Ethylene-propylene-diene rubber EPDM

Peak Notation Assignment of Main Peaks Molecular Weight Retention Index Relative Intensity 

2) Tsuge, S. Sugimura, Y. Nagaya, T. J. Anal. Appl Pyrolysis 1980,1, 221. 

4) Yamada, T. Okumoto, T. Ohtani, H. Tsuge, S. Rubber Chem. Technol. 1990, 63, 191. 

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Comparison of Properties of Sulfur- and Peroxide-Cured Ethylene-Propylene-Diene Rubber (EPDM)... 

Ethylene-propylene-diene rubber (EPDM) 8 % Acrylonitrile-butadiene rubber (NBR) 4 %... 

Ethylene-propylene-diene rubber EPDM (Keltan 512 55 vol.% ethylene)... 

Typical strain dependences of volume resistivity are shown in Figure 12.7 the results are related to an ethylene-propylene-diene rubber (EPDM) (supplied by ExxonMobil Chemical under the trade name Vistalon 5601) filled with 6 phr of MWNTs that is at a filler content well above the percolation threshold (determined around... 

As a typical example, Figure 12.15 shows the Raman spectra of an unfilled ethylene-propylene-diene rubber (EPDM). The Raman spectra of pure MWNTs, pure CB and of a EPDM / MWNTs composite are also given. The D, G and G bands are respectively located at 1348, 1577 and 2684 cm-1 in the Raman spectrum of the multiwall carbon nanotubes. The Raman spectrum of pure carbon black (CB) remains dominated by the bands associated with the D and G modes at 1354 and 1589 cm1 respectively, even when the carbons do not have particular graphiting ordering (Figure 12.11). This fact has been widely discussed by Robertson (84) and Filik (85). Amorphous carbons are mixtures of sp3 (as in diamond) and sp2 (as in graphite) hybridised carbon. The it bonds formed by the sp2 carbons being more polarisable than the a bonds formed by the sp3 carbons, the authors conclude that the Raman spectrum is dominated by the sp2 sites. 

In addition to titanium-based Ziegler-Natta catalysts, vanadium-based systems have also been developed for PE and ethylene-based co-polymers, particularly ethylene-propylene-diene rubbers (EPDM). Homogeneous (soluble) vanadium catalysts produce relatively narrow molecular mass distribution PE, whereas supported V catalysts give broad molecular mass distribution.422 Polymerization activity is strongly enhanced by the use of a halogenated hydrocarbon as promoter in combination with a vanadium catalyst and aluminum alkyl co-catalyst.422,423... 

The copolymerization of ethylene with nonconjugated dienes is of significant interest due to its applicability to ethylene-propylene-diene rubber (EPDM) [84]. The cyclic dienes such as 1,3-cyclopentadiene, dicyclopen-tadiene, and vinylcyclohexane copolymerize with ethylene catalyzed by rac-Et(Ind)2ZrCl2/MAO (Eq. 16) [85]. 

Effects of maleated ethylene-propylene diene rubber (EPDM) on the thermal stability of pure polyamides, and polyamide/EPDM and polyamide/poly (ethylene terephthalate) blends kinetic parameters and reaction mechanism/Zl. Vieira, V.L. Severgnini, D.J. Maasra MS. Soldi, E.A Pinheiro, AT.N. Pires and V. ScAAilPolymer degradation and stability (2001), 74 1 151-157. 

Reference 7 reviews a number of electron microscopy studies of ionomer morphology in the period up to 1979. None of these studies makes a convincing case for the direct imaging of ionic clusters. This is because of the small size of the clusters (less than 5 nm based on scattering studies) and difficulties encountered in sample preparation. The entire problem was reexamined in 1980(21). In this study ionomers based on ethylene-methacrylic acid copolymers, sulfonated polypentenamer, sulfonated polystyrene and sulfonated ethylene-propylene-diene rubber (EPDM) were examined. The transfer theory of imaging was used to interpret the results. Solvent casting was found to produce no useful information about ionic clusters, and microtomed sections showed no distinct domain structure even in ionomers neutralized with cesium. Microtomed sections of sulfonated EPDM, however,... 

Tables II, compounds to 9 inclusive.) Linear-Low Density Polyethylene (Table III, compounds and 8) Ethylene Propylene Diene Rubber (EPDM) (Table IV, compounds 6 and 8). 

Figure 15.2 Reactions of bis(diisopropyI)-thiophosphoryI disulfide (DIPDIS) with ethylene-propylene-diene rubber (EPDM) and zinc oxide. (From Reference 32 with permission from John Wiley Sons.)...

Synthetic rubber (ethylene-vinylacetate rubber, EVM ethylene-propylene-diene rubber, EPDM) - new formulas of these materials dehver coatings that are not affected by environmental impact (UV, ozone, humidity, chemicals) and have excellent light transmission (up to 80%). A silica filler provides high tensile strength, high flexibility and very good foldabil-ity, even at low temperatures. 

Polyvinyl chloride (PVC), polytetrafluoroethylene (PTFE), polystyrene (PS), polymethylmethacrylate (PMMA) Ethylene-tetratluoro-ethylene (ETFE), tetrafluoroethylene/ hexafluoropropylene (THV), polyethylene (PE), polypropylene (PP) Epoxy resin (EP), polyester resin (UP), phenol resin (PF), resorcin resin (RF), polyurethane (PUR) Styrene-butadiene-rubber (SBR), polybutadiene-rubber (BR), ethylene-propylene-diene-rubber (EPDM)... 

Blending methyl methacrylate-butadiene-styrene copolymer with poly(vinyl chloride) for instance was shown to decelerate the dehydrochlorination (leading to discoloration). The gel content, surface energy, and the spectroscopic characteristics of the blend was altered by the presence of the seccHid polymer [158]. In ethylene-propylene-diene rubber EPDM where the third monomer is ethylene-2-norbomene (NB), the photo-oxidation rate as measured by the accumulation of typical products such as hydroperoxides, varied linearly with the NB content [159]. The same held true for peroxide-crosslinked compounds of the same EPDM except that the linear relationship was found between the relative carbonyl absorbance on photoxidation and the amoiuit of peroxide used to crosslink the material... 

Most of the earlier efforts have been paid in changing the surface character of clay minerals. Albeit the modified clay minerals are fairly compatible with the polar rubber like acrylonitrile butadiene rubber (NBR), carboxylated nitrile rubber (XNBR), chloroprene rubber (CR), etc., its dispersion in nonpolar rubbers like NR, styrene butadiene rubber (SBR), ethylene propylene diene rubber (EPDM), butadiene rubber (BR), etc. is rather unsatisfactory. Figure 8.3(a) and (b) display the state of dispersion of organomodified... 

Unlike natural rubber, filled synthetic rubber compounds (e.g., styrene butadiene rubber (SBR), ethylene propylene diene rubber (EPDM)) exhibit inherent low tack. The tack property is very important for tyre applications where multiple layers must adhere to each other. The lack of adequate tack may lead to failure of the final product. Long-chain and branched alkyl phenol-based novolac resins have been recommended as tackifier. 

Polyolefin blends are of critical importance to the success of the material. Ethylene propylene diene rubber (EPDM) immiscibly blends with PP as an impact modifier. It is the most common and most commercially utilised blend of polyolefins. High-density polyethylene (HOPE) can be added to this blend to achieve maximum toughness [11-13]. Applications include wire and cable insulation, automotive... 

In these studies, an advantage of in sim forming of chemically distinguished interphase was explored. Elastomers such as ethylene-propylene rubber (EPR) and ethylene-propylene-diene rubber (EPDM) were chemically modified to introduce polar groups onto their backbone chains. Most frequently, maleic anhydride and acrylic acid were used as the grafting comonomers (11-13). In... 

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