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W1993880997 abstract "Polyethylene copolymers prepared using the metallocene catalyst rac-Et[Ind]2ZrCl2 were fractionated by preparative Temperature Rising Elution Fractionation (p-TREF) and characterized by 13C nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC), and gel permeation chromatography (GPC) to study the heterogeneity caused by experimental conditions. Two ethylene–1-hexene copolymers with different 1-hexene content and an ethylene–1-octene copolymer all obtained using low (1.6 bar) ethylene pressure were compared with two ethylene–1-hexene copolymers with different 1-hexene content obtained at high ethylene pressure (7.0 bar). Samples obtained at low ethylene pressure and with low 1-hexene concentration in the reactor presented narrow distributions in composition. Samples prepared with high comonomer concentration in the reactor or with high ethylene pressure showed an heterogeneous composition. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 155–163, 2002; DOI 10.1002/app.10284" @default.
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W1993880997 date "2002-02-14" @default.
W1993880997 modified "2023-10-12" @default.
W1993880997 title "Study of the influence of the reaction parameters on the composition of the metallocene-catalyzed ethylene copolymers using temperature rising elution fractionation and13C nuclear magnetic resonance" @default.
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W1993880997 doi "https://doi.org/10.1002/app.10284" @default.
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