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Received October 1, 2006
Accepted November 6, 2006
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Effect of cocatalyst on the chemical composition distribution and microstructure of ethylene-hexene copolymer produced by a metallocene/Ziegler-Natta hybrid catalyst
School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Shinlim-dong, Kwanak-gu, Seoul 151-744, Korea 1School of Chemical Engineering and Bioengineering, University of Ulsan, Ulsan 680-749, Korea
inksong@snu.ac.kr
Korean Journal of Chemical Engineering, May 2007, 24(3), 403-407(5), 10.1007/s11814-007-0069-8
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Abstract
A silica-magnesium bisupport (SMB) was prepared by a sol-gel method for use as a support for metallocene/Ziegler-Natta hybrid catalyst. The SMB was treated with methylaluminoxane (MAO) prior to the immobilization of TiCl4 and rac-Et(Ind)2ZrCl2. The prepared rac-Et(Ind)2ZrCl2/TiCl4/MAO/SMB catalyst was applied to the ethylenehexene copolymerization with a variation of cocatalyst species (polymerization run 1: triisobutylaluminum (TIBAL) and methylaluminoxane (MAO), polymerization run 2: triethylaluminum (TEA) and methylaluminoxane (MAO)). The effect of cocatalysts on the chemical composition distributions (CCDs) and microstructures of ethylene-hexene copolymers was examined. It was found that the catalytic activity in polymerization run 1 was a little higher than that in polymerization run 2, because of the enhanced catalytic activity at the initial stage in polymerization run 1. The chemical composition distributions (CCDs) in the two copolymers showed six peaks and exhibited a similar trend. However, the lamellas in the ethylene-hexene copolymer produced in polymerization run 1 were distributed over smaller sizes than those in the copolymer produced in polymerization run 2. It was also revealed that the rac-Et(Ind)2ZrCl2/TiCl4/MAO/SMB catalyst preferably produced the ethylene-hexene copolymer with non-blocky sequence when TEA and_x000D_
MAO were used as cocatalysts.
Keywords
References
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Soga K, Kaminaka M, Macromol. Chem. Rapid Comm., 13, 221 (1992)
Soga K, Kaminaka M, Macromol. Chem. Phys., 195, 1369 (1994)
Cho HS, Chung JS, Lee WY, J. Mol. Catal. A-Chem., 159, 203 (2000)
Cho HS, Choi YH, Lee WY, Catal. Today, 63(2-4), 523 (2000)
Cho HS, Chung JS, Han JH, Ko YG, Lee WY, J. Appl. Polym. Sci., 70(9), 1707 (1998)
Cho HS, Lee WY, J. Mol. Catal. A-Chem., 191, 155 (2003)
Chung JS, Cho HS, Ko GY, Lee WY, J. Mol. Catal. A-Chem., 144, 61 (1999)
Ko YG, Cho HS, Choi KH, Lee WY, Korean J. Chem. Eng., 16(5), 562 (1999)
Cho HS, Choi DJ, Lee WY, J. Appl. Polym. Sci., 78(13), 2318 (2000)
Cho HS, Choi KH, Choi DJ, Lee WY, Korean J. Chem. Eng., 17(2), 205 (2000)
Charoenchaidet S, Chavadej S, Gulari E, J. Polym. Sci. A: Polym. Chem., 40(19), 3240 (2002)
Wang Q, Li LD, Fan ZQ, J. Polym. Sci. A: Polym. Chem., 43(8), 1599 (2005)
Hsieh ET, Randall JC, Macromolecules, 15, 1402 (1982)
Wild L, Ryle TR, Knobeloch DC, Peat IR, J. Polym. Sci. A: Polym. Chem., 20, 441 (1982)
Starch P, Polym. Int., 40, 111 (1996)
Czaja K, Sacher B, Bialek M, J. Therm. Anal. Catal., 67, 547 (2002)
Park HW, Chung JS, Baeck SH, Song IK, J. Mol. Catal. A-Chem., 255, 69 (2006)
Hosoda D, Polym. J., 20, 383 (1988)
