Tensile, torsional and bending behavior of multi-walled carbon nanotube reinforced polyurethane composites
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Tensile, torsional and bending behavior of multi‑walled carbon nanotube reinforced polyurethane composites Dinesh Kumar1 · Prashant Jindal1 Received: 10 October 2018 / Accepted: 31 October 2019 © Central Institute of Plastics Engineering & Technology 2019
Abstract Composites of polyurethane (PU)/multi-walled carbon nanotubes (MWCNTs) have been successfully prepared by using Solvent Mixing approach followed by injection molding. Field emission scanning electron microscopy has been performed and indicated reasonable dispersion of MWCNTs into PU matrix. Mechanical characterization shows that tensile modulus and stiffness of PU/MWCNT composites have been greatly improved by 23 times and 15 times, respectively, for 7 wt% in comparison with pure PU. Torsion and three-point bend tests revealed that torque and flexural modulus of PU composite with 7 wt% of MWCNTs have also been improved in comparison with pure PU. Excellent load transfer property of MWCNTs and their interaction with polymer matrix due to even dispersion are the suggested reasons for the improvement in mechanical properties. This significant improvement in mechanical properties of PU/MWCNT composite opens up several new avenues of mechanical applications like fabrication of shoes, gloves, helmet and other materials for armed force personnel. Keywords Tensile modulus · Solution mixing · Polyurethane · MWCNTs and injection molding
Introduction Since their discovery in 1991 by [1], CNTs gained more attention by researchers due to their wide range of application in several areas [2]. MWCNTs are considered to be most promising filler material due to their excellent mechanical strength, nanoscale diameter and very high aspect ratio. Researchers proved that MWCNTs * Prashant Jindal [email protected] Dinesh Kumar [email protected] 1
University Institute of Engineering and Technology, Panjab University, Chandigarh 160014, India
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Vol.:(0123456789)
International Journal of Plastics Technology
possess excellent value of Young’s modulus (1000 GPa) which is much higher than that of conventional carbon fibers (200–800 GPa) [3]. Moreover, in comparison with conventional carbon fibers, MWCNTs can be easily processed due to their small diameter [4]. MWCNTs also possess excellent value of tensile modulus (11–63 GPa) at outermost layer [5]. In addition to excellent mechanical properties, CNTs also possess superior thermal and electrical properties. CNTs are thermally stable up to 2800 °C in vacuum and have thermal conductivity about twice high as diamond, current carrying capability 1000 times higher than copper wire [6]. Therefore, due to their excellent properties, MWCNTs can be used for fabrication of fiberreinforced polymer composites, as they results in improved mechanical properties over neat polymer [7]. MWCNT-reinforced polymer composites attracted many researches in last few decades due to their improved mechanical properties as compared to polymer alone [8, 9]. The strategy of reinforcing MWCNTs in polymer has been extensively reviewed [10] in
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