عنوان مقاله [English]
A series of ethylene-propylene-2-ethylidenebicyclo [2.2.1] hept.5-ene terpolymers (EPDM) have been prepared using a VOCl3/Al2Et3Cl3 catalyst under various Al/V ratios and diene concentrations via solution polymerization and characterized by FTIR, Mooney viscosity (ML1+4,125oC), and thermal gravimetery analyzing. The polymerization yield was seen to increase with augmentation of the Al/V ratio and diene concentration and pass through a maximum of about 200 gr polymer/g V. On the other hand, Mooney viscosity decreases with an increase in the two latter parameters. Increasing solvent to monomer ratio increased polymerization yield while it decreased Mooney viscosity. Accordingly, an optimum amount of solvent to monomer ratio (4:1 in mass) was found. One advantage of these polymer systems is that all the measured Tg property remained constant around 232-240 K in the range of incorporated ethylene and diene concentration. It has been observed that when Al/V ratio decreases and diene concentration increases, there is an increment in ethylene incorporation (40-60%), and the results have been compared with the characteristics of two commercial EPDMs (Herlen 563, Vistalon 7500).
 Hofman W., Rubber Technology Handbook, Hanser, Chapter 3, pp. 93-100, 1989.
 Karpeles R. & Grossi A.V., EPDM Rubber Technology, Handbook of Elastomers, 2nd Ed., Marcel Decker, Inc., 2001.
 A.Riedel J. & Vander laan R., Ethylene Propylene Rubber, The Vanderbilt Rubber Handbook, 13th Ed., R.T. Vanderbilt Co., Inc., 1990.
 Sobhanmanesh K., & Hajizadeh A., “Comparative studies on ethylene/propylene/diene terpolymerization”, Iranian Polymer Journal, Vol. 13, No. 4, pp. 257, 2004.
 Wakatsuki K. & saba H., “Present state and future of EPDM synthesis”, International Polymer Science and Technology, Vol. 21, No. 2, pp. 72-79, 1994.
 Haag M.C. & Dos Santos J.H.Z., “Residual metal content in ethylene-propylene-diene monomers synthesized using vanadium and zirconcene-based catalysts”, J. Appl. polym. Sci, Vol. 74, pp. 1997-2003, 1999.
 Cozewith C., Proceedings of the 73rd AIchE Meeting, Chicago, 1980.
 Cozewith C., Ver Strate G. & Ju S., “Near monodisperse ethylene-propylene copolymers by direct zigler-natta polymerization. polymerization. preparation, characterization, properties”, Macromolecules, Vol. 21, No. 12, pp. 3360–3371,1988.
 Strate G.V., “Encyclopedia of polymer science and engineering”, J. Wiley & Sons, Vol. 6 , pp. 522-525, 1986.
 Cozewith C. & Ver Strate G., “Ethylene-propylene copolymers. reactivity ratios, evaluation, and significance”, Macromolecules, Vol. 4, No. 4, pp. 482–489, 1971.
 Dolatkhani M., Cramail H. & Deffieux A., “Linear non-conjugated dienes from biomass as termonomers in EPDM synthesis, conventional versus metallocene catalysis”, Macromol. Chem. Phys., Vol. 197, pp. 2481-2491, 1996.
 Zohouri G.H., Vakili M., Jamjah R., Nekoomanesh & Ahmadjo S., “Study of variation in chemical composition of EPDM elastomers synthesized with ziegler-natta catalyst based on vanadium during terpolymerization”, Iranian Journal of Polymer Science & Tecnology (Persian Edition), Vol. 16, No. 5, pp. 327-332, 2004.
 Malmberg A. & Lofgren B., “The production of ethene/propene/5-ethylidene-2-norbornene terpolymer using metallocene catalysts: polymerization, characterization and properties of metallocene EPDM”, J.Appl. polym. Sci., Vol. 66, pp. 35-44, 1997.
 Haag M.C. & Dos Santos J.H.Z., “Synthetic and characterization of EPDM films”, J. Appl. Polym. Sci., Vol. 63, pp. 535-541, 1998.
 Haag M.C. & Dos Santos J.H.Z., “Dynamic simulation and experimental evaluation of EPDM terpolymerization with vanadium-based catalyst”, Vol. 70, pp. 1173-1189, 1998.
 Tanaglia T., Process for the production of ethylene-propylene elastomeric copolymers., U.S. Patent: 5804614, 1998.
 Gardner I.J., Cozewith C. & Ver strate G., “The shape of calibration curve in IR analysis of copolymer composition”, Rubber chem.Technol., Vol. 44, pp. 1051, 1971.