The role of some bases in the stereospecific polymerization of propylene with titanium catalysts supported on magnesium chloride

Autor:	Eduardo von Achenbach, Bruno Rotzinger, Piero Pino
Rok vydání:	1985
Předmět:	chemistry.chemical_classification Chemistry Magnesium chemistry.chemical_element Polymer Catalysis chemistry.chemical_compound Monomer Stereospecificity Polymerization Tacticity Polymer chemistry Organic chemistry Lewis acids and bases
Zdroj:	Die Makromolekulare Chemie. 13:105-122
ISSN:	0025-116X
DOI:	10.1002/macp.1985.020131985109
Popis:	The influence of Lewis bases on the stereospecificity and productivity of catalytic systems of the type MgCl2/TiCl4/AlR3 as well as on microtacticity and molecular weight of the polymer fractions has been systematically investigated using propylene as monomer. The results are in keeping with the hypothesis that beside non stereospecific centers two types of stereospecific catalytic centers exist, in one of which the Lewis base is present. The centers can be classified according to their Lewis acidity, the more acidic centers yielding polymers with lower molecular weight and tacticity. The structure of the Lewis bases is of paramount importance in determining the stereospecificity of the catalytic systems and can be used as a probe to investigate the structure of the different catalytic centers.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4ac185848d08a6c471d4b276c8afae8d https://doi.org/10.1002/macp.1985.020131985109 Zobrazit plný text záznamu Plný text