Preparation of shish‐kebab and nanofiber polyethylene with chromium/Santa Barbara amorphous silica‐15 catalysts |
| |
| Authors: | Ebrahim Ahmadi Mehdi Nekoomanesh Haghighi Zahra Mohamadnia Ali Ramazani |
| |
| Affiliation: | 1. Chemistry Department, Zanjan University, P.O. Box 45195‐313, Zanjan, Iran;2. Department of Polymerization Engineering, Iran Polymer and Petrochemical Institute, P.O. Box 14965‐115, Tehran, Iran |
| |
| Abstract: | Cr/SBA‐15 catalysts were prepared by the grafting of chromium nitrate nonahydrate Cr(NO3)3·9H2O] complexes onto SBA‐15 mesoporous materials. Shish‐kebab and nanofiber polyethylenes (PEs) were prepared under different temperatures via ethylene extrusion polymerization with the Cr(NO3)3·9H2O catalytic system. The diameter of a single nanofiber was 100–250 nm. Scanning electron microscopy images showed that the polymer obtained from the SBA‐15‐supported catalyst under different polymerization temperatures produced nanofiber and/or shish‐kebab morphologies. X‐ray diffraction and differential scanning calorimetry were used to characterize microstructures of the materials. Polymers obtained with all of the catalysts showed a melting temperature, bulk density, and high load melt index; this indicated the formation of linear high‐density PE. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 |
| |
| Keywords: | catalysts fibers polyethylene (PE) supports templates |
|
|
