International Science Index


Electron Beam Processing of Ethylene-Propylene-Terpolymer-Based Rubber Mixtures


The goal of the paper is to present the results regarding the influence of the irradiation dose and amount of multifunctional monomer trimethylol-propane trimethacrylate (TMPT) on ethylene-propylene-diene terpolymer rubber (EPDM) mixtures irradiated in electron beam. Blends, molded on an electrically heated laboratory roller mill and compressed in an electrically heated hydraulic press, were irradiated using the ALID 7 of 5.5 MeV linear accelerator in the dose range of 22.6 kGy to 56.5 kGy in atmospheric conditions and at room temperature of 25 °C. The share of cross-linking and degradation reactions was evaluated by means of sol-gel analysis, cross-linking density measurements, FTIR studies and Charlesby-Pinner parameter (p0/q0) calculations. The blends containing different concentrations of TMPT (3 phr and 9 phr) and irradiated with doses in the mentioned range have present the increasing of gel content and cross-linking density. Modified and new bands in FTIR spectra have appeared, because of both cross-linking and chain scission reactions.

[1] Mondelaers W., “Low-energy electron accelerators in industry and applied research”, Nuclear Instrument and Methods in Physics Research B, 1998, 139(1-4), 43-50
[2] Berejka, A. J., and Cleland, M. R. “Industrial Radiation Processing With Electron Beams and X-rays”, IAEA International Atomic Energy Agency, 1 May 2011 – Revision 6
[3] Mehnert R., “Review of industrial applications of electron accelerators”, Nuclear Instrument and Methods in Physics Research B, 1996, 113, 81-87
[4] E Manaila, M D Stelescu, G Craciun, Chapter 1" Aspects Regarding Radiation Crosslinking of Elastomers", Advanced Elastomers – Technology, Properties and Applications, 2012, Ed. In Tech., Rijeka, Croatia, p. 3-34
[5] Long Cheng, David R. Kerluke, Radiation for Modification of Polimers, The 2003 Annual Technical Conference of Society Engineering (ANTEC), 2003;
[6] Milinchuk V.K., Klinshpont E.R., Tupikov V.I., Radiation Stability of Polymer. New Chain Reactions, Intern. Journal Polymeric Mater., 23(3-4), 197 – 206, 1994;
[7] Milinchuk V.K., Klinshpont E.R., Khimiya vysokikh energij, 25, 483 – 492, 1991;
[8] K Rajkumar, Chandresh Dwivedi, P Thavamani, P. Jeyanthi, P. Pazhanisamy, Effect Of Nanosilica On Ethylene Propylene Diene Monomer Rubber Nanocomposites, International Journal of Innovative Research & Development, Vol 2 Issue 5, May, 2013, pp. 831-841,
[9] M. Homocianu, A. Airinei, D. M. Stelescu, D.Timpu, A. Ioanid, Morphological Structure and Surface Properties of Maleated Ethylene Propylene Diene Monomer/Organoclay Nanocomposites, POLYMER COMPOSITES—-2012, DOI 10.1002/pc.22159, Vol 33, issue 3, march 2012, p.379-387
[10] M. D. Stelescu, E. Manaila, G. Craciun, Vulcanization of ethylene-propylene–terpolymer-based rubber mixtures by radiation processing, Journal of Applied Polymer Science, Article first published online: 11 JUL 2012, DOI: 10.1002/app.38231, vol. 128, pp. 2325-2336
[11] Datta S.K., Pradhan N.K., Chaki T.K., Aging and Chemical Resistance of Crosslinked Ethylene Vinyl Acetate Copolymer, Kautschuk Gummi Kunststoffe, 7-8, 554-559, 1997;
[12] M.D. Stelescu, E. Manaila, D. Martin, G. Craciun, D. Ighigeanu, L. Alexandrescu, New Technologies of grafting and crosslinking rubber blends by electron beam and microwave irradiation, Performantica Publishing House, Iasi, 2011.
[13] P.J. Flory, J. Rehner, Statistical mechanics of crosslinked polymer networks II. Swelling, J. Chem. Phys. 11 (1943) 521-526.
[14] P. Anelli, S. Baccaro, M. Carenza, G. Palma, Radiation grafting of hydrophilic monomer onto ethylenepropylene rubber, Rad. Phys. Chem. 46 (1995) 1031-1035.
[15] A. Charlesby, Gel formation and molecular weight distribution in long-chain polymers, Proc. Royal Soc. London, A222 (1954) 542-557.
[16] A. Charlesby, S.H. Pinner, Analysis of the solubility behaviour of irradiated polyethylene and other polymers, Proc. Royal Soc. London, 249A (1959) 367-386.
[17] Charlesby A.: Atomic radiation and polymers. Pergamon Press, New York (1960).
[18] Banik I., Bhowmick A.K. Effect of Electron Beam Irradiation on the properties of cross-linked rubbers. Radiation Physics and Chemistry. 2000; 58:293-298.
[19] Bhattacharya A. Radiation and Industrial Polymers. Progress in Polymer Science. 2000; 25:371-401.
[20] Bhowmick A. K., Vijayabaskar V. Electron beam curing of elastomers. Rubber Chemistry and Technology. 2006; 79(3):402-428.
[21] Stelescu M.D., Manaila E., Craciun G., Zuga N. Crosslinking and grafting ethylene vinyl acetate copolymer with accelerated electrons in the presence of polyfunctional monomers, Polymer Bulletin. 2012; 68(1):263-285.
[22] Zaharescu T., Setnescu R., Jipa S., Setnescu T. Radiation processing of polyolefin blends. I. Crosslinking of EPDM–PP blends. Journal of Applied Polymer Science. 2000; 77(5):982-987.
[23] Chowdhury R., Banerji M.S. Electron beam irradiation of ethylene-propylene terpolymer: Evaluation of trimethylol propane trimethacrylate as a crosslink promoter. Journal of Applied Polymer Science. 2005; 97(3):968–975.