Ethylene Acrylic Elastomer AEM

There are other specialty, oil-resistant elastomers that can substitute for epichloro-hydrin elastomers for the right price. Of course, these alternate elastomers would require another technical evaluation before use. 

Tight Supply Situations in the Past and Future Supply Outlook 

Epichlorohydrin rubber consumption has not expanded greatly. For a decade the epichlorohydrin market was stagnant. Today, Zeon has about three-fourths of this market with production plants in Japan and the United States. Epichlorohydrin is also produced in China. 

DuPont first introduced ethylene acrylic elastomer in 1975 as a moderately priced oil- and heat-resistant rubber, which was only surpassed by the fluoroelastomers and fluorosilicones, which are much more costly. AEM is known for imparting a good combination of properties such as good compression set resistance, high vibration damping, and good low-temperature flexibility. 

AEM as a copolymer is produced from the reaction of ethylene with methyl acrylate 

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E. Shiva Kumar, C. Das, K. Banik, and G. Mennig. Viscoelastic properties of in situ composite based on ethylene acrylic elastomer (AEM) and liquid crystalline polymer (LCP) blend. Compos. Sci. Tech., 67(6) 1202-1209, May 2007. 

There are various types of carbon nanofillers which include carbon black, multi walled carbon nanotubes (MWCNTs), and single walled carbon nanotubes (SWCNTs) [27]. In this section the effect of these nano fillers on viscoelastic behavior is thoroughly discussed. The physicomechanical properties of conductive carbon black (CCB) filled ethylene acrylic elastomer (AEM) vulcanizates have been reported by B.P. Sahoo et al. They have discussed thoroughly about the effect carbon black concentration on the viscoelastic behavior of CCB-AEM nanocomposites with respect to temperature variation. Figure 10a, b represents the variation of storage modulus and loss modulus with temperature. It is observed that the value of storage modulus (E ) increased with increase in filler loading in the... 

Ethylene acrylic elastomer AEM (official ASTM abbreviation)... 

The Handbook of Specialty Elastomers was conceived as a single reference source for the rubber compounder with some experience in designing parts in the rubber industry. The definition of specialty elastomers referenced in this publication is heat, oil, fuel, and solvent-resistant polymers that include polychloroprene (CR), nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), fluoroelastomer (FKM), polyacrylate (ACM), ethylene acrylic elastomer (AEM), polyepichlorohydrin (CO, ECO), chlorinated polyethylene (CPE), chlorosulfonated polyethylene (CSM), ethylene vinyl acetate (EAM), and thiokol (T). 

AEM Ethylene acrylic Elastomer Copolymer of ethylene, methyl acrylate (peroxide curable). Terpolymer contains cure site monomer Weather, ozone, hydrocarbon lubricants/greases, hydraulic fluids Aromatic hydrocarbons, esters, gasoline, ketones... 

Struktol WB 42 at a 1 % level, combined with 1 % stearic acid, is a good combination for general purpose use in peroxide-cured AEM ethylene acrylic elastomer compounds. Vamac AEM stocks using hexamethylene diamine carbamate (Diak No. 1) as the curative, requires 1% stearic acid plus 0.3% of a stearamide such as Armeen 18D from Akzo and 0.8% of Struktol WS 180. These chemicals act as coagents for mill release. Struktol WB 42, Struktol WS 180, and Armeen 18D also serve as mold release agents. 

The ethylene segments in this elastomer are amorphous (noncrystalline), so their presence improves the low-temperature properties of the AEM. On the other hand, the methyl acrylate segments are somewhat polar and improve oil resistance. 

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