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In this article, FTIR spectra and ESEM images were employed to evaluate the effect of stearic acid surface modification of Mg(OH)2. As a result, the absorbing peak intensity of organic group on Mg(OH)2 increased with the coating amount of stearic acid increasing and there was no so-called surface saturation as expected. The results indicated stearic acid surface treatment of Mg(OH)2 belonged to the acid–base reaction between stearic acid and Mg(OH)2, and it would not stop until Mg(OH)2 was reacted completely. In addition, stearic acid surface treatment of Mg(OH)2 had remarkable influence on the properties of ethylene vinyl acetate/Mg(OH)2 composites. With the increasing coating amount of stearic acid, the composites had decreased tensile strength, increased elongation at break, and deteriorated flame retardancy, compared with the composites filled with the uncoated Mg(OH)2. However, stearic acid surface treatment of Mg(OH)2 benefited processing ability of composites, and the composites had better processing ability as the coating amount of stearic acid increased. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
Four graphite powder fillers with different form and size were mixed with acrylonitrile butadiene rubber (NBR, acrylonitrile content at 26%) at 20, 40 and 60 phr of the filler loadings, and the obtained compounds were characterized by SEM, tensile test, friction and wear test. Through the SEM observation, it was found that the expanded graphite could not be broken down to small particles uniformly when blended with rubber on the twin-roller. In the tensile test, the graphite with the smallest size possessed the best reinforcement ability as expected. The tribological properties of the rubber were improved when adding more graphite. The largest graphite particles imparted the lowest friction coefficient of the composites among four fillers, but the submicrometer graphite provided the best wear property to NBR. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 4007–4015, 2006
