EVALUATING ETHYLENE PROPYLENE DIENE MONOMER RUBBER FOR DYNAMIC APPLICATIONS INSTEAD OF NATURAL RUBBER

Year 2019, , 121 - 132, 01.01.2019

Ayşe Tuğba Köktürk Bağdagül Karaağaç Haluk Konyalı

https://doi.org/10.18038/aubtda.410141

Abstract

Natural Rubber (NR) has been used in dynamic applications for many years. NR has satisfactory resilience, vibration, and fatigue properties. Besides all these good properties, NR has quite poor aging resistance; also its service temperature is limited to about 90 °C. Improving aging characteristics of NR is a common problem for both rubber industry and academy. Nowadays, especially automotive industry has been focused on thermally resistant static and dynamic rubber based materials in new generation automobiles because of current strict emission regulations. There are a lot of attempts to improve service conditions of NR however; they are not comparable yet, with alternative saturated rubbers such as EPDM. In this study, a new grade EPDM, which had a high molecular weight, narrow molecular weight distribution, and tailor-made chain structure, has been studied in terms of rheological, mechanical, dynamic mechanical, aging, and low temperature properties for target dynamic applications. Especially possible service temperature and dynamic performance of EPDM were compared to that of NR based reference. It was concluded that, EPDM may be an assertive competitor to NR, if its chain structure is modified correctly.

Keywords

Rubber, EPDM, Natural rubber, NR, Dynamic properties

References

• Harris CM, Piersol AG. Mechanical properties of rubber. In: Schafer C, editor. Shock and Vibration Handbook. New York, USA: McGraw Hill, 2002.
• Dick JS. How to Improve Rubber Compounds? 1st ed. Munich, Germany: Hanser, 2014.
• Sommer JG. Troubleshooting Rubber Problems. 1st ed. Munich, Germany: Hanser, 2013.
• Stratton A, Ferry D. Mechanical properties of natural rubber vulcanizates crosslinked by various agents. J Physic Chem 1963; 67: 2781-2785.
• Fan L, Zhang Y, Li F, Zhang X, Sun K, Fan Z. Effect of high temperature curing on the crosslink structures and dynamic properties of gum and N 330 – filled natural rubber vulcanizates. Polym Test 2001; 20: 925-936.
• Simma K, Rempel L, Prasassarakich P. Improving thermal and ozone stability of skim natural rubber by diimide reduction. Polym Degrad Stab 2009; 94: 1914-1923.
• Akinlabi K, Okieimen E, Aigbodion I. Thermal ageing properties and chemical resistance of blends of natural rubber and epoxidized low molecular weight natural rubber. J Appl Polym Sci 2001; 98: 1733-1739.
• Markovic G, Dutta K, Dimopoulos M, Choudhury R, Matisons JG. Viscoelastic behaviour of filled and unfilled EPDM elastomer. Thermochim Acta 1999; 357: 211-216.
• Mao X, Xu S, Wu C. Dynamical mechanical properties of EPDM rubber blends. Polym Plast Technol Eng 2008; 47: 209-214.
• Spanos P, Beelen J, Gögelein C, Duin M, Aar N. NR Replacement by ultra-high molecular weight EPDM in dynamic applications. In: 188th Technical Meeting of the Rubber Division ACS, 12-14 October 2015; Cleveland, USA.