Preparation of shish-kebab and nanofiber polyethylene with chromium/Santa Barbara amorphous silica-15 catalysts
✍ Scribed by Ebrahim Ahmadi; Mehdi Nekoomanesh Haghighi; Zahra Mohamadnia; Ali Ramazani
- Book ID
- 102739258
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 1009 KB
- Volume
- 118
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
Cr/SBA-15 catalysts were prepared by the grafting of chromium nitrate nonahydrate [Cr(NO 3 ) 3 Á9H 2 O] complexes onto SBA-15 mesoporous materials. Shish-kebab and nanofiber polyethylenes (PEs) were prepared under different temperatures via ethylene extrusion polymerization with the Cr(NO 3 ) 3 Á9H 2 O 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 mor-phologies. 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. V