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New Quenching Procedure for Preservation of Initial Polymer/Catalyst Particle Morphology in Ziegler–Natta Olefin Polymerization
Author(s) -
Thang Vu Quoc,
Taniike Toshiaki,
Umemori Masaki,
Ikeya Mitsuhiro,
Hiraoka Yuichi,
Nghia Nguyen Duc,
Terano Minoru
Publication year - 2009
Publication title -
macromolecular reaction engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 32
eISSN - 1862-8338
pISSN - 1862-832X
DOI - 10.1002/mren.200900030
Subject(s) - natta , polymerization , particle (ecology) , polymer , ziegler–natta catalyst , heptane , materials science , polymer chemistry , catalysis , morphology (biology) , chemical engineering , quenching (fluorescence) , particle size , chemistry , composite material , organic chemistry , optics , oceanography , physics , fluorescence , biology , engineering , genetics , geology
Preservation of initial polymer/catalyst particle morphology under air, was examined using stopped‐flow Ziegler–Natta polymerization with various quenching conditions and post‐chemical treatments. The exposure of the initial particles to air caused the fast formation of cracks on the surface, finally leading to significant reformation of the particle shape, when polymerizing particles were washed with heptane at −65 °C under N 2 or under CO 2 . On the other hand, when the particles were washed with heptane containing an appropriate amount of tetrahydrofuran under CO 2 , the particle morphology under air was almost completely maintained even after 1 h exposure. The present results are useful for various ex situ characterizations of unstable initial polymer/catalyst particles.