Abstract
Molecular dynamics (MD) simulations were used to map defect-free, single-vacancy (SV)-defective and vacancy-adsorbed-atom (VA)-defective carbon nanotubes (CNTs) using 2,2,4-trimethyl-1,2-dihydroquinoline (antioxidant RD) and nitrile-butadiene rubber (NBR) monomer models. Three groups of composites, CNT/RD/NBR, SV-CNT/RD/NBR, and VA-CNT/RD/NBR, were modeled. The mechanical and tribological properties of these composites were investigated, and the thermal-oxidative aging mechanism was analyzed via molecular dynamics (MD) simulations. The results showed that the antioxidant RD had the best protection effect on NBR in the CNT/RD/NBR composite. In addition, the Young's, bulk, and shear moduli of the CNT/RD/NBR composites were significantly improved, and the friction coefficient and wear rate were reduced compared with those of the SV-CNT/RD/NBR and VA-CNT/RD/NBR composites. The mean square displacement, radial distribution function, and relative concentration distribution within the three composites were also calculated separately. The effects of SV-CNTs and VA-CNTs on the NBR composite matrices were elucidated from a microscopic perspective. The results showed that the introduction of SV and VA defects reduced the interfacial interaction of NBR composites and alleviated the antioxidant RD dispersion and migration within the composites.
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Acknowledgements
The authors would like to thank the National Natural Science Foundation of China (Grant No.51903148) and Guangdong Basic and Applied Basic Research Foundation, China (No. 2021A1515012273)and 2021 Liaoning Province " Goals and Responsibilities " science and technology research projects (NO. 2021JH1/10400097 and 2021JH1/10400084).
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All authors contributed to the study conception and design. Material preparation and data analysis were performed by Cheng Qian and Yunlong Li. The first draft of the manuscript was written by Cheng Qian and Yunlong Li. Funding acquisition and supervision were done by Jing Zhao and Shijie Wang.
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Qian, C., Li, Y., Zhao, J. et al. Effect of single-vacancy- and vacancy-adsorbed-atom-defective CNTs on the mechanical and tribological properties of NBR composites: molecular dynamics simulations. J Polym Res 30, 99 (2023). https://doi.org/10.1007/s10965-023-03470-7
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DOI: https://doi.org/10.1007/s10965-023-03470-7