AMPC  Vol.5 No.9 , September 2015
Structure-Property Relationship in Terms of Dynamic Mechanical Properties of High Energy Radiation Treated Industrially Important Thermoplastic Elastomer Blend
A series of low-density polyethylene (LDPE)/ethylene propylene diene terpolymer (EPDM) blends with various compositions have been prepared by melt mixing followed by injection molding. These specimens are irradiated at 40, 80, 120 and 160 kGy electron beam radiation. The gel content increases with increase in EPDM and as well as EB dose. Storage modulus (E’) and loss modulus (E”) are decreased with increase in EPDM content. Storage modulus continues to increase and loss modulus keeps on decreasing with radiation dose. Interestingly, damping property is found to be more for EPDM rich blends, which again decreases upon irradiation. Morphology of fractured surface of LDPE/EPDM shows that with increase in EPDM content, the size and depth of the cavity becomes larger and deeper indicating higher ductility. But, EB crosslinking makes the surface smoother and the smoothness keeps on increasing with increase in dose rendering stiffness to the samples.

Cite this paper
Sharma, B. , Chowdhury, S. , Mahanwar, P. and Sarma, K. (2015) Structure-Property Relationship in Terms of Dynamic Mechanical Properties of High Energy Radiation Treated Industrially Important Thermoplastic Elastomer Blend. Advances in Materials Physics and Chemistry, 5, 383-398. doi: 10.4236/ampc.2015.59039.
[1]   Brydson, J.A. (1996) Plastics Materials. 6th Edition, Butterworth-Heinemann, Oxford.

[2]   Freakley, P.K. (1985) Rubber Processing and Production. Plenum Press, New York.

[3]   Sen-Majumder, P. and Bhowmick, A.K. (2000) Structure-Property Relationship of Electron-Beam-Modified EPDM Rubber. Journal of Applied Polymer Science, 77, 323-337.<323::AID-APP8>3.0.CO;2-V

[4]   Singh, A. (2001) Irradiation of Polymer Blends Containing a Polyolefin. Radiation Physics and Chemistry, 60, 453-459.

[5]   Airinei, A. (2013) Structural Characteristics of Some High Density Polyethylene/EPDM Blends. Polymer Testing, 32, 187-196.

[6]   Ehsani, M., Zeynali, M.E., Abtahi, M. and Harati, A.A. (2009) LDPE/EPDM blends as Electrical Insulators with Unique Surface, Electrical and Mechanical Properties. Iranian Polymer Journal, 18, 37-47.

[7]   Senna, M.M., Youssef, H.A. and Eyssa, H.M. (2007) Effect of Electron Beam Irradiation, EPDM and Azodicarbonamide on the Foam Properties of LDPE Sheet. Polymer-Plastics Technology and Engineering, 46, 1093-1101.

[8]   Sadek, E.M., El-Nashar, D.E. and Motawie, A.M. (2003) Modification of Ethylene Propylene Diene Terpolymer Rubber by Some Thermoplastic Polymers. Polymer-Plastics Technology and Engineering, 42, 627-642.

[9]   Kim, D.H. and Kim, S.C. (1989) Effects of Curing Conditions on the Properties of the Dynamically Cured EPDM/ HDPE Blends. Polymer Bulletin, 21, 401-408.

[10]   Nouri, M. and Mehrabzadeh, M. (1996) Studies on Rheological Behaviour of LDPE/EPDM Blends Using a Torque Rheometer. Iranian Polymer Journal, 5, 237-241.

[11]   Choudhury, A. and Adhikari, B. (2007) Dynamic Vulcanization of Recycled Milk Pouches (LDPE-LLDPE) and EPDM Blends Using Dicumyl Peroxide. Polymer International, 56, 1213-1223.

[12]   Abdel-Aziz, M.M., Abdel-Bary, E.M., Abou Zaid, M.M. and El Miligy, A.A. (1992) Effect of Gamma Radiation on EPDM/LDPE Blends. Journal of Elastomers and Plastics, 24, 178-191.

[13]   Nouri, M. and Mehrabzadeh, M. (1996) Studies on Rheological Behavior of LDPE/EPDM Blends Using a Torque Rheometer. Iranian Polymer Journal, 5, 237-241.

[14]   Jamal, N.A., Anuar, H. and Raza, S.B.A. (2011) Modification of Tensile and Impact Properties of Crosslinked Rubber Toughened Nanocomposites via Electron Beam Irradiation. Canadian Journal on Scientific & Industrial Research, 2, 133-142.

[15]   Shin, B.-S., Seo, D.-K., Kim, H.-B., Jeun, J.-P. and Kang, P.-H. (2012) A Study of the Thermal and Mechanical Properties of Electron Beam Irradiated HDPE/EPDM Blends in the Presence of Triallyl Cyanurate. Journal of Industrial and Engineering Chemistry, 18, 526-531.

[16]   Avitzur, B. (1997) Electron Beam Crosslink Irradiation of Wire and Cable Insulation, Technical Report. Proceedings of the 47th Annual Convention of the Wire Association International, Boston, 17 October 1997.

[17]   Naskar, K., Gohs, U., Heinrich, G. and Wagenknecht, U. (2009) PP-EPDM Thermoplastic Vulcanisates (TPVs) by Electron Induced Reactive Processing. Express Polymer Letters, 3, 677-683.

[18]   Clegg, D.W. and Collyer, A.A. (1991) Hand Book of Irradiation Effects on Polymers. Elsevier, New York.

[19]   McGinnis, V.D. (1986) Encyclopedia of Polymer Science and Technology. John Wiley & Sons, New York, 445.

[20]   Chowdhury, S.R., Sabharwal, S. and Sarma, K. (2012) Development of Recyclable Electron Beam Radiation Crosslinked LDPE/EVA-Embedded Nanoclay Nano-composites. Journal of Reinforced Plastics and Composites, 31, 1426-1434.

[21]   Charlesby, A. (1954) Gel Formation and Molecular Weight Distribution in Long Chain Polymers. Proceedings of the Royal Society A, 222, 542-557.

[22]   Charlesby, A. and Pinner, S.H. (1959) Analysis of the Solubility of Irradiated Polyethylene and Other Polymers. Proceedings of the Royal Society A, 249, 367-386.

[23]   Dikland, H.G. and Van Duin, M. (2002) Crosslinking of EPDM Studied with Optical Spectroscopy. In: Litvinov, V.M. and De, P.P., Eds., Spectroscopy of Rubber and Rubbery Materials, Rapra Tech Ltd., Shawbury, 656.

[24]   Chowdhury, R. and Banerji, M.S. (2005) Electron Beam Irradiation of Ethylene-Propylene Terpolymer: Evaluation of Trimethylol Propane Trimethacrylate as a Crosslink Promoter. Journal of Applied Polymer Science, 97, 968-975.

[25]   Zaharescu, T., Feraru, E., Podina, C. and Jipa, S. (2005) High Energy Radiation Processing of EPDM in a Hydrocarbon Environment. Part 1. Methylcyclopentane. Polymer Degradation and Stability, 89, 373-381.

[26]   Chowdhury, S.R. (2008) Some Important Aspects in Designing High Molecular Weight Poly(L-lactic acid)-Clay Nanocomposites with Desired Properties. Polymer International, 57, 1326-1332.

[27]   Giri, R., Naskar, K. and Nando, G.B. (2012) Effect of Electron Beam Irradiation on Dynamic Mechanical, Thermal and Morphological Properties of LLDPE and PDMS Rubber Blends. Radiation Physics and Chemistry, 81, 1930-1942.

[28]   Nielsen, L.E. (1962) Mechanical Properties of Polymers. Reinhold Publishing Corp, New York, 150.

[29]   Takayanagi, M., Uemura, S. and Minami, S. (1964) Application of Equivalent Model Method to Dynamic Rheo-Optical Properties of Crystalline Polymer. Journal of Polymer Science Part C: Polymer Symposia, 5, 113-122.

[30]   Oakes, W.G. and Rabinson, D.W. (1954) Dynamic Electrical and Mechanical Properties of Polythene over a Wide Temperature Range. Journal of Polymer Science, 14, 505-507.

[31]   Ray, I. and Khastigir, D. (1993) Correlation between Morphology with Dynamic Mechanical, Thermal, Physicomechanical Properties and Electrical Conductivity for EVA-LDPE Blends. Polymer, 34, 2030-2037.

[32]   Koleske, J.V. and Lundberg, R.D. (1969) Lactone Polymers. I. Glass Transition Temperature of Poly-ε-Caprolactone by Means on Compatible Polymer Mixtures. Journal of Polymer Science Part A-2, 7, 795-807.

[33]   Hickman, J.J. and Ikeda, R.M. (1973) Studies of Polymer Blends I. Compatibility of Poly(vinyl chloride) and Poly(ethylene-co-vinyl acetate-co-sulfur dioxide). Journal of Polymer Science Part A-2, 11, 1713-1721.

[34]   Bhattacharyya, A.R., Ghosh, A.K. and Misra, A. (2001) Reactively Compatibilised Polymer Blends: A Case Study on PA6/EVA Blend System. Polymer, 42, 9143-9154.

[35]   Okada, O., Keskkula, H. and Paul, D.R. (2000) Fracture Toughness of Nylon 6 Blends with Maleated Ethylene/Propylene Rubbers. Polymer, 41, 8061-8074.

[36]   Mukhopadhyay, P. and Das, C.D. (1990) Effect of E/P Ratio on the Rheology and Morphology of Crosslinkable Polyethylene and EPDM Blends. Journal of Applied Polymer Science, 39, 49-62.

[37]   Senna, M.M.H., Abdel-Moneam, Y.K., Hussein, Y.A. and Alarifi, A. (2012) Effects of Electron Beam Irradiation on the Structure-Property Behavior of Blends Based on Low-Density Polyethylene and Styrene-Ethylene-Butylene-Styrene- Block Copolymers. Journal of Applied Polymer Science, 125, 2384-2393.

[38]   Sengupta, R., Sabharwal, S., Tikku, V.K., Somani, A.K., Chaki, T.K. and Bhowmick, A.K. (2006) Effect of Ambient-Temperature and High-Temperature Electron-Beam Radiation on the Structural, Thermal, Mechanical, and Dynamic Mechanical Properties of Injection-Molded Polyamide-6,6. Journal of Applied Polymer Science, 99, 1633-1644.