We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Synthesis mechanisms of poly[styrene- co-(acrylic acid)]-supported TiCl<sub>4</sub> catalysts modified by magnesium compounds.
- Authors
Lijun, Du; Jian, Ye; Jingdai, Wang; Binbo, Jiang; Yongrong, Yang
- Abstract
Soluble poly[styrene- co-(acrylic acid)] (PSA) modified by magnesium compounds was used to support TiCl4. For ethylene polymerization, four catalysts were synthesized, namely PSA/TiCl4, PSA/MgCl2/TiCl4, PSA/( n-Bu)MgCl/TiCl4, and PSA/( n-Bu)2Mg/TiCl4. The catalysts were characterized by a set of complementary techniques including X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, and element analysis. Synthesis mechanisms of polymer-supported TiCl4 catalysts were proposed according to their chemical environments and physical structures. The binding energy of Ti 2p in PSA/TiCl4 was extremely low as TiCl4 attracted excessive electrons from COOH groups. Furthermore, the chain structure of PSA was destroyed because of intensive reactions taking place in PSA/TiCl4. With addition of ( n-Bu)MgCl or ( n-Bu)2Mg, COOH became COOMg- which then reacted with TiCl4 in synthesis of PSA/( n-Bu)MgCl/TiCl4 and PSA/( n-Bu)2Mg/TiCl4. Although MgCl2 coordinated with COOH first, TiCl4 would substitute MgCl2 to coordinate with COOH in PSA/MgCl2/TiCl4. Due to the different synthesis mechanisms, the four polymer-supported catalysts correspondingly showed various particle morphologies. Furthermore, the polymer-supported catalyst activity was enhanced by magnesium compounds in the following order: MgCl2 > ( n-Bu)MgCl > ( n-Bu)2Mg > no modifier. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
- Subjects
POLYSTYRENE; ACRYLIC acid; MONOMERS; PHOTOELECTRON spectroscopy; PHOTOELECTRICAL research
- Publication
Journal of Applied Polymer Science, 2012, Vol 123, Issue 4, p2517
- ISSN
0021-8995
- Publication type
Article
- DOI
10.1002/app.34822