Effect of electron donor on PE polymerization


  • Awiruth Thongdonjui Faculty of Science, Chulalongkorn University
  • Wimonrat Trakarnpruk Faculty of Science and Center of Excellence for Petroleum, Petrochemicals, and Advanced Materials, Chulalongkorn University
  • Roman Helmuth Strauss Research and Development Department IRPC Public Company Limited


Ziegler –Natta catalyst, HDPE, Magnesium chloride


Ziegler-Natta catalyst was prepared from colloidal MgCl2 (from reaction between magnesium ethyl carbonate and aluminium sesquichloride, Al2Et3Cl3) followed by contact with TiCl4. Al/Mg and Ti/Mg molar ratios were studied as parameters affecting the catalyst synthesis. Catalytic performance and effect of electron donor on ethylene polymerization were investigated. Results showed that addition of electron donor (ethyl benzoate) increased activity balance when polymerizations were performed under hydrogen pressure of 1 bar and 3 bars. The morphology of the polymer can be improved while fine content of the polymer was reduced by addition of dicyclopentyl dimethoxysilane. A productivity of 17.3 and 15.0 kg PE/g cat. was obtained at 1 and 3 bar H2. High density polyethylenes with molecular weight of 2.43x105 g/mol, molecular weight distribution of 11.9 and high bulk density (0.36 g/cm3) can be obtained.


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Boor, J. 1979. Ziegler-natta catalysts and polymerization. New York : Academic Press.

Forte, M.C. and Coutinho, F.M.B. 1996. Highly active magnesium chloride supported zieglernatta catalysts with controlled morphology. Eur. Polym. J. 32: 223-231.

Di Drusco, G. and Rinaldi, R. 1984. Hydrocarbon Process. 11 : 113.

Covezzi, M. 1995. The spherilene process: linear polyethylenes. Macromol. Symp. 89 : 577- 580.

Giannini, U. 1981. Polymerization of olefins with high activity catalysts. Makromol. Chem. Suppl.

: 216-218.

Ye, Z.Y., Wang, L., Feng, L.F., Gu, X.P., Chen, H.H., Zhang, P.Y., Pan, J., Jiang, S. and Feng, L.X. 2002. Novel spherical Ziegler-Natta catalyst for polymerization and copolymerization. I. Sperical MgCl2 support. J. Polym. Sci. A, Polym. Chem. 40: 3112-3119.

Ferraris, M., Rosati, F., Parodi, S., Giannetti, E., Motroni, G. and Albizzati, E. 1983. Catalyst components and catalysts for the polymerization of alpha olefins. U.S Patent. 4,399,054.

Ma, Z.L., Wang, L., Wang, W.Q., Feng, L. and Gu, X. 2005. Study of propylene polymerization catalyzed by a spherical MgCl2-supported Ziegler-Natta catalyst system: The effect of external donors. J. Appl. Polym. Sci. 95: 738-742.

Ertl, G., Knozinger, H. and Weitkamp, J. 1999. Preparation of solid catalysts. Weinheim : VCH.

Dusseault, J. J. A. and Hsu, C. C. 1993. MgCl2- supported Ziegler-Natta catalysts for olefin polymerization. Basic structure, mechanism, and kinetic behavior. J. Macromol. Sci. Rev. Macromol. Chem. Phys. C33(2) : 103-145.

Albizzati, E., Cecchin, G., Chadwick, J. C., Collina, G., Giannini, U., Morini, G. and Noristi, L. 2005 In: Pasquini, N. (ed.). Polypropylene Handbook. 2nd ed. Hanser: Munich, chap. 2.

Garoff, T., Palmqvist, U., Sutela, M., Waldvogel, P. and Kostianen, A. 1998. Procatalyst for ethylene polymer production method for its preparation and use. U. S. Patent. 5,770,540.

Rauleder, H., Standke, B., Kotzsch, H. and Schork, R. 1995. Storage-stable solution of carbonated magnesium ethylate in ethanol and their preparation and use. U. S. Patent. 5,456,801.

Kang, K-K., Kim, K-S., Lee, D-H. and Jeong, Y-T. 2001. Propylene polymerization by using TiCl4 catalyst supported on solventactivated Mg(OEt)2. J. Appl. Polym. Sci. 81: 460-467.

Karayannis, N.M. Cohen, S. A. and Ledermann, J.L. 2000. Olefin polymerization and copolymerization catalyst. U. S. Patent. 6,051,524.

Zohuri, G., Ahmadjo, S., Jamjah, R. and Nekoomanesh, M. 2001. Structural study of mono- and bi-supported Ziegler-Natta catalysts of MgCl2/SiO2/TiCl4/donor systems. Iran. Polym. J. 10(3): 149-155.

Chen, Y.P., Fan, Z.Q., Liao, J.H. and Liao, S.Q. 2006. Molecular weight distribution of polyethylene catalyzed by Ziegler-Natta catalyst supported on MgCl2 doped with AlCl3. J. Appl. Polym. Sci. 102: 1768- 1772.

Fregonese, D., Mortara, S.and Bresadola, S., 2001. Ziegler–Natta MgCl2-supported catalysts: relationship between titanium oxidation states distribution and activity in olefin polymerization. J. Mol. Catal. A: Chem. 172 : 89–95.

Job, R. C. 2003. Methods of making magnesium/ transition metal alkoxide complexes and polymerization catalysts made therefrom. U.S. Patent. 6,511,935.

Song, W.D., Chu, K.J., Chang, H. S. and Ihm, S. K. 1993. Model for the formation of active titanium complexes on MgCl2-ethyl benzoateTiCl4 catalysts for propylene polymerization. J. Mol. Catal. 84 : 109-116.

Ferreira, M. L., Juan, A., Castellani, N. J. and Damiani, D. E. 1994. Molecular orbital studies in the MgCl2-ethyl benzoate TiCl4 system. J. Mol. Catal. 87: 137-150.

Wolf, C. R., Forte, M. M., Henrique, J. and Santos, J. H. Z. 2005. Characterization of the nature of chemical species of heterogeneous Ziegler-Natta catalysts for the production of HDPE. Catal. Today. 107-108: 451-457.




How to Cite

A. . Thongdonjui, W. . Trakarnpruk, and . R. H. Strauss, “Effect of electron donor on PE polymerization”, J Met Mater Miner, vol. 19, no. 1, Apr. 2017.



Original Research Articles