POLYMERIZATION OF ETHYLENE USING CP2ZRCL2 METALLOCENE AND METHYLALUMINOXANE HOMOGENEOUS CATALYST SYSTEM

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ZOHOURI GH.H.; JAMJAH R.; AHMADJOU S.

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Journal Paper

Paper Information

Journal: Iranian Polymer Journal Year:2005 | Volume:14 | Issue:2 (56) Page(s): 111-116

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Information Journal Paper

Title

POLYMERIZATION OF ETHYLENE USING CP2ZRCL2 METALLOCENE AND METHYLALUMINOXANE HOMOGENEOUS CATALYST SYSTEM

Author(s)

ZOHOURI GH.H. | JAMJAH R. | AHMADJOU S. | Issue Writer Certificate

Keywords

METALLOCENE

METHYLALUMINOXANE

HOMOGENEOUS CATALYST

ETHYLENE POLYMERIZATION

Abstract

Bis(cyclopentadienyl) zirconium dichloride (Cp2ZrCl2) as a homogeneous METALLOCENE catalyst was manufactured in laboratory scale under highly controlled conditions. ETHYLENE POLYMERIZATION was carried out using this catalyst while, METHYLALUMINOXANE (MAO) was used as a cocatalyst. Activity of 5759 gPE/mmol Zr.h at [Al]/[Zr] molar ratio of 770/1 was obtained. Polymer yield was increased with increasing in [Al]/[Zr] ratio to a limiting value. Addition of hydrogen as a chain transfer agent up to 120 cm3/L solvent, increased the activity of the catalyst. Polymerization was carried out at monomer pressure of 1 to 5 atm, and temperature of 40oC to 80oC. Polymerization activity was increased with increasing temperature to 60oC and slightly decreased with more increase in temperature. Upon the addition of catalyst a sudden increase of 10oC in temperature was observed, particularly when polymerization temperature was higher than 50oC. This increase could be due to high rate of polymerization which at high temperature could affect catalyst activity. Monomer pressure up to 2 atm increased productivity of catalyst. Increase in [Al]/[Zr] ratio, polymerization temperature and H2 concentration decreased Mv of polymer obtained. Melting point of polymer also decreased with increasing [Al]/[Zr] ratio. Density of obtained polyethylene was 0.940-0.950 g/cm3. Tg of one of the polymer samples was determined which was 99.9oC.

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APA: Copy

ZOHOURI, GH.H., JAMJAH, R., & AHMADJOU, S.. (2005). POLYMERIZATION OF ETHYLENE USING CP2ZRCL2 METALLOCENE AND METHYLALUMINOXANE HOMOGENEOUS CATALYST SYSTEM . IRANIAN POLYMER JOURNAL (ENGLISH), 14(2 (56)), 111-116. SID. https://sid.ir/paper/530824/en

Vancouver: Copy

ZOHOURI GH.H., JAMJAH R., AHMADJOU S.. POLYMERIZATION OF ETHYLENE USING CP2ZRCL2 METALLOCENE AND METHYLALUMINOXANE HOMOGENEOUS CATALYST SYSTEM . IRANIAN POLYMER JOURNAL (ENGLISH)[Internet]. 2005;14(2 (56)):111-116. Available from: https://sid.ir/paper/530824/en

IEEE: Copy

GH.H. ZOHOURI, R. JAMJAH, and S. AHMADJOU, “POLYMERIZATION OF ETHYLENE USING CP2ZRCL2 METALLOCENE AND METHYLALUMINOXANE HOMOGENEOUS CATALYST SYSTEM ,” IRANIAN POLYMER JOURNAL (ENGLISH), vol. 14, no. 2 (56), pp. 111–116, 2005, [Online]. Available: https://sid.ir/paper/530824/en

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