Microstructure distribution of polypropylenes obtained in the presence of traditional phthalate/silane and novel diether donors: A tool for understanding the role of electron donors in MgCl2-supported ziegler-natta catalysts

Macromolecules

Volumn 29, Issue 18, 1996, Pages 5770-5776

  Morini, Giampiero ^a   Albizzati, Enrico ^a   Balbontin, Giulio ^a   Mingozzi, Ines ^a   Sacchi, Maria Carmela ^b   Forlini, Fabrizio ^b   Tritto, Incoronata ^b  

^a Centro Ricerche G Natta   (Italy)

^b Ist di Chim delle Macromolecole C   (Italy)

Author keywords

[No Author keywords available]

Indexed keywords

CATALYSTS; ELECTRONS; ETHERS; FRACTIONATION; MAGNESIUM COMPOUNDS; MICROSTRUCTURE; MOLECULAR WEIGHT; MONOMERS; POLYMERIZATION; POLYPROPYLENES; SILANES; SYNTHESIS (CHEMICAL);

DIETHERS; ISOSPECIFITY; LEWIS BASES; MOLECULAR MASS DISTRIBUTION; NOVEL DIETHER DONORS; STEREOREGULARITY; TACTICITY; TEMPERATURE RISING ELUTION FRACTIONATION;

MOLECULAR WEIGHT DISTRIBUTION;

EID: 0030216126     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma960070j     Document Type: Article

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22. 14 (Equation Presented) Erythro (or isotactic) is the stereoisomer in which the two first monomeric units have the same configuration and threo (or syndiotactic) that in which they have the opposite configuration. If e and t are the integrated peak areas of the enriched methylene resonances assigned respectively to the erythro and threo placements of the first propylene unit, the molar fraction [e] of the erythro placement represents the extent of the first-step stereoregularity.
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29. 7a,b,16 that 1,3-propane diether donors bearing bulky and branched hydrocarbon substituents have the maximum probability value of oxygen-oxygen distance near 3 Å. Such a distance, similar to the oxygen-oxygen distance of the alkoxy silane donors, is suitable to form strong chelating complexes with the tetracoordinated Mg.