Microstructural analysis of polypropylenes polymerized with Ziegler-Natta catalysts without external donors
✍ Scribed by Ritva Paukkeri; Eero Iiskola; Arja Lehtinen; Hannu Salminen
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 758 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0032-3861
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## 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
Investigation of the effects of hydrogen and different external donors on the stereoregularity and chain-end distribution of polypropylene prepared using MgCl,/TiCl,/phthalate ester-AIEt,alkoxysilane catalyst systems has not only confirmed the importance of regiospecificity in relation to hydrogen a