Polyacrylate Rubbers ACM

Variation of melt viscosity for both the preblends and preheated blends with the blend ratio are shown in Fig. 19. There are two distinct regions in viscosity change with the addition of polyacrylic rubber (ACM) in the blends. First, in the higher shear rate region, the viscosity increases with the addition of the ACM (up to 40% ACM) in the blend and then it decreases. In the lower... 

Examples of vulcanizable elastomers include natural rubber (NR), styrene butadiene rubber (SBR), butadiene rubber (BR), ethylene-propylene-diene monomer-rubber (EPDM), butyl rubber (HR), polychloroprene or neoprene (CR), epichlorohydrin rubber (ECO), polyacrylate rubber (ACM), millable polyurethane rubber, silicone rubber, and flu-oroelastomers. Examples of thermoplastic elastomers include thermoplastic polyurethane elastomers, styrenic thermoplastic elastomers, polyolefin-based thermoplastic elastomers, thermoplastic polyether-ester (copolyester) elastomers, and thermoplastic elastomers based on polyamides. 

In 2004, Zeon Chemical Company began marketing a new TPV based on polyacrylate rubber (ACM) and nylon (polyamide). This new commercial TPV is designed to have a unique combination of good oil and high-temperature resistance. Therefore it can be substituted for some thermoset rubber in automotive under the hood applications. 

Figure 6.25 Nylon-6 derived from the polymerization of caprolactam Polyacrylate rubber (ACM) is synthesized as follows in Figure 6.26.

Polyacrylic rubber (ACM) is a polymer consisting of various monomers, including acrylic esters and cure site monomers. There are various systems, eg ammonium benzoate for epoxy functional ACM and soap/sulphur for active chlorine ACM. Crosslinking of epoxy functional ACM with isocyanuric acid yields fast cure. The characteristics and cure mechanism for this system are presented. 5 refs. 

Polyacrylate, designated ACM by ASTM, is a cost-effective family of heat and oil resistant polymers with a long history of use by the automotive industry, and to a much lesser extent for mechanical goods. These polymers operate very well at 150°C to 175°C in oU, hence are used in appheations operating above the capability of nitrile rubber, (NBR). Polyacrylate is also more cost-effective than hydrogenated nitrile (HNBR) and fluoroelastomer (FKM), thus may be used where the properties of the ACM meet all of... 

In an initial study, various antioxidants were evaluated in hydrogenated nitrile-butadiene rubber (HNBR), polyacrylic elastomer (ACM), and ethylene-acrylic elastomer (EAM), polymers which are frequently used in applications requiring high heat and oil resistance. Compounds of these elastomers were first immersed in ASTM 901 Oil to remove any soluble antioxidants that could be extracted in service, and later heat aged up to 21 days at 177°C in air. Similar agings were performed with samples placed in... 

Currently, a PA6-acrylic rubber-based TPV blend is commercialized by Zeon Chemical tmder the trade name of Zeotherm . Zeotherm is composed predominantly of a heat- and oil-resistant polyacrylate (ACM) elastomer, which has been dynamically vulcanized and well dispersed in a polyamide (PA6) thermoplastic matrix. Based on the patent literature (Aonuma et al. 1991),... 

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). 

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