Premium
Catalytic Polymerization of Liquid Propylene: Effect of Low‐Yield Hexene Prepolymerization on Kinetics and Morphology
Author(s) -
Pimplapure Makarand S.,
Weickert Günter
Publication year - 2005
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.200500240
Subject(s) - catalysis , polymerization , yield (engineering) , materials science , particle (ecology) , particle size , chemical engineering , polymer chemistry , polymer , hexane , slurry , ziegler–natta catalyst , natta , morphology (biology) , composite material , chemistry , chromatography , organic chemistry , biology , oceanography , engineering , genetics , geology
Summary: A Ziegler‐Natta‐catalyst was used in ultra low‐yield slurry prepolymerization followed by liquid propylene (main) polymerizations. Complete catalyst disintegration down to 1.5–2 µm particle size is observed at prepolymerization yields of 10 g per g cat. The initial (main) polymerization rate increased up to 55% and the final average particle diameter can be controlled between 50 and 1 500 µm at main polymerization yields of 20 kg PP per g cat · hr −1 . Tension generation within the particle and the absence of a polymer layer explains these results.Surface SEM. Top: Catalyst surface covered with polyhexene. Bottom: Cracks on catalyst surface after washing with hexane.
Accelerating Research
Robert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom
Address
John Eccles HouseRobert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom