RETRACTION : Curing, Mechanical, and Tribological Properties of Hydrogenated Nitrile Butadiene Rubber Reinforced With Al ₂ O ₃ Nanoparticles

RETRACTION: W. Yang , C. Wang , Z. Liu , and J. Tan , “,” Polymer Composites 43 , no. ( 2022 ): 4588 – 4599 , https://doi.org/10.1002/pc.26714 . The above article, published online on 07 May 2022 in Wiley Online Library ( wileyonlinelibrary.com ), has been retracted by agreement between the authors; the journal Editor‐in‐Chief, Alessandro Pegoretti; and Wiley Periodicals LLC. The retraction has been agreed due to the authors' realization that sub‐figure 11c depicts a part of the sample's friction and wear testing process. It does not represent the typical wear morphology of the HNBR composite filled with nano‐Al₂O₃ (100 nm) throughout the test. Consequently, with the request of the authors, we have decided to retract this article.