## Abstract Poly(propylene) samples produced by heterogeneous Ziegler‐Natta catalysts containing different internal electron donors were fractionated by using temperature rising elution fractionation; some key fractions were analyzed with ^13^C NMR. It was found that internal electron donors with d
✦ LIBER ✦
Calixarenes as a new class of external electron donors in Ziegler–Natta polypropylene catalysts
✍ Scribed by Richard A Kemp; David S Brown; Michael Lattman; Jin Li
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 160 KB
- Volume
- 149
- Category
- Article
- ISSN
- 1381-1169
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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