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• W2020672901 abstract "Copolymer composition and comonomer distribution are important magnitudes in polymer material that have a big effect on different kind of properties and consequently there are several ways to study. In this work several ethylene/propylene copolymers synthesized with two different metallocene catalysts and a Ziegler–Natta catalyst and covering a wide composition range were studied. Characterization was carried out by nuclear magnetic resonance (13C NMR) and by gel permeation chromatography with 4 detectors (GPC-4D): refractive index, viscosity, multi-angle light scattering and infrared detectors. Different behaviour in the comonomer distribution along the molecular weight was obtained for metallocene and for ZN copolymers as expected due to the differences between these catalytic systems. Nevertheless, Ziegler–Natta copolymers present more homogeneous comonomer distribution due to the synthesis method. Study of conformation of chains in solution was improved by defining the scaling law of Rg against the number of repeat units because it avoids the effect of the repetitive unit size. Both metallocene copolymer sets show similar dependence of q value with the copolymer composition, however Ziegler–Natta copolymers show different behaviour with q values independent on copolymer composition. This different behaviour has been related with the effects of the heterogeneity of the ethylene distribution and of the molecular weight of the samples." @default.
• W2020672901 created "2016-06-24" @default.
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• W2020672901 creator A5010402233 @default.
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• W2020672901 date "2011-02-01" @default.
• W2020672901 modified "2023-09-23" @default.
• W2020672901 title "Characterization of ethylene/propylene copolymers by means of a GPC-4D technique" @default.
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• W2020672901 doi "https://doi.org/10.1016/j.eurpolymj.2010.11.008" @default.
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