Recipes for synthesizing polyolefins with tailor-made molecular weight, polydispersity index, long-chain branching frequencies, and chemical composition using combined metallocene catalyst systems in a CSTR at steady state
✍ Scribed by D. Beigzadeh; J. B. P. Soares; Archie E. Hamielec
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 294 KB
- Volume
- 71
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
Polymerization of ethylene in a CSTR using a combined metallocene catalyst system (combination of an open-face catalyst, such as Constrained Geometry Catalyst, and a conventional metallocene catalyst) was studied. Using the model developed by Soares and Hamielec, and expanded by Beigzadeh et al., a steady-state simulator was prepared. The effects of different process parameters (such as reactor residence time) and kinetic parameters of the combined catalyst system on steady-state values of molecular weight, polydispersity index, long-chain branching frequency, and copolymer composition (in the case of copolymerization with ␣-olefins) were investigated. It was shown how recipes for synthesizing polyolefins with tailor-made MWD, CCD, and LCB frequencies can be designed.