Papers by Keyword: EPDM

Abstract: The most popular kind of anti-vibration mounting for compression is a rubber bushing, which has many components bearing the total weight of the movable part between them and the foundation structure. Ethylene Propylene Dine Monomer (EPDM) blending with natural rubber NR (SMR20) with several percentage ratio reinforced by two types of carbon black (CB) to hold flexible recipes for specific applications such as doors seals and roads humps were discussed here. EPDM/SMR20 with blending ratio (70/30) reinforced by CB N375 was the more flexible recipe with results 19 Mpa, 36 IRHD, 600% and 12% for tensile strength, hardness, elongation and compression set respectively. The behavior of EPDM chains that accept the very fine carbon black particles as a filler and reinforcement agent till 80 pphr loading and also that vulcanized by Sulphur played the major effect of this performance. For a numerical dynamic analysis with finite element model, used for forced vibration to evaluate the dynamic response of recipes. Through the results, it was observed that the dynamic response of recipe A is greater than the other recipes. The high value of the response gives the largest area under the curve and thus has the ability to absorb the largest amount of the applied load.

Abstract: This research examines the friction and wear characteristics, as well as the mechanical properties, of EPDM (ethylene propylene diene monomer) rubber filled with oleamide. The friction measurements are done in contact with PA66GF30. The goal is to determine the suitability of this material combination for usage in dynamic sealing applications on the cathodic side of PEMFC (Proton Exchange Membrane Fuel Cell) systems. The EPDM rubber, specifically designed for reduced friction, underwent aging procedures such as heat aging and water-glycol soaking to assess its long-term performance. The pin-on-disk tests demonstrated a rapid initial rise in the coefficient of friction (CoF) and notable wear, but the hot water extraction experiments showed inadequate chemical stability with substantial ion leaching. The tensile tests demonstrated a significant decrease in mechanical characteristics during the aging process. The findings indicate that the EPDM containing oleamide has promise for dynamic sealing. However, its performance is greatly affected by aging and exposure to the environment, which highlights the need for more material optimization.

Abstract: This work focus on the utilization of waste ethylene propylene diene rubber (EPDM) that undergo devulcanization process via microwave radiation and further were compounded with virgin EPDM as rubber blend with the various loadings of zinc dimethyl acrylate (ZDMA). The properties of the re-vulcanized rubber blends were studied. The addition of ZDMA into the rubber blends reduce 50% of its cure time with improved in tensile strength by ~76%. Their crosslink density were determined using swelling test and the network effected with crosslink density were identify by Fourier-transform Infrared Spectroscopy (FTIR). From swelling test, the re-vulcanized EPDM rubber blends showed an increment in crosslink density with the addition of ZDMA. FTIR spectrum revealed that ZDMA interact at molecular level as the intensity of the absorption peaks change. Devulcanized EPDM shows its potential to be used with virgin materials as a rubber blend with improved properties. Furthermore, the addition of ZDMA in peroxide vulcanization system of EPDM rubber blend can be utilized as an alternative mixing ingredients to improve the vulcanized EPDM properties.

Abstract: One type of technical rubber that is currently imported is a pneumatic fender, which mostly only uses synthetic rubber as raw material. Whereas natural rubber has superior mechanical properties that are better than synthetic rubber. This research will combine natural rubber (RSS) with EPDM synthetic rubber by varying the RSS/EPDM mass ratio. This study aims to determine the effect of the mass ratio of RSS/EPDM on the quality of the mechanical properties of pneumatic fender compounds. The rubber compound is made with a ratio of RSS/EPDM: 100/0, 90/10, 80/20, 70/30, and 0/100. The mechanical testing was carried out under normal and aging conditions. The test results showed that the mass ratio of RSS/EPDM rubber affected the mechanical properties of the resulting rubber compound. The rubber compound formula containing EPDM 10 to 30 phr is suitable for pneumatic fender applications due to better properties and resistance after aging, particularly compression set.

Abstract: In this study, the effect of SBR concentration (10 Phr, 20 Phr & 30 Phr ) on the thermal behavior of EPDM/SBR blends was studied. Thermogravimetric analysis (TGA) was used to check weight loss of samples as function of temperature by heating upto 600^°C. X-ray diffraction (XRD) was performed to determine quality and % crystallinity of the elastomer blends. It was seen that % crystallinity improved with an increase in the content of SBR in EPDM/SBR blends. TGA revealed that the thermal stability of EPDM/SBR blends has improved by 17% than neat EPDM. Carbon nano-coatings produced by sputtering have no beneficial influence on thermal behaviour of elastomers.

Abstract: The rubber compounds based on BR and on mixtures BR with EPDM containing experimental organoclay samples based on bentonites from the “Sarinskoye” deposit (Orenburg Region, Russia), additives to polymers Cloisite® 10A manufactured by Southern Clay Prod. () were compared. The increase of tensile strength at break by introduction of organoclay in rubber compounds based on BR and on mixtures BR with EPDM was determined. The compatibility of rubbers with the introduction of organoclay in the mixture BR with EPDM was improved

Abstract: The Polyamide 6 (PA6)/ maleic anhydride grafted ethylene-propylene-diene monomer (EPDM-g-MAH)/organic montmorillonite (OMMT) nanocomposites were successfully prepared by melt extrusion method at different contents of OMMT fillers. The content of OMMT were studied to discuss the mechanical properties, thermal resistance properties and melt-crystal behavior of the nanocomposites. The results were summarized as follows: The PA6/EPDM-g-MAH/OMMT nanocomposites were prepared using melt extrusion method. The influence of the OMMT filler contents on the properties of PA6/EPDM-g-MAH/OMMT nanocomposites were studied. The mechanical properties and thermal resistance properties were improved with the addition of OMMT. The results showed that when the content of OMMT was 3.5wt%, comparing to the pure PA6, the bending strength was improved 31.7%, the notch impact strength was improved by 40.5%, and the heat deflection temperature was improved by 31.1°C. This kind of nanocomposites had good application prospects.

Abstract: ZnO nanograins (nZnO) were synthesized by a precipitation method. The nZnO exhibited the average grain size of ~30 nm and the specific surface area of 28.24 m² g^-1. Then, it was incorporated into the ethylene propylene diene monomer (EPDM) rubber and produced to be a rubber stopper. This work studied the effect of nZnO and conventional ZnO (cZnO) as a cure activator on the thermal conductivity and mechanical properties of the rubber stopper. As the content of nZnO increased, the thermal conductivity and mechanical properties are also increased. The obtained results could be reduced successfully from 5 to 2 parts per hundred parts of rubber (phr) compared with a cZnO because nZnO provides a satisfactory thermal conductivity and mechanical properties. Moreover, it also gives uniform completely vulcanized for thick rubber product due to swelling value (Q) between outer and inner portion of rubber stopper is less difference. In this work is concluded that the dosage, grain sizes and grain boundary of ZnO are effective parameter in the thermal conductivity and mechanical properties of the rubber stopper.

Abstract: Non-curing sealants have a complex composition consisting of a mixture of polymers, plasticizers, extenders, adhesive additives, various special purpose additives (pigments, biocides, fire-retardants), and therefore the optimization of their compositions to improve the physical and mechanical and technological characteristics is rather complicated. This article demonstrates the experimental results of physical and mechanical properties such as penetration, strength, density, adhesion to metal and concrete, water absorption, and elongation of sealants on the basis of butyl-rubber and EPDM, depending on filler type and volume. The basic regularities of the nature influence and fillers on the physical and mechanical and technological characteristics of sealants are revealed. We’ve identified the ultimate proportion of fillers when the sealants meet the required specifications. The research results are the recommendations on the selection and optimization of the filler content of the sealant composition.

Abstract: The novel geometry of a gasket’s cross-section to optimize the sealing performance was proposed in spite of corrosion of its counterparts or tilted assembly. EPDM was applied for the rubber material and the sealing performance including stress, strain and contact pressure was estimated by finite element analysis (FEA) in both cased of normal and tilted assemblies. If the gaskets were to be normally assembled in the grooves, both gaskets (single-point contact and double-point contact) could be utilized for sealing systems. Even at the tilted assembly, the double-point contact gasket showed two discrete contact pressure areas; thus it could maintain its sealing performance over time at various operating conditions, compared to the single-point gasket.