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Condensed Mode Cooling for Ethylene Polymerization: Part III. The Impact of Induced Condensing Agents on Particle Morphology and Polymer Properties
Author(s) -
Namkajorn Montree,
Alizadeh Arash,
Romano Dario,
Rastogi Sanjay,
McKenna Timothy F. L.
Publication year - 2016
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201600107
Subject(s) - crystallinity , polymer , polymerization , polymer chemistry , crystallization , polyethylene , chemical engineering , materials science , annealing (glass) , molar mass distribution , solvent , ethylene , chemistry , organic chemistry , catalysis , composite material , engineering
The presence of different commonly used induced condensing agents (ICAs) in the gas phase polymerization of ethylene on the supported catalyst has a significant impact on the crystallinity and the molecular weight distribution of the resulting high density polyethylene. The crystallinity of the polymer is found to be higher in the presence of vaporized n ‐pentane or n‐ hexane, than in “dry mode” (i.e., with no ICA). This is primarily attributed to the mechanism of crystallization of polymer chains in presence of the solubilized ICA which might act to promote solvent vapor annealing. In addition, vaporized ICA also provokes a significant increase in the weight average molecular weight, with values being estimated at over one million.