Effect of organoclay content on mechanical and rheological properties of dynamically cross-linked acrylonitrile-butadien
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Effect of organoclay content on mechanical and rheological properties of dynamically cross‑linked acrylonitrile‑butadiene rubber/poly(ethylene‑co‑vinyl acetate)/organoclay nanocomposites Mohammad Razavi‑Nouri1 · Alireza Sabet1 · Maryam Mohebbi1 Received: 7 July 2019 / Revised: 6 October 2019 / Accepted: 8 December 2019 © Springer-Verlag GmbH Germany, part of Springer Nature 2019
Abstract Blends of poly(ethylene-co-vinyl acetate) (EVA) and acrylonitrile-butadiene rubber (NBR) with NBR content of 50 wt% and organoclay (OC) contents of 1, 3, 5 and 7 wt% have been prepared and cross-linked with 0.3 wt% dicumyl peroxide (DCP) in an internal mixer. The results obtained from x-ray diffraction and transmission electron microscopy for the uncross-linked nanocomposites containing 7 wt% OC show that although a part of the nanofiller layers are exfoliated, the rest of the particles remained almost intercalated. However, it is found that cross-linking with DCP markedly increased the amount of exfoliated platelets. The results also reveal that gel content and cross-linking rate slightly increased in the presence of the OC. The analysis of data obtained from the tensile experiments indicates that the tensile modulus and yield stress of the nanocomposites are superior to those of the unfilled blend and the values improve with the increase in the OC content. Apart from the value of strain at break, all other mechanical properties studied are found to be higher for the cross-linked nanocomposites than those of their uncross-linked counterparts. Moreover, the relaxation ratio and relaxation rate index are decreased with an increase in the OC content for the uncross-linked and cross-linked materials. Keywords Acrylonitrile-butadiene rubber (NBR) · Poly(ethylene-co-vinyl acetate) (EVA) · Nanocomposite · Organoclay · Dynamic cross-linking
* Mohammad Razavi‑Nouri [email protected] 1
Iran Polymer and Petrochemical Institute, P.O. Box: 14975‑112, Tehran, Iran
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Vol.:(0123456789)
Polymer Bulletin
Introduction The existence of economic and scientific barriers against the commercialization of novel polymers from new monomers and the growth of knowledge on polymer blending by which the materials produced could have superior physical and mechanical properties than those of the parent components, are the driving forces to push for more substantial research in making polymer blends [1, 2]. Nowadays, thermoplastic elastomers (TPEs) play a key role in the field of polymer industry because of their relatively good elasticity and easy processability. TPEs are rubbery materials that behave similar to conventional vulcanized rubbers; however, they can be processed as thermoplastic polymers [3, 4]. Thermoplastic vulcanizates (TPVs) can be regarded as a special class of TPEs in which a rubber is dynamically vulcanized while it is being mixed at the same time with a thermoplastic polymer at high shear and elevated temperature. The temperature should be high enough to melt the thermoplastic phase and also activate the vulcanizing agent
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