Direct synthesis of fibrous high molecular weight polyethylene using vanadium catalysts supported on an SiO2 ionic liquid system
作者： Wioletta Ochędzan-Siodłak , Anna Bihun
DOI: 10.1002/PI.4958
关键词:
摘要: Polyethylene of fibrous morphology was obtained using Cp2VCl2 and VCl2(salenCl2) catalysts activated by AlEt2Cl AlEtCl2 heterogenized on a supported ionic liquid system prepared with SiO2 1-(3-triethoxysilyl)propyl-3-methylimidazolium chloroaluminate. The fibre length ranges from 15 to 60 µm, depending the reaction conditions. polyethylene is characterized high molecular weight ((1.1–2.4) × 106 g mol−1) narrow distribution (1.4–2.5). It linear polymer, properly without branching. DSC method reveals characteristic changes in melting temperature crystallinity degree between first second scan heating cycles (141 °C 136 °C, 71% 46%, respectively). wide angle X-ray spectroscopy Fourier transform infrared methods give values 40% 41%–51%. influence type catalyst precursor, alkylaluminium activator, catalyst/activator molar ratio, time discussed. © 2015 Society Chemical Industry
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