Ethylene-propylene diene rubber properties

ELASTOPffiRS,SYNTHETic-POLYcm.OROPRENE Elastop rs, SYNTHETIC-ETHYLENE-PROPYLENE-DIENE RUBBER). Tires, hoses, belts, molded and extmded goods, and asphalt products consume ca 80% of the reclaimed mbber manufactured. Typical properties of reclaimed mbbers are shown in Table 5. 

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

Ethylene-propylene polymer vulcanizates, properties of, 10 715-716 Ethylene-propylene (diene) rubber, 9 559-560... 

Li, W., Huang, Y. D., and Ahmadi, S. J., Preparation and properties of ethylene-propylene-diene rubber/organo-montmorillonite nanocomposites, J. Appl. Polym. ScL, 94, 440-445 (2004). 

Polyolefin Plastomers Polyolefin Plastomers are elas-tomerie polymers made of polypropylene and ethylene-propylene diene rubber. In general, a plastomer provides an exeellent combination of mechanical, thermal, and chemical properties expected of conventional thermoset rubber. 

Stmctural aspects of components constituting low-density polyethylene/ ethylene-propylene-diene rubber (LDPE/EPDM) blends are studied in bulk and compared to the surface layer of materials. Solvation of a crystalline phase of LDPE by EPDM takes place. The effect is more significant for systems of amorphous matrix, despite a considerable part of crystalline phase in systems of sequenced EPDM matrix seems to be of less perfect organization. Structural data correlate perfectly with mechanical properties of the blends. Addition of LDPE to EPDM strengthens the material. The effect is higher for sequenced EPDM blended with LDPE of linear structure. 

Polyolefine blends are group of versatile materials, which properties can be tailored to specific applications already at the stage of compounding and further processing. Our previous papers on elastomer/plastomer blends were devoted to phenomenon of co crystallization in isotactic poly-propylene/ethylene-propylene-diene rubber (iPP/EPDM) [1] or surface segregation in low-density polyethylene/ethylene-propylene-diene rubber (LDPE/EPDM) [2, 3] systems. Composition and structure of the materials were related to their properties. Recently, we have described the influence... 

Zhang, L., Wan, C., and Zhang, Y. (2009) Investigation on morphology and mechanical properties of polyamide 6/ maleated ethylene-propylene-diene rubber/organoclay composites. Pdlym. Eng. Sd., 49, 209. 

Zheng, H., Zhang, Y., Peng, Z., Zhang, Y.J. Inlluence of the clay modification and compatibilizer on the structure and mechanical properties of ethylene-propylene-diene rubber/montmorillonite composites. J. Appl. Polym. Sci. 92, 638-646 (2004)... 

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. 

This section studies the effect of the structure and composition of carbon nanofibers obtained by co-catalyst washed and not washed from the metal catalyst on the kinetics and properties of vulcanized ethylene propylene diene rubber. It is shown that the fibers obtained on the co-catalyst accelerate the crosslinking of EPDM, improve the physical and mechanical properties, increase the molecular mobility. The purpose of this research—investigation of the carbon nanofibers influence produced by co-catalysts on the physical and mechanical properties and structure of synthetic EPDM. 

The miscibility of natural rubber (NR) blends is one of the most important factors when designing NR products. For instance, when the NR is miscible with a dissimilar polymer on a molecular level, we may improve the properties of NR as a function of the composition of the polymer. This is significantly different from the design for immiscible NR blends, whose properties are greatly dependent upon the morphology of the blend but less so on the composition. In most cases, NR is immiscible with non-polar synthetic rubbers, i.e. NR/butadiene rubber (BR) with high c -1,4-butadiene units, NR/styrene-butadiene rubber (SBR), NR/butyl rubber (IIR), NR/silicone rubber (q)13,i4 NR/ethylene-propylene-diene rubber (EPDM). This means it is important to find miscible NR blends and to control the morphology of the immiscible NR blends in a rational way. In this chapter, properties of NR blends are described from the viewpoint of miscibility, i.e. the miscible blend of NR/BR and the immiscible blend of NR/SBR. 

NR is normally blended with ethylene-propylene-diene rubber (EPDM) to improve the ageing resistance of the former without losing its good mechanical properties. However, due to the difference in unsaturation level between these components, a mutual incompatibility can exist, which decreases the mechanical performance. In addition to the poor interfacial adhesion caused by the thermodynamic incompatibility, these blends usually present cure rate incompatibility because of the differences between the reactivity of the elastomers with the curing agents and/or differences in solubilities of the curatives in each phase. In the case of NR/EPDM blends, the curing system can be consumed by the vulcanization of the NR phase, which is more rapidly vulcanizable because of the higher unsaturation level. ... 

Ghosh and co-workers [6] in their study of the electrical properties of sulfonated maleated ethylene propylene diene rubber, demonstrated the occurrence of a characteristic frequency dependent on the high temperature peak (83-124 °C) which was ascribed to two different types of dielectric relaxations associated with multiplets... 

Ethylene-propylene and ethylene propylene-diene rubber compounds have poor building tack, so, when such a property is required (e.g., for assembling operations), the use of tackifers (cumarone resins, xylene formaldehyde resins, etc.) is indispensable. 

Ethylene propylene diene rubber is a well-known general-purpose rubber with a significant commercial importance. It has been one of the main mbbers to be investigated with organo-treated layered silicates to study the effects of nanoreinforcement on properties.EPDM nanocomposites with clays have been prepared by simple static mixing in confined chamber such as Haake, solution blending, and on a laboratory two roll mill. However, most EPDM/clay nanocomposites have been produced by conventional, internal melt blending process. " ... 

Compared to the vast literature on most of the thermoplastic or thermosetting polymer-clay nanocomposites, reports of rubber-clay nanocomposites are much more limited. Much more research is needed to understand the complex nature of these nanocomposites and to identify the factors that have the most significant influence on their physical, mechanical, thermal, barrier, and dynamic mechanical properties. The several examples of rubber-clay nanocomposite that have been covered in this chapter indicate that to date rubber nanocomposite research has largely concentrated on the natural rubber, ethylene propylene diene rubber, styrene-butadiene rubber, and nitrile rubbers. The main factors found to influence final properties were type of clay and its treatment, clay... 

TPEs from blends of rubber and plastics constitute an important category of TPEs. These can be prepared either by the melt mixing of plastics and rubbers in an internal mixer or by solvent casting from a suitable solvent. The commonly used plastics and rubbers include polypropylene (PP), polyethylene (PE), polystyrene (PS), nylon, ethylene propylene diene monomer rubber (EPDM), natural rubber (NR), butyl rubber, nitrile rubber, etc. TPEs from blends of rubbers and plastics have certain typical advantages over the other TPEs. In this case, the required properties can easily be achieved by the proper selection of rubbers and plastics and by the proper change in their ratios. The overall performance of the resultant TPEs can be improved by changing the phase structure and crystallinity of plastics and also by the proper incorporation of suitable fillers, crosslinkers, and interfacial agents. 

This is a nonpolar rubber with very little unsamration. Nanoclays as well as nanotubes have been used to prepare nanocomposites of ethylene-propylene-diene monomer (EPDM) rubber. The work mostly covers the preparation and characterization of these nanocomposites. Different processing conditions, morphology, and mechanical properties have been smdied [61-64]. Acharya et al. [61] have prepared and characterized the EPDM-based organo-nanoclay composites by X-ray diffracto-gram (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy... 

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. 

Mechanical Properties and Cure Rate Index of the Mixes—Role of Dry Bonding System on the Reinforcement of Ethylene-Propylene-Diene Monomer (EPDM) Rubber with Melamine Fiber ... 

Radiation Treatment NVP, 2-hydroxyethylmethacrylate (HEMA), and acrylamide (AAm) have been grafted to the surface of ethylene-propylene-diene monomer (EPDM) rubber vulcanizates using the radiation method (from a Co 7 source) to alter surface properties such as wettability and therefore biocompatibility [197]. Poncin-Epaillard et al. [198] have reported the modification of isotactic PP surface by EB and grafting of AA onto the activated polymer. Radiation-induced grafting of acrylamide onto PE is very important... 

The ductility of GRT-polyethylene blends drastically decreases at ground rubber concentration in excess of 5%. The inclusion of hnely ground nitrile rubber from waste printing rollers into polyvinyl chloride (PVC) caused an increase in the impact properties of the thermoplastic matrix [76]. Addition of rubber powder that is physically modihed by ultrasonic treatment leads to PP-waste ethylene-propylene-diene monomer (EPDM) powder blends with improved morphology and mechanical properties [77]. 

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