Ethylene-propylene-diene methylene

Chemical pretreatments with amines, silanes, or addition of dispersants improve physical disaggregation of CNTs and help in better dispersion of the same in rubber matrices. Natural rubber (NR), ethylene-propylene-diene-methylene rubber, butyl rubber, EVA, etc. have been used as the rubber matrices so far. The resultant nanocomposites exhibit superiority in mechanical, thermal, flame retardancy, and processibility. George et al. [26] studied the effect of functionalized and unfunctionalized MWNT on various properties of high vinyl acetate (50 wt%) containing EVA-MWNT composites. Figure 4.5 displays the TEM image of functionalized nanombe-reinforced EVA nanocomposite. 

Ethylene-propylene-diene-methylene rubber (EPDM) 0.86... 

EPDM ethylene propylene diene methylene linkage... 

On the other hand, Xiubin et al. reported the preparation of ethylene propylene diene methylene rubber composites filled with pretreated multi-walled carbon... 

Xiubin, Z., Haiyan, Z., Jin, L., Liping, L., Qiguang, W. Thermal conductivity and thermal stability enhancement of ethylene propylene diene methylene with carbon nanotube. J. Reinf. Plast. Compos. 33, 767-774 (2014)... 

Other elastomers which have been used to modify polyesters include EPDM (ethylene-propylene-diene-methylene), poly(epichlorohydrin) with hydroxyl end groups (Crosbie and Phillips, 1985b Ullett and Chartoff, 1995), organic siloxane elastomers, polyacrylates (Ullett and Chartoff, 1995), and polyurethane elastomers (IQm and Chan-Park, 1994). 

Many researchers have studied the effects of y-irradiation on the mechanical and thermal properties of polymer-clay nanocomposites.In this case, the polymer-clay nanocomposites were prepared by the conventional method, not the y-irradiation method. Ahmadi et al studied the effects of y-irradiation on the properties of ethylene-propylene diene methylene-linked rubber... 

An EPDM rubber is produced by the terpolymerisation of ethylene and propylene with a small amount (typically of the order of 5%) of an unconjugated di-olefin. The di-olefins used, include dicyclopentadiene, 1,4-hexadiene, 5-methylene-2-norbornene, 5-ethylidene-2-norbornene and methyl tetrahydroindene, 1,5 cyclo octadiene. A number of other dienes [74,75] have been tried. Infrared spectroscopy [35] is used to find out the ter monomer content. The characteristic peaks for the ter monomer are shown in Table 3.4. In view of the relatively low concentrations, it is probable that ter monomer base units are present largely as isolated units in EPDM but the distribution of propylene and methylene sequences is of considerable interest. 

While the third monomer can be a conunon diene, like isoprene, more often it is a bridged ring structure with at least one double bond in the ring. In typical terpolymer rubbers with 60 to 40 ratios of ethylene to propylene, the diene components usually comprise about 3% of the total. Some specialty rubbers, however, may contain 10% of the diene or even more. Reaction conditions are always chosen to obtain 1,2 placement of the diene. Dienes in common use are ethylidine norbomene, methylene norbomene, 1,4-hexadiene, dicyclopentadiene, and cycloocadiene ... 

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