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• W2040478022 abstract "Thermal and mechanical properties of ethylene/α-olefin copolymers (LLDPE) produced over bis(2-methyl indenyl)zirconium dichloride((2-MeInd)2ZrCl2) were compared with those of LLDPEs synthesized with a conventional heterogeneous Ziegler–Natta (Z–N) catalyst, titanium tetrachloride supported on magnesium diethoxide with diisobutyl phthalate as an internal donor(Mg(OEt)2/DIBP/TiCl4). DSC thermogram of LLDPE by the Z–N catalyst showed that the melting peak moved to a lower temperature region and the peak became broader as the density of LLDPE decreased. On the other hand, in case of LLDPE produced over (2-MeInd)2ZrCl2, the melting peak shifted to a lower temperature zone with the decreasing copolymer density without a significant loss in the peak sharpness. The density of LLDPE was a decreasing function of mole fraction of α-olefin, and the decrease was more pronounced as the molecular weight of the incorporated α-olefin increased. However, when the density was plotted against weight fraction of α-olefin, a similar declining curve was observed irrespective of the type of α-olefins except the LLDPE made by the Z–N catalyst in which more α-olefin units were required to reach the same density as that of LLDPEs by (2-MeInd)2ZrCl2. LLDPE made by the Z–N catalyst had lower tensile strength but similar elongation and elastic modulus compared to those of poly(ethylene-co-1-dodecene) and poly(ethylene-co-1-octadecene) synthesized by (2-MeInd)2ZrCl2. Poly(ethylene-co-1-hexene) by (2-MeInd)2ZrCl2, however, exhibited lower elastic modulus and higher elongation compared with the other LLDPEs. Measurement of dynamic mechanical properties of LLDPEs revealed that β-transition peak appeared at a lower temperature and became more intense, as the density decreased, until the crystallinity of LLDPEs disappeared completely when the β-transition peak became fixed around −45°C. γ-transition was monitored at around −125°C and was thought to be induced by the limited motion of the main backbone chain." @default.
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• W2040478022 date "2000-06-01" @default.
• W2040478022 modified "2023-09-27" @default.
• W2040478022 title "Thermal and mechanical properties of ethylene/α-olefin copolymers produced over (2-MeInd)2ZrCl2/MAO system" @default.
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• W2040478022 doi "https://doi.org/10.1016/s0032-3861(99)00671-0" @default.
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