PL EN


Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników
Czasopismo
2003 | 1 | 4 | 325-338
Tytuł artykułu

Combined polymerization catalysis of nickel complex and zirconocene for branched polyethylene

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The polymerization behavior of 2-(2′-pyridyl) quinoxaline nickel dibromide/Cp2ZrCl2/MAO system was investigated in three ways: the Ni catalyst was added first, followed by addition of Zr catalyst (method I); the Ni and Zr catalysts were added simultaneously (method II); and the Zr catalyst was added first, followed by addition of Ni catalyst (method III). Results of GC-MS, GPC,13C NMR and DSC investigations indicated that the properties of resulting polyethylene were greatly varied by changing feeding orders of the two catalysts. Decreasing Ni/Zr molar ratio or increasing polymerization temperature gave corresponding polyethylenes with less branches and higher melting point. Compared to the procedure using Cp2ZrCl2 catalyst only, the activity of Zr catalyst in those combined system decreased because of the competition of ethylene between the [Ni−C] and [Zr−C] active centers. In addition, other zirconocenes were also employed as copolymerization catalysts in the combined system with nickel complex. compared to Cp2ZrCl2 case, the ethyl-bridged Zr catalyst performed better for polymerization of ethylene while the Si-bridged Zr catalyst showed better copolymerization ability.
Wydawca

Czasopismo
Rocznik
Tom
1
Numer
4
Strony
325-338
Opis fizyczny
Daty
wydano
2003-12-01
online
2003-12-01
Bibliografia
  • [1] W. Kaminsky: “Highly active metallocene catalysts for olefin polymerization”, J. Chem. Soc., Dalton Trans. (1998), pp. 1413–1418. [Crossref]
  • [2] W. Kaminsky: “New polymers by metallocene catalysis”, Macromol. Chem. Phys., Vol. 197, (1996), pp. 3907–3945. http://dx.doi.org/10.1002/macp.1996.021971201[Crossref]
  • [3] H.G. Alt, A. Köppl: “Effect of the nature of metallocene complexes of group IV metals on their performance in catalytic ethylene and propylene polymerization”, Chem. Rev., Vol. 100, (2000), pp. 1205–1221. http://dx.doi.org/10.1021/cr9804700[Crossref]
  • [4] R. Quijada, A. Narváez, R. Rojas, F.M. Rabagliati, G.B. Galland, R.S. Mauler, R. Benavente, E. Pérez, J.M. Pereña, A. Bello: “Synthesis and characterization of copolymers of ethylena and 1-octadecene using the rac-Et(Ind)2ZrCl2/MAO catalyst system”, Macromol. Chem. Phys., Vol. 200, (1999), pp. 1306–1310. http://dx.doi.org/10.1002/(SICI)1521-3935(19990601)200:6<1306::AID-MACP1306>3.0.CO;2-4[Crossref]
  • [5] R. Quijada, G.B. Galland, R.S. Mauler: “The influence of the comonomer in the copolymerization of ethylene with α-olefin using C2H2[Ind]2ZrCl2 methylaluminoxane as catalyst system”, Macromol. Chem. Phys., Vol. 197, (1996), pp. 3091–3098. http://dx.doi.org/10.1002/macp.1996.021971003[Crossref]
  • [6] S. Mecking: “Reactor blending with early/late transition metal catalyst combinations in ethylene polymerization”, Macromol. Rapid Commun., Vol. 20, (1999), pp. 139–143. http://dx.doi.org/10.1002/(SICI)1521-3927(19990301)20:3<139::AID-MARC139>3.0.CO;2-R[Crossref]
  • [7] R.W. Barnhart, G.C. Bazan, T. Mourey: “Synthesis of Branched Polyolefins Using a Combination of Homogeneous Metallocene Mimics”, J. Am. Chem. Soc., Vol. 120, (1998), pp. 1082–1083. http://dx.doi.org/10.1021/ja9735867[Crossref]
  • [8] L.K. Johnson, C.M. Killian, M. Brookhart: “New Pd(II)- and Ni (II)-based catalysts for polymerization of ethylene and α-olefin”, J. Am. Chem. Soc., Vol. 117, (1995), pp. 6411–6415.
  • [9] F.A. Kunrath, R.F. de Souza, O.L. Casagrande Jr.: “Combination of nickel and titanium complexes containing nitrogen ligands as catalyst for polyethylene reactor blending”, Macromol. Rapid Commun., Vol. 21, (2000), pp. 277–280. http://dx.doi.org/10.1002/(SICI)1521-3927(20000301)21:6<277::AID-MARC277>3.0.CO;2-#[Crossref]
  • [10] R. Quijada, R. Rojas, G. Bazan, Z.J.A. Komon, R.S. Mauler, G.B. Galland: “Synthesis of branched polyethylene from ethylene by tandem action of iron and zirconium single site catalysts”, Macromolecules, Vol. 34, (2001), pp. 2411–2417. http://dx.doi.org/10.1021/ma0012088[Crossref]
  • [11] G.B. Galland, R. Quijada, R. Rojas, G. Bazan, Z.J.A. Komon: “NMR study of branched polyethylene obtained with combined Fe and Zr catalysts”, Macromolecules, Vol. 35, (2002), pp. 339–345. http://dx.doi.org/10.1021/ma010744c[Crossref]
  • [12] Z.L. Li, N. Zhu, W.-H. Sun, C.X. Shao, Y.C. Ke, Y.L. Hu, J.S. He: “Combination of 8-aminoquinoline nickel dichloride and Cp2ZrCl2 catalysts for ethylene polymerization”, Polym. Int., Vol. 50, (2001), pp. 1275–1278. http://dx.doi.org/10.1002/pi.810[Crossref]
  • [13] C.X. Shao, W.-H. Sun, Z.L. Li, Y.L. Hu, N. Zhu, LQ. Han: “Ethylene oligomerization promoted by group VIII metal complexes containing 2-(2′-pryridyl) quinoxaline ligands”, Cat. Comm., Vol. 3, (2002), pp. 405–410. http://dx.doi.org/10.1016/S1566-7367(02)00158-9[Crossref]
  • [14] D.E. Axelson, G.C. Levy, L. Mandelkern: “A quantitative analysis of low-density (branched) polyethylenes by C-13 Fourier transform nuclear magnetic resonance at 67.9MHz”, Macromolecules, Vol. 12, (1979), pp. 41–52. http://dx.doi.org/10.1021/ma60067a010
  • [15] R. Quijada, J. Dupont, M.S.L. Miranda, R.B. Scipioni, G.B. Galland: “Copolymerization of ethylene with 1-hexene and 1-octene: correlation between type of catalyst and comonomer incorporated”, Macromol. Chem. Phys., Vol. 196, (1995), pp. 3991–4000. http://dx.doi.org/10.1002/macp.1995.021961210[Crossref]
  • [16] K. Soga, M. Kaminaka: “Polymerization of propene with zirconocene-containing supported catalysts activated by common trialkylaluminiums”, Macromol. Chem., Vol. 194, (1993), pp. 1745–1755. http://dx.doi.org/10.1002/macp.1993.021940621[Crossref]
  • [17] J.C. Randall: “A review of high resolution liquid 13C nuclear magnetic resonance characterizations of ethylene-based polymers”, J. Macromol Sci. Rev. Macromol. Chem. Phys., Vol. C 29, (1989), pp. 201–317. [Crossref]
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_BF02475220
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.