Ethylene-acrylic rubbers

Ethylene-Acrylic Rubber (EACM, AEM) Designation in ISO 1629 - N/A Repeat Unit... 

Studies at the International Tin Research Institute showed that 2.5% zinc stannate strongly enhanced the flame retardant action of ATH in ethylene-acrylic rubber, and enhanced the char yield (34) (Fig. 5). 

Figure 5. Effect of tin compounds on oxygen index vs. temperature of ethylene-acrylic rubber containing 50% ATH. Key 0, 2.5% ZnSn(OH)6 , 2.5% Sn02 O. no tin.

Figure 5. Effect of temperature on the flammability of ethylene-acrylic rubber samples.

Certain inorganic tin compounds are effective flame-retardant synergists when incorporated at a 2.5% level into a 50% ATH-filled ethylene-acrylic rubber composition. Tin-containing elastomer formulations retain their flame-retardant superiority at environmental temperatures up to 250°C, and samples containing 2.5% ZnSn(0H)g do not sustain combustion in air at this temperature. 

Ethylene-vinyl acetate rubbers (EAM)—this chapter Ethylene-acrylate rubbers (AEM)—this chapter Fluorombbers (FKM, CFM, FFKM, FZ, AFMU ete.)—Chapter 13 Silicone and fluorosilicone rubbers (MQ, VMQ, PMQ, PVMQ and FVMQ)— Chapter 29... 

Ethylene-acrylic rubber is produced from ethylene and acrylic acid. As with other synthetic elastomers, the properties of the EA rubbers can be altered by... 

Ethylene-acrylic rubber also has outstanding resistance to hot water. Its resistance to water absorption is very good. Good resistance is also displayed to dilute acids, aliphatic hydrocarbons, gasoline, and animal and vegetable oils. 

Ethylene-acrylic rubber is not recommended for immersion in esters, ketones, highly aromatic hydrocarbons, or concentrated acids. Neither should it be used in applications calling for long-term exposure to high-pressure steam. 

Acrylate-butadiene and acrylic ester-acrylic halide rubbers are similar to ethylene-acrylic rubbers. Because of its fully saturated backbone, the pol)maer has excellent resistance to heat, oxidation, and ozone. It is one of the few elastomers with higher heat resistance than EPDM. 

Ethylene Acrylic Rubber Copolymers of ethylene and acrylic esters. Has good toughness, low temperature properties, and resistance to heat, oil, and water. Used in auto and heavy equipment parts. 

Ishida et reported melt blending of PLA with four types of common rubbers, ethylene-propylene copolymer (EPM), ethylene-acrylic rubber (EAM), acrylonitrile-butadiene rubber (NBR) and isoprene rubber (IR), to toughen PLA. All blends showed separated phase morphology where the elastomer phase was homogeneously distributed in the form of small droplets in the continuous PLA phase. Izod impact testing showed that toughening was achieved only when PLA was blended with NBR, which showed the smallest rubber particle size in the blends. In addition, the interfacial tension between both phases, PLA and NBR, was the lowest. 

Acrylate-butadiene rubber (ABR) and acrylic ester-acrylic halide rubber (ACM) are very similar to the ethylene-acrylic rubbers having good resistance to sun, weather, and ozone. As a result, the ABR and ACM rubbers find application where resistance to atmospheric conditions and heat are required. 

The monitoring of airborne monomer concentrations around subsequent processing operations may provide one index of the efficiency of such stripping. For example, Nutt has found chloroprene concentrations as high as 20 ppm around polychloroprene latex dipping, whilst 18-45 ppm of methyl acrylate has been found next to dies during the extrusion of Vamac ethylene/acrylic rubber at temperatures between 71 and 93°C. ... 

Polyurethane nJ ber (diieocyanate) Silicone rubber Ethylene-acrylate rubber Ethylene vinyl acetate rubber Chloroeulfonated polyethylene Chlorinated polyethylene Chloroprene rubber Ethylene propylene-ter rubber But rubber Notbomene rubber Styrene-butadiene rubber Butadiene rubber Natural rubber... 

The blends of PBT or PET with poly(ethylene-acrylate) rubber [116,117], PBT with polybutadiene rubber [121], and PBT with EPDM [122,123] obtained by in situ reactive blending were also examined. TPEs by grafting of PBT on the acryl units of the poly(ethylene-acrylate) rubber or by covulcanization of unsaturated PBT with polybutadiene rubber were also reported. The covulcanization of unsaturated PEE with EPDM was studied by Sieminski [73]. Some authors modified PBT with small amounts of rubber in order to improve its impact resistance [190]. Manas-Zloczower et al [191] and Utracki [192] reviewed the procedures of preparation of such blends. 

The silicone rubbers show not only very good heat resistance, like the fluorocarbons, but also very good properties at low temperatures. The uses of these materials are well established where operation over a wide service temperature range is required. In recent years, however, these materials have been facing competition, for some of the less stringent applications, from some of the less expensive speciality materials. These include the acrylic rubbers and the ethylene-acrylate rubbers already mentioned. On the other hand there has become available a special group of silicone materials which may be vulcanised at room temperature, the so-called RTV rubbers. 

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