Linear low density polyethylene (LLDPE) from ethylene using TpMsNiCl (TpMs = hydridotris(3-mesitylpyrazol-1-yl)) and Cp2ZrCl2 as a tandem catalyst system
✍ Scribed by Luciano G Furlan; Fábio A Kunrath; Raquel S Mauler; Roberto F de Souza; Osvaldo L Casagrande Jr.
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 130 KB
- Volume
- 214
- Category
- Article
- ISSN
- 1381-1169
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✦ Synopsis
Linear low density polyethylene (LLDPE) with different branching contents were prepared from ethylene, without the addition of ␣-olefin comonomer, using a combination of catalyst precursors {Tp Ms }NiCl (1) (Tp Ms = hydridotris(3-mesitylpyrazol-1-yl)) and Cp 2 ZrCl 2 (2) activated with MAO/TMA (1:1) in toluene at 0 • C and by varying the nickel loading mole fraction (x Ni ). The polymerization results showed that the turnover frequencies are strongly dependent on the x Ni varying from 6.6 × 10 3 to 32.1 × 10 3 mol[C 2 H 4 ]/mol[Zr] h. The 13 C NMR spectra of the copolymers showed that the branch contents of the polymers increase as the x Ni increase in the medium promoting the production of polymers with a wide range of melting point (T m ).