Condensed Mode Cooling for Ethylene Polymerization: Part III. The Impact of Induced Condensing Agents on Particle Morphology and Polymer Properties. Issue 13 (4th May 2016)

• Record Type: Journal Article
• Authors: Namkajorn, Montree; Alizadeh, Arash; Romano, Dario; Rastogi, Sanjay; McKenna, Timothy F. L.
• Is Part Of: Macromolecular chemistry and physics. Volume 217:Issue 13(2016:Jul.)
• Page Start: 1521
• Page End: 1528
• Publication Date: 2016-05-04
• Subjects: ethylene polymerization -- induced condensing agent -- semi‐crystalline polymer -- sorption -- supported catalyst; Polymers -- Periodicals; Polymerization -- Periodicals; Synthetic products -- Periodicals; Macromolecules -- Periodicals; 547.7
• DOI: 10.1002/macp.201600107
• Languages: English
• ISSNs: 1022-1352

Abstract

Abstract : 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. Abstract : It is found that the presence of induced condensing agents (ICAs) during the gas phase ethylene polymerization on supported catalyst increases the crystallinity of high density polyethylene produced. 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.