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In‐Situ and Ex‐Situ Microscopic Study of Gas Phase Propylene Polymerization over a High Activity TiCl 4 ‐MgCl 2 Heterogeneous Ziegler‐Natta Catalyst
Author(s) -
Oleshko V. P.,
Crozier P. A.,
Cantrell R. D.,
Westwood A. D.
Publication year - 2001
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/1521-3927(20010101)22:1<34::aid-marc34>3.0.co;2-w
Subject(s) - natta , catalysis , in situ , ziegler–natta catalyst , polymer , polymerization , polymer chemistry , materials science , in situ polymerization , chemical engineering , phase (matter) , propene , microscopy , chemistry , organic chemistry , composite material , optics , physics , engineering
In‐situ gas phase poly(propylene) (PP) formation over a high activity TiCl 4 ‐MgCl 2 ‐supported Ziegler‐Natta catalyst has been studied by video microscopy combined with ex‐situ light microscopy, SEM, high‐resolution TEM, and STEM/PEELS/EDX for the first time. In‐situ observation revealed rapid formation of poly(propylene) beads 9–10 μm in size (< 1/30 s) as well as growth of significant amounts of polymer within local regions. Catalyst particles containing 2–5 nm‐sized MgCl 2 crystalline domains are subjected to transformations during catalysis that form PP/catalyst aggregated structures of 30–50 μm in size.