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- Title
Hybrid titanium catalyst supported on coreshell silicapolystyrenecoacrylic acid carrier.
- Authors
Lijun Du; Wei Li; Lina Fan; Binbo Jiang; Jingdai Wang; Yongrong Yang; Zuwei Liao
- Abstract
Hybrid titanium catalysts supported on silicapolystyrenecoacrylic acid SiO2PSA coreshell carrier were prepared and studied. The resulting catalysts were characterized by Fourier transform infrared FTIR spectroscopy, laser scattering particle analyzer and scanning electronic microscope SEM. The hybrid catalyst TiCl3MgCl2THFSiO2·TiCl4MgCl2PSA showed coreshell structure and the thickness of the PSA layer in the two different hybrid catalysts was 2.0 μm and 5.0 μm, respectively. The activities of the hybrid catalysts were comparable to the conventional titaniumbased ZieglerNatta catalyst TiCl3MgCl2THFSiO2. The hybrid catalysts showed lower initial polymerization rate and longer polymerization life time compared with TiCl3MgCl2THFSiO2. The activities of the hybrid catalysts were enhanced firstly and then decreased with increasing PH2PC2H4. Higher molecular weight and broader molecular weight distribution MWD of polyethylene produced by the coreshell hybrid catalysts were obtained. Particularly, the hybrid catalyst with a PSA layer of 5.0 μm obtained the longest polymerization life time with the highest activity 2071 kg PE mol−1Ti h−1 and the resulting polyethylene had the broadest MWD polydispersity index 11.5 under our experimental conditions. The morphology of the polyethylene particles produced by the hybrid catalysts was spherical, but with irregular subparticles due to the influence of PSA layer. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010
- Subjects
TITANIUM; POLYMERIZATION; THERMOPLASTICS; CATALYSTS; CHEMICAL inhibitors; POLYETHYLENE; FOURIER transform infrared spectroscopy
- Publication
Journal of Applied Polymer Science, 2010, Vol 118, Issue 3, p1743
- ISSN
0021-8995
- Publication type
Article
- DOI
10.1002/app.32374