Ethylene Propylene Terpolymer EPDM

Occasionally polymers are used to increase the viscosity of oil-base and synthetic-base muds. The polymers for this use are typically sulfonated polystyrenes or ethylene—propylene terpolymers (EPDM) (54,55). Such polymers are usually used in conjunction with an organopbilic clay. 

EPDM-g-PMMA was produced through ATRP with CuBr/bipyridine [80]. The graft copolymer, which had an ethylene-propylene terpolymer (EPDM) backbone and PMMA branches, was prepared from brominated EPDM that was produced with NBS to introduce allylbromine moiety on the backbone. Resulting EPDM-g-PMMA graft copolymers were characterized by solvent extraction, infrared (IR), and NMR techniques. 

There are two general types of polymers based on ethylene and propylene ethylene-propylene rubber (EPM) and ethylene-propylene terpolymer (EPDM). EPM accounts for approximately 20 percent of the polyolefin rubber produced. Comprising a totally saturated polymer, these materials require free-radical sources to cross-link. EPDM was developed to overcome this cure... 

IPP-EPM blends were generally considered to be immiscible (92-95). Chen et al. (96) have reported miscibility and a LCST in blends of isotactic polypropylene and an ethylene-propylene terpolymer (EPDM). Seki et al. (97) reported that iPP was miscible with EPM with both 19 and 47 mol% of ethylene based on both transmission electron microscopy (TEM) and SANS. However, the molecular weight of the iPP was below 10, OOOgmoP. More recently both Nitta et al. (98) and Kamdar et al. (99) reported that the miscibility between iPP and EPM, whose molecular weight is higher than 100,000 g moP, is strongly dependent on ethylene content in EPM. The miscibility increases with decrease of ethylene content. IPP was miscible with EPM with ethylene content lower than around 17 mol% based on both dynamic mechanical analysis (DMA) and TEM. The EPM domain sizes decrease with decrease of ethylene content as shown in Fig. 2.3. 

Figure 9- Thermal aging in air of an ethylene-propylene terpolymer (EPDM).

Ethylen Propylene, terpolymers (EPDM) Fluororubber used for hoses, compensators, fitting internals... 

Figure 9.1. Phase-contrast micrographs of blends of chloroprene (CR), nitrile rubber (NBR), ethylene-propylene terpolymer (EPDM), and chlorobutyl rubber with styrene-butadiene rubber (SBR). The SBR phase appears white for the blends with CR and NBR, and dark for the blends with EPDM and chlorobutyl rubber. At low concentrations, the admixed rubber is the dispersed phase at higher concentrations, a phase inversion occurs and the admixed rubber becomes the matrix. (Callan et al, 1971.)...

Ethylene-propylene terpolymer (EPDM) is synthesized from ethylene, propylene, and a third monomer, a nonconjugated diene. The diene permits conventional sulfur vulcanization. The elastomer is exceptionally resistant to radiation and heat. The glass transition temperature is -60°C, and electrical properties are good. 

An elastomeric copolymer based on ethylene and propylene prepared in Ziegler-Natta polymerization. When small amount of a diene monomer is added, the resulting polymer becomes ethylene-propylene terpolymer, EPDM. 

The comparison between the effects brought about during EB-irradiation of natural rubber, ethylene-propylene terpolymer (EPDM) and nitrile rubber emphasizes the satisfactory behavior of the last polymer [99C1, GOBI]. The gel fraction, chain scission and modification of the networks in these elastomers explain the changes in mechanical properties, i.e. the modulus increased and the elongation at break decreased with an increase in the irradiation dose (Fig. 66). 

Copolymerization of ethylene with another alkene, as with the ethylene-propylene rubbers (EPM), or possibly with, in addition, a third monomer to provide the rubber with unsaturation, as with the ethylene-propylene terpolymers (EPDM). 

The curing system developed for butyl rubbers has been extended to ethylene-propylene terpolymer (EPDM). Mechanisms of curing by p-dinitrosobenzene have been discussed. The cured cements are promising as outdoor sealants in terms of oxidative stability. 

VISTALON elastomers are classified generically as either ethylene-propylene copolymers (EPM) or ethylene-propylene terpolymers saturated hydrocarbon chain which makes them highly resistant to attack by chemical agents such as oxygen, ozone, acids, and the like that seek to react at the site of a double bond. 

There are many well-known examples of industrial problems that arise in ternary systems of two polymers and a low molecular weight compound. Consider a blend of a polar elastomer (e.g., butadiene acrylonitrile copolymer, NBR) and a hydrocarbon elastomer (e.g., ethylene propylene terpolymer, EPDM (Section 1.3.2))... 

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