Activation effect of alkoxysilanes as external donors in magnesium chloride-supported Ziegler-Natta catalysts
✍ Scribed by Sacchi, Maria Carmela; Forlini, Fabrizio; Tritto, Incoronata; Mendichi, Raniero; Zannoni, Giulio; Noristi, Luciano
- Book ID
- 115544419
- Publisher
- American Chemical Society
- Year
- 1992
- Tongue
- English
- Weight
- 637 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0024-9297
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## Abstract The effects of different alkoxysilane donors (Ph(EtO)~3~Si, Me(EtO)~3~Si and Ph~2~(EtO)~2~Si) have been compared in propene/1‐butene copolymerization with MgCl~2~‐supported Ziegler‐Natta catalysts. The copolymers obtained were fractionated and the fractions characterized by ^13^C NMR an
## Abstract ^13^C NMR analysis of relatively low‐molecular‐weight polypropylenes prepared using the catalyst system MgCl~2~/TiCl~4~/phthalate ester‐AlEt~3~‐external Lewis base has revealed the presence of up to around 20% butyl (__n__‐Bu) chain ends, indicative of regioirregular (2,1‐) monomer inse