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Effect of Substituent on Titanocene/MMAO Catalyst for Ethylene/1-Hexene Copolymerization
Copolymerization of ethylene with 1-hexene was carried out using two ansa-fluorenyl titanium derivative complexes. The substituent effect on the catalytic activity, monomer reactivity ratio and polymer property was investigated. It was found that the presence of t-Bu groups on fluorenyl ring exhibited remarkable catalytic activity and produced polymer with high molecular weight. However, these catalysts produce polymer with narrow molecular weight distribution, indicating the characteristic of single-site metallocene catalyst. Based on 13C NMR, we can observe that monomer reactivity ratio was affected by catalyst structure. The rH values of complex 2 were lower than that of complex 1 which might be result from the higher steric hindrance leading to a reduction of 1- hexene insertion step.
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[1] C. Piel, P. Starck, J.V. Seppälä, and W. Kaminsky, "Thermal and mechanical analysis of metallocene-catalyzed ethene-α-olefin copolymers: The influence of the length and number of the crystallizing side chains," J. Polym. Sci, Part A: Polym. Chem., vol. 44, no. 5, pp. 1600-1612, Mar. 2006.
[2] M. Smit, X. Zheng, R. Br├╝ll, J. Loos, J.C. Chadwick, and C.E. Koning, "Effect of 1-hexene comonomer on polyethylene particle growth and copolymer chemical composition distribution," J. Polym. Sci, Part A: Polym. Chem., vol. 44, no. 9, pp. 2883-2890, May. 2006.
[3] Z.-g. Cai, Y. Nakayama, and T. Shiono, "Substituent effects of tertbutyl groups on fluorenyl ligand of
[tBuNSiMe2Flu]ZrMe2," Chin. J. Polym. Sci., vol. 26, no. 5, pp. 575-578, 2008.
[4] K. Nishii, H. Hagihara, T. Ikeda, M. Akita, and T. Shiono, "Stereospecific Polymerization of Propylene with Group 4 ansa- Fluorenylamidodimethyl Complexes," J. Organomet. Chem., vol. 691, no.1-2, pp. 2883-2890, Jan. 2006.
[5] L.J. Irwin, J.H. Reibenspies, and S.A. Miller, "A sterically expanded "constrained geometry catalyst" for highly active olefin polymerization and copolymerization: an unyielding comonomer effect," J. Am. Chem. Soc., vol. 126, no.51, pp. 16716-16717, Dec. 2004.
[6] H. Li, and Y. Niu, "Ethylene/╬▒-olefin copolymerization by nonbridged(cyclopentadienyl)(aryloxy)titanium(IV) dichloride/AliBu3/Ph3CB(C6F5)4 catalyst systems," J. Appl. Polym. Sci., vol. 121, no.5, pp. 3085-3092, Sep. 2011.
[7] C.J. Price, P.D. Zeits, J.H. Reibenspies, and S.A. Miller, "Octamethyloctahydrodibenzofluorenyl: Electronic Comparisons Between a Sterically Expanded Ligand and its Cyclopentadienyl Analogues," Organometallics, vol. 27, no.15, pp. 3722-3727, Jul. 2008.
[8] H. Hong, Z. Zhang, T. C. M. Chung, and R.W. Lee, "Synthesis of new 1-decene-based LLDPE resins and comparison with the corresponding 1-octene- and 1-hexene-based LLDPE resins," J. Polym Sci, Part A: Polym. Chem., vol. 45, no.4, pp. 639-649, Feb. 2007.
[9] T. Uozumi, and K. Soga, "Copolymerization of olefins with Kaminsky- Sinn-type catalysts," Makromol. Chem., vol. 193, no.4, pp. 823-831, Apr. 1992.
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[11] T. Kelen, F. J. T├╝dös, "Linear method for determining monomer reactivity ratios in copolymerization," J. Macromol. Sci. Chem., A9, pp. 1-27, Apr. 1975.
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