Polímeros: Ciência e Tecnologia
https://revistapolimeros.org.br/article/doi/10.1590/S0104-14282004000400010
Polímeros: Ciência e Tecnologia
Scientific & Technical Article

Polypropylene obtained through Zeolite Supported Catalysts

Bastos, Queli C.; Marques, Maria de Fátima V.

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Abstract

Propylene polymerizations were carried out with φ2C(Flu)(Cp)ZrCl2 and SiMe2(Ind)2ZrCl2 catalysts supported on silica, zeolite sodic mordenite (NaM) and acid mordenite (HM). The polymerizations were performed at different temperatures and varying aluminium/zirconium molar ratios ([Al]/[Zr]). The effect of these reaction parameters on the catalyst activity was investigated using a proposed statistical experimental planning. In the case of f2C(Flu)(Cp)ZrCl2, SiO2 and NaM were used as support and the catalyst performance evaluated using toluene and pentane as polymerization solvent. The molecular weight, molecular weight distribution, melting point and crystallinity of the polymers were examined. The results indicate very high activities for the syndiospecific heterogeneous system. Also, the polymers obtained had superior Mw and stereoregularity.

Keywords

Isotactic polypropylene, syndiotactic polypropylene, metallocene catalyst, supports

References



1. Alt, G.H.; Schertl, P. & Koppl, A.- Journal of Organometallic Chemistry, 568, p.263 (1998).

2. Meng, F.; Yu, G. & Huang, B.- Journal of Polymer Science. Part A: Polymer Chemistry, 37, p.37 (1999).

3. Tian, J.; Wang; S.; Feng, Y.; Li, J. & Collins, S.- Journal of Molecular Catalysis. A: Chemical, 144, p.137 (1999).

4. Pal, K.- International Polymer Science and Technology, 26, p. 57 (1999).

5. Leaversuch, R.D.- Modern Plastic Int., 7, p. 46 (1996).

6. Ewen, J.A.; Jones, R.L.; Razavi, A. & Ferrara, J.D.J.- Journal of the American Chemical Society, 110, p. 6255 (1992).

7. Bastos, Q.C.- “Sistema de Catalisador Metalocênicos Binário para a Síntese de Polipropileno”. Dissertação de Mestrado, Universidade do Rio de Janeiro, Brasil (2002).

8. Thomas, C. & Mathias, P. – Macromolecules, 33, p. 9452 (2000).

9. Box, G.E.P.; Hunter, W.G & Hunter, J.S.- “Statistics for experiments”, John-Wiley, New York (1978).

10. Bastos, Q.C.; Moreira, S.C.; Rego, J.D. & Marques, M.F.V.-“Syndiotactic polypropylene polymerization using different supported metallocene catalysts”, in: Proceedings of 59th Annual Technical Conference, p. 1683, Dallas-Texas, May (2001).

11. Fink, G.; Mülhaupt, R. & Brintzinger, H. H.- “40 Years Ziegler Catalysts”, Springer Verlag, Heidelberg (1995).

12. Marigo, A.; Marega, C. & Zannetti, R.- Macromol.Rapid comm., 15, p. 225 (1994).

13. Marques, M.F.V.; Lopes, D.E.B. & Rego, J.D.-“Isotactic polypropylene obtained by ethylene bis(1- indenyl)zirconium dichloride and methylaluminoxane catalyst system”, in: Anais do 14°Congresso Brasileiro de Eng. e Ciência dos Materiais, São Pedro-SP, (2000).

14. Marques, M.F.V.; Junior, P.A.C.; Guimarães, M.J.C. & Coutinho, F. M. B.- Polímeros: Ciência e Tecnologia, 3, p. 26 (1998).
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