Preparation of linear low‐density polyethylene by the in situ copolymerization of ethylene with an iron oligomerization catalyst and rac‐ethylene bis(indenyl) zirconium (IV) dichloride
作者： Zhicheng Zhang , Nannan Cui , Yingying Lu , Yucai Ke , Youliang Hu
DOI: 10.1002/POLA.20560
关键词: Polyethylene 、 Ethylene 、 Melting point 、 Polymer 、 Linear low-density polyethylene 、 Differential scanning calorimetry 、 Gel permeation chromatography 、 Polymer chemistry 、 Chemistry 、 Zirconium
摘要: An iron oligomerization catalyst, [(2-ArN=C(Me)) 2 C 5 H 3 N]FeCl [Ar = 2,6-C 6 (F) ], was combined with rac-ethylene bis(indenyl)zirconium (IV) dichloride [rac-Et(Ind) ZrCl ] to prepare linear low-density polyethylene (LLDPE) by the in situ copolymerization of ethylene. A series LLDPEs different properties were prepared alteration reaction temperature, Fe/Zr molar ratio, Al/(Fe + Zr) and time. The structures polymers characterized differential scanning calorimetry, 13 NMR, gel permeation chromatography (GPC), so forth. melting points, crystallizations, densities resulting products increased, average branching degree decreased, as time increased. when ratio NMR GPC results showed that there no unreacted α-olefins remaining because percentage low-molar-mass sections (C 4 -C 10 ) oligomers obtained this catalyst very high (>70%). In addition, formation two points under conditions examined detail, indicated could be attributed branches.
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