Defined Comonomer Re-Feeding During the Metallocene-Catalyzed Copolymerization of 10-Undecene-1-olate with Propene through FTIR In-Line Monitoring

✍ Scribed by Karin Sahre; Ulrich Schulze; Klaus-J. Eichhorn; Brigitte Voit

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 283 KB
• Volume: 294
• Category: Article
• ISSN: 1438-7492
• DOI: 10.1002/mame.200800329

✦ Synopsis

Abstract

The consumption of 10‐undecene‐1‐olate (UOA) during its continuous re‐feeding in the metallocene‐catalyzed copolymerization with propene was investigated by ATR‐FTIR spectroscopy in‐line monitoring through evaluation of the integral absorbances of the characteristic IR bands. For the quantitative determination of the comonomer concentration during the copolymerization reaction with and without continuous re‐feeding of UOA, multiple calibration functions based on the chemometric partial least squares method were applied. For the first time, a direct correlation between the consumption of an olefin and the addition of a polar comonomer during a metallocene‐catalyzed copolymerization was demonstrated. By means of this technique, a relatively constant molar stoichiometric ratio of the comonomer and propene over the whole polymerization time was achieved, which is very important in obtaining copolymers with defined random structure and, thus, from the point of view of reaction engineering, constant product quality.

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