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http://dx.doi.org/10.7473/EC.2012.47.3.210

Influence of Filler and Cure Systems on Whitening of EPDM Composites by Formation of Metal Salt  

Chung, Hye-Seung (Department of Chemistry, Sejong University)
Choi, Sung-Seen (Department of Chemistry, Sejong University)
Publication Information
Elastomers and Composites / v.47, no.3, 2012 , pp. 210-215 More about this Journal
Abstract
Whitening phenomena of the EPDM composites with different inorganic filler compositions which were aged at $90^{\circ}C$ for 7 days in air and tap water atmospheres, respectively, were investigated. The aged samples in tap water containing stearic acid exhibited severe whitening phenomena, while all the samples aged in air did not show any whitening. Depending on the filler compositions, there was no big difference in the whitening phenomena. The whitening materials were analyzed using gas chromatography/mass spectrometry (GC/MS), image analysis, energy-dispersive X-ray spectroscopy (EDX), and attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR). The whitening materials were identified to be salts of stearic acid. The salts of stearic acid were formed by reaction of metal cation in tap water and stearic acid in the sample.
Keywords
whitening; EPDM; cure system; metal cation; fatty acid;
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