Control of Molecular Weight Distribution for Polypropylene Obtained by Commercial Ziegler-Natta Catalyst: Effect of Electron Donor

He-Xin Zhang; Young-Joo Lee; Joon-Ryeo Park; Dong-Ho Lee; Keun-Byoung Yoon

Macromolecular Research, Vol.19, No.6, 622-628, June, 2011

DOI10.1007/s13233-011-0614-5 Export Citation

Control of Molecular Weight Distribution for Polypropylene Obtained by Commercial Ziegler-Natta Catalyst: Effect of Electron Donor

He-Xin Zhang^{1, 2}, Young-Joo Lee³, Joon-Ryeo Park³, Dong-Ho Lee⁴, and Keun-Byoung Yoon^{1, 5, †}

¹Laboratory of Polymer Engineering, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, 130-022, PR China
²Department of Polymer Science and Engineering, Kyungpook National University, Daegu, 702-701, Korea
³Catalyst&Process Development Division, R&D Center Samsung Total Petrochemicals Co. Ltd., Chungnam, 356-874, Korea
⁴Dongyang Mirae University, Seoul, 152-714, Korea
⁵, China

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Polymerization of propylene was carried out using a MgCl2-supported TiCl4 catalyst in conjunction with triethylaluminium (TEA) as the cocatalyst and various types of alkoxy silane compounds as an external donor. The effect of the external donor on the performance of the catalyst with different internal donors was investigated. The polydispersity index (PDI) of polypropylene (PP) obtained with the diether and succinate based catalyst were decreased with the introduction of an external donor and the PDI increased for the phthalate based catalyst. The molecular weight and PDI increased with the introduction of an external donor. The highest PDI of PP was obtained by polymerization with di-n-propyldimethoxysilane (DnPDMS) as an external donor. In addition, a mixture of external donors was used to control the PDI of PP and the composition of the catalyst was examined after treated with TEA/external donor. Furthermore, the theoretical PDI value was calculated for a mixture of external donor systems. The PDI of PP could be controlled and predicted while retaining high activity, high isospecificity and high molecular weight by changing the structure of the external donor and/or their mixture.

Keywords:polypropylene;molecular weight distribution;internal donor;external donor.

[References]

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Liu B, Nitta T, Nakatani H, Terano M, Macromol. Chem. Phys., 204, 395 (2003)
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[Related Articles]

[1] Kissin YV, Alkene Polymerization Reactions with Transition Metal Catalysts, Elsevier, Amsterdam, 2008.

[2] Kashiwa N, J. Polym. Sci. A: Polym. Chem., 42(1), 1 (2004)

[3] Soga K, Shiono T, Doi Y, Makromol. Chem., 189, 1531 (1988)

[4] Sacchi MC, Forlini F, Tritto I, Locatelli P, Morini G, Noristi L, Albizzati E, Macromolecules, 29(10), 3341 (1996)

[5] Gao MZ, Liu HT, Wang J, Li CX, Ma J, Wei GS, Polymer, 45(7), 2175 (2004)

[6] Keii T, Doi Y, Suzuki E, Tamura M, Murata M, Soga K, Makromol. Chem., 185, 1537 (1984)

[7] Forte MC, Coutinho FMB, Eur. Polym. J., 32, 605 (1996)

[8] Cecchin G, Morini G, Pelliconi A, Macromol. Symp., 173, 195 (2001)

[9] Morini G, Balbontin G, Gulevich Y, Duijghuisen H, Kelder R, Klusener PA, Korndorffer F, WO 0063261 (2000).

[10] Correa A, Piemontesi F, Morini G, Cavallo L, Macromolecules, 40(25), 9181 (2007)

[11] Matsuoka H, Liu B, Nakaani H, Nishiyama I, Terano M, Polym. Int., 51, 781 (2002)

[12] Lee DH, Jeong YT, Eur. Polym. J., 29, 883 (1993)

[13] Sacchi MC, Forlini F, Tritto I, Mendichi R, Zannoni G, Noristi L, Macromolecules, 25, 5914 (1992)

[14] Proto A, Oliva L, Pellecchia C, Sivak AJ, Cullo LA, Macromolecules, 23, 2904 (1990)

[15] Park JR, Jang HS, Kim SY, An JK, KR-A-10-2006-0038102 (2006).

[16] Galimberti M, Piemontesi F, Giannini U, Albizzati E, Macromolecules, 26, 6771 (1993)

[17] Seppala JV, Harkonen M, Luciani L, Makromol. Chem., 190, 2535 (1989)

[18] Harkonen M, Seppala JV, Vaananen T, Makromol. Chem., 192, 721 (1991)

[19] Chen YP, Fan ZQ, Liao JH, Liao SQ, J. Appl. Polym. Sci., 102(2), 1768 (2006)

[20] Tzoganakis C, Vlachopoulos J, Hamielec AE, Shinozaki DM, Polym. Eng. Sci., 29, 390 (1989)

[21] Kissin YV, Ohnishi R, Konakazawa T, Macromol. Chem. Phys., 205, 284 (2004)

[22] Krigbaum WR, Uematsu I, J. Polym. Sci. A: Polym. Chem., 3, 767 (1965)

[23] Albizzati E, Giannini U, Morini G, Smith AC, Ziegler RC, Ziegler Catalysts, Fink G, Mulhaupt R, Britzinger HH, Eds., Springer-Verlag, Berlin, 1995, pp 413-425.

[24] Kissin YV, J. Polym. Sci. A: Polym. Chem., 41(12), 1745 (2003)

[25] Liu B, Nitta T, Nakatani H, Terano M, Macromol. Chem. Phys., 204, 395 (2003)

[26] Kakugo M, Miyatake T, Naito Y, Mizunuma K, Macromolecules, 21, 314 (1988)

[27] Soga K, Shiono T, Transition Metal Catalyzed Polymerizations, Quirk RP, Ed., Cambridge University Press, Cambridge, 1988, pp 266-279.