Impact of the aluminum sulfate 18-hydrate particle size on the coordination crosslinking behaviors of acrylonitrile-butadiene rubber-aluminum sulfate 18-hydrate composites

摘要

In this study, aluminum sulfate 18-hydrate [Al-2(SO4)(3)center dot 18H(2)O] particles of different sizes, which were obtained via high-energy ball-milling technology, were successfully compounded with acrylonitrile-butadiene rubber (NBR) to fabricate crosslinked rubber composites. The results suggest that high-energy ball milling had no significant change on the crystal structure of Al-2(SO4)(3)center dot 18H(2)O, but it significantly reduced the particle size. The effects of the particles size on the coordination crosslinking behaviors and mechanical properties of the NBR-Al-2(SO4)(3)center dot 18H(2)O composites were fully explored. The coordination crosslinking reaction was demonstrated to occur between the nitrile group (CN) and Al(III). Moreover, with the decreasing particle size, the composites achieved a better interfacial adhesion and more crosslinking points, and this led to significant increases in the crosslinking density and the mechanical properties. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47717.