Enhancement of Productivity, Molecular Weight and Stereoregularity of 1-Butene Polymerization by MAO Modification

✍ Scribed by Masayuki Fujita; Yoshinori Seki; Tatsuya Miyatake

• Book ID: 102482985
• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 74 KB
• Volume: 205
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200400060

✦ Synopsis

Abstract

Summary: The modification of MMAO using water and pentafluorophenol enhances the productivity, molecular weight, regioregularity and stereoregularity of the polymer obtained from the polymerization of 1‐butene with TBPTiCl~2~. The structural changes in water modified‐MMAO (WM‐MMAO) and water/pentafluorophenol‐modified‐MMAO (W/PM‐MMAO) were revealed by ^27^Al MAS NMR. Although only 4‐ and 6‐coordinated aluminium species existed in the MMAO, a new peak derived from a 5‐coordinated Al species appeared when the water or water/phenol modification was carried out. This result suggests that a 5‐coordinated aluminium species of WM‐ or W/PM‐MMAO might significantly influence the behavior of the single‐site catalyst.

Structure of the here used catalyst.

imageStructure of the here used catalyst.