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ABSTRACT Whitening phenomena of the EPDM composites with different inorganic filler compositions which were agedat 90℃ 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. Dependingon the filler compositions, there was no big difference in the whitening phenomena. The whitening materials were analyzedusing 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 identifiedto 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 † Corresponding Author. E-mail: sschoi@sejong.ac.kr Ⅰ.   EPDM (ethylene-propylene-diene rubber) ethylene propy-lene -  (~C=C~)  diene  , ethylene propylene    diene      .   diene 5-ethylidene-2-norbornene (ENB), dicyclopentadiene (DCPD), 1,4-hexadiene (HD)    ,   ENB    . EPDM              ,        . EPDM    , ,      .    , , , ,     .              .      ,                       .                     .

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