Comparative study on mechanical,thermal,viscoelastic and rheological properties of vulcanised EPDM rubber

Abstract

In this study, mechanical, thermal and rheological properties of vulcanised ethylene propylene diene monomer (EPDM) rubber containing different amounts of vulcanising agent, filler, paraffinic oil and stearic acid were compared. Moreover, reaction rate constant of the curing reaction has been calculated from the results of the rheological tests, and relative change of rate constant with the change of additives was studied by a new method. Thermal gravimetric analysis with in situ Fourier transform infrared (FTIR) spectra was taken, and the thermal degradation of the EPDM rubber was observed for varying amounts of vulcanising agent and filler content. Although the vulcanising agent improved the mechanical properties of the EPDM initially, a further increase in the vulcanising agents deteriorated the mechanical properties. Attenuated total reflectance FTIR spectrum confirmed the decrease in the relative degree of cross-linking with the increase in the vulcanising agent content to 10 h⁻¹. Moreover, attenuated total reflectance FTIR spectra reaffirmed that cross-linking density increases with carbon black content. In situ FTIR spectra showed that the thermo-oxidative stability increased with the increase in filler content.

Keywords

EPDM PEROXIDE MECHANICAL RHEOLOGY COAGENT VULCANISATION ADDITIVE

Get full access to this article

View all access options for this article.

References

Ghosh

and Chakrabarti

: Eur. Polym. 1, 2000, 36, 1043-1054.

. Guriya, A. K. Bhattachariya and D. K. Tripathy: Polymer, 1998, 39, 109–115.

Prut

, Medintseva

and Dreval

: Macromoi Sy ., 2006, 233, 78–85.

Osanaiye

G. J.

: J. Appl. Polym. Set , 1996, 59, 567–575.

Huang

, Yang

, Liu

and Zhang

: Eur. Polym. J ., 2002, 38, 857–861.

Ghosh

and Chakrabarti

: Eur. Polym. 1, 2000, 36, 607–617.

Mahapatra

S. P.

and Tripathy

D. K.

: J. Appl. Polym. Set , 2006, 102, 1600–1608.

Abd-El Salam

, Abd-El Salam

M. H.

, Mostafa

M. T.

, Nagy

M. R.

and Mohamed

M. I.

: J. Appl. Polym. ScL , 2003, 90, 1539–1544.

cavdar

, Ozdemir

and Usanmaz

: ‘Mechanical, vulcametric, and thermal properties of the different 5-ethylidene 2-norbornene content of ethylene-propylene-diene-monomer vulcanized with different types and compositions of peroxides’, J. Appl. Polym. Set , 2009, 112, 1891–1896.

10.

Ozdemir

: ‘Gamma irradiation degradation/modification of 5-ethylidene 2-norbornene (ENB)-based ethylene propylene diene rubber (EPDM) depending on ENB content of EPDM and type/ content of peroxides used in vulcanization’, Radiat. Phys. Chem ., 2008, 77, 787–793.

11.

Rosca

I. D.

and Vergnaud

J. M.

: Polymer , 2002, 43, 195–202.

12.

‘Testing of rubber; determination of tensile strength at break, tensile stress at yield, elongation at break and stress values in a tensile test’, DIN 53504, German Institute for Standardization, Berlin, Germany, 1994.

13.

‘Standard test methods for vulcanized rubber and thermoplastic elastomers — tension’, D 412, ASTM International, West Conshohocken, PA, USA, 2006.

14.

‘Standard test methods for rubber properties in compression’, D 575-91, ASTM International, West Conshohocken, PA, USA, 2007.

15.

‘Standard test method for rubber property — durometer hardness’, D 2240-05, ASTM International, West Conshohocken, PA, USA, 2005.

16.

Dick

J. S.

: ‘Rubber technology: compounding and testing for performance’; 2001, Cincinnati, OH, Hanser Gardner Publications.