Synthesizing ethylene/1-octene copolymer and its nanocomposites with graphene and carbon nanotubes using a Ziegler − Natta catalyst
Copolymerization of ethylene and 1-octene was carried out using a Ziegler-Natta catalyst and the optimization of copolymerization conditions was studied. The optimum polymerization activity was obtained at 60 °C and [Al]:[Ti] molar ratio of 143:1. It was observed that the increase in the comonomer r...
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Published in | Journal of macromolecular science. Part A, Pure and applied chemistry Vol. 57; no. 11; pp. 761 - 768 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
New York
Taylor & Francis
01.11.2020
Marcel Dekker, Inc |
Subjects | |
Online Access | Get full text |
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Summary: | Copolymerization of ethylene and 1-octene was carried out using a Ziegler-Natta catalyst and the optimization of copolymerization conditions was studied. The optimum polymerization activity was obtained at 60 °C and [Al]:[Ti] molar ratio of 143:1. It was observed that the increase in the comonomer ratio in the feedstock influenced the physical properties of the final copolymer obtained. The results showed a range of crystallinity (X
c
) from 68.5% to 34.8% and a range of melting temperature (Tm) from 140 °C to 129 °C for the synthesized copolymers. The viscosity average molecular weight (M̅
v
) of the polymers decreased as the polymerization temperature increased, however, by increasing the monomer pressure, the M̅
v
of the polymers and the catalyst activity increased. Polymer nanocomposites containing graphene and multi-walled carbon nanotubes with different particle sizes were prepared under the optimum copolymerization conditions. The addition of graphene and multi-walled carbon nanotubes decreased the activity of the catalyst. However, the thermal stability, and crystallinity of the polymers were found to be increased. |
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ISSN: | 1060-1325 1520-5738 |
DOI: | 10.1080/10601325.2020.1774389 |