Abstract
Polyamide (PA) microsphere was introduced into the nitrile butadiene rubber (NBR) matrix to prepare PA microsphere/NBR composites with various microsphere contents. The obtained samples were characterized by a scanning electron microscope, a moving die rheometer, a universal material testing machine and a high-speed block-on-ring wear testing machine to analyze the PA microsphere dispersity and the effects of PA microsphere on curing characteristics, mechanical and wear properties of the composites, respectively. The results showed that, the PA microspheres could be well dispersed in the NBR matrix. The curing time of the rubber compound was significantly prolonged by the introduction of PA microsphere due to its absorption of the accelerator. For the cured composites, the density and the rebound resilience were not obviously affected, but hardness and elongation-at-break increased, whereas the modulus at 300% elongation was reduced. The tear strength of the composites initially increased and then decreased with PA microsphere content increase, to indicate the optimal content of 1 phr. Furthermore, wear tests showed that the adhesion between the PA microsphere and the NBR matrix was excellent. PA microspheres were not separated from the matrix when sliding. With the PA microsphere content increase, the wear resistance of the NBR-based composite initially significantly improved and then remained essentially unchanged.
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Acknowledgements
The authors gratefully acknowledge the Foundation (No. KF2020007) of Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics, Qingdao University of Science and Technology and the National College Students’ Innovative Entrepreneurial Training Plan Program of China (No. 202110426028) for their financial support.
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Liu, G., Xu, L., Li, Z. et al. Preparation and properties of polyamide microsphere/nitrile butadiene rubber composites. Iran Polym J 31, 835–843 (2022). https://doi.org/10.1007/s13726-022-01041-z
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DOI: https://doi.org/10.1007/s13726-022-01041-z