcement Behaviors of Functional Fillers in Nitrile Rubber Composites  

Seong, Yoonjae (Department of Polymer-Nano Science and Technology and Department of Bionanotechnology and Bioconversence Engineering, Jeonbuk National University)
Lee, Harim (Department of Polymer-Nano Science and Technology and Department of Bionanotechnology and Bioconversence Engineering, Jeonbuk National University)
Kim, Seonhong (Department of Polymer-Nano Science and Technology and Department of Bionanotechnology and Bioconversence Engineering, Jeonbuk National University)
Yun, Chang Hyun (Department of Polymer-Nano Science and Technology and Department of Bionanotechnology and Bioconversence Engineering, Jeonbuk National University)
Park, Changsin (Department of Polymer-Nano Science and Technology and Department of Bionanotechnology and Bioconversence Engineering, Jeonbuk National University)
Nah, Changwoon (Department of Polymer-Nano Science and Technology and Department of Bionanotechnology and Bioconversence Engineering, Jeonbuk National University)
Lee, Gi-Bbeum (Beijing Advanced Innovation Center for Soft Matter Science and Engineering, State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology)
Publication Information
Elastomers and Composites / v.55, no.4, 2020 , pp. 306-313 More about this Journal
Abstract
To investigate the reinforcing effects of functional fillers in nitrile rubber (NBR) materials, high-structure carbon black (HS45), coated calcium carbonate (C-CaCO3), silica (200MP), and multi-walled carbon nanotubes (MWCNTs) were used as functional filler, and carbon black (SRF) as a common filler were used for oil-resistant rubber. The curing and mechanical properties of HS45-, 200MP-, and MWCNT-filled NBR compounds were improved compared to those of the SRF-filled NBR compound. The reinforcing effect also increased with a decrease in the particle size of the fillers. The C-CaCO3-filled NBR compound exhibited no reinforcing effect with increasing filler concentration because of their large primary particle size (2 ㎛). The reinforcing behavior based on 100% modulus of the functional filler based NBR compounds was compared by using several predictive equation models. The reinforcing behavior of the C-CaCO3-filled NBR compound was in accordance with the Smallwood-Einstein equation whereas the 200MP- and MWCNT-filled NBR compounds fitted well with the modified Guth-Gold (m-Guth-Gold) equation. The SRF- and HS45-filled NBR compounds exhibited reinforcing behavior in accordance with the Guth-Gold and m-Guth-Gold equations, respectively, at a low filler content. However, the values of reinforcement parameter (100Mf/100Mu) of the SRF- and HS45-filled NBR compounds were higher than those determined by the predictive equation model at a high filler content. Because the chains of SRF composed of spherical filler particles are similarly changed to rod-like filler particles embedded in a rubber matrix and the reinforcement parameter rapidly increased with a high content of HS45, the higher-structured filler. The reinforcing effectiveness of the functional fillers was numerically evaluated on the basis of the effectiveness index (��SRF/��f) determined by the ratio of the volume fraction of the functional filler (��f) to that of the SRF filler (��SRF) at three unit of reinforcing parameter (100Mf/100Mu). On the basis of their effectiveness index, MWCNT-, 200MP-, and HS45-filled compounds showed higher reinforcing effectiveness of 420%, 70%, and 20% than that of SRF-filled compound, respectively whereas C-CaCO3-filled compound exhibited lower reinforcing effectiveness of -50% than that of SRF-filled compound.
Keywords
NBR; functional fillers; smallwood-einstein equation; guth-gold equation; modified guth-gold equation;
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