Anisotropic studies of multi-wall carbon nanotube (MWCNT)-filled natural rubber (NR) and nitrile rubber (NBR) blends |
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Authors: | Pattana Kueseng Pongdhorn Sae-oui Chakrit Sirisinha Karl I Jacob Nittaya Rattanasom |
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Institution: | 1. Department of Chemistry, Faculty of Science, Mahidol University, Bangkok 10400, Thailand;2. National Metal and Materials Technology Center, 114 Thailand Science Park, Klong-Luang, Pathumthani 12120, Thailand;3. Research and Development Centre for Thai Rubber Industry (RDCTRI), Faculty of Science, Mahidol University, Salaya, Nakhon Pathom 73170, Thailand;4. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA;5. G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA;6. Rubber Technology Research Centre, Faculty of Science, Mahidol University, Salaya, Nakhon Pathom 73170, Thailand;g Institute of Molecular Biosciences, Mahidol University, Salaya, Nakhon Pathom 73170, Thailand |
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Abstract: | 50/50 NR/NBR blends with various MWCNT loadings were prepared by mixing with MWCNT/NR masterbatches on a two-roll mill and sheeted off at the smallest nip gap. Then, the effect of milling direction, machine direction (MD) and transverse direction (TD), on the mechanical and electrical properties of the blends was elucidated. Dichroic ratio and SEM results confirmed that most of the MWCNTs were aligned along MD when MWCNT was less than 4 phr, and the number of agglomerates increased when MWCNT was more than 4 phr. Additionally, anisotropic properties were clearly observed when 4 phr MWCNT was loaded. At 4 phr MWCNT, 100% modulus and tensile strength in the MD were about 1.5 and 1.3 times higher than those in the TD, respectively. Moreover, electrical conductivity in the MD was superior to that in the TD by about 3 orders of magnitude. Results from dynamic mechanical tests also showed that the maximum tan δ in the MD sample was lower than that in the corresponding TD sample. In addition, the storage modulus at 30 °C for the MD sample containing 4 phr MWCNT was 1.15 higher than that of the corresponding TD sample. This stronger reinforcement efficiency resulted from the combination of the greater alignment and dispersion of most MWCNTs in the MD sample. |
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Keywords: | MWCNT NR/NBR blends Dichroic ratio Mechanical properties Electrical conductivity |
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