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A Preparation Method for Well‐Defined Crystallites of Mgcl 2 ‐Supported Ziegler‐Natta Catalysts and their Observation by AFM and SEM
Author(s) -
Andoni Adelaida,
Chadwick John C.,
Niemantsverdriet Hans J. W.,
Thüne Peter C.
Publication year - 2007
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/marc.200700222
Subject(s) - crystallite , natta , scanning electron microscope , materials science , wafer , catalysis , ziegler–natta catalyst , chemical engineering , polyethylene , crystallography , chemistry , nanotechnology , polymer , composite material , organic chemistry , polymerization , engineering
A method for the preparation of well‐defined crystallites of MgCl 2 ‐supported Ziegler‐Natta catalysts on Si wafers has been developed. This has been achieved by the spin‐coating of a MgCl 2 solution onto a flat Si wafer, followed by controlled crystal growth to give well‐defined MgCl 2 · n EtOH crystallites. The growth of the crystallites on the flat silica facilitates their characterization using electron and scanning probe microscopy. The relative proportions of 120° and 90° edge angles indicate the preference for the formation of a particular crystallite face for the MgCl 2 . Polyethylene has been identified to be formed on the lateral faces of the crystallite.