Summary
Copolymers of ethylene and 1-octene, 1-tetradecene and 1-octadecene were synthetized in order to study the effect of the comonomer chain length and amount on density, melting temperature and heat of fusion. They were also compared with the properties of the copolymers obtained with the heterogeneous titanium catalyst.
It could be seen that the density/melting-area of the copolymers obtained with the zirconocene catalyst was much broader than with the titanium catalyst. It could also be seen that with the same comonomer content 1-tetradecene gave lower density of the copolymers than 1-octene. However, no difference were seen between the densities of the copolymers obtained with 1-tetradecene and 1-octadecene.
The melting temperature of the copolymers was seen to be the lower the longer the comonomer was. In the area of the high branching amount the linear correlation was not in work. It was also shown that the differences in the heat of fusions could only be seen at high amount of branches (>15 branches/1000C): the longer the comonomer the lower amount of heat was needed to melt the copolymer.
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References
Kaminsky, W. and Miri, M. J. Polym. Sci., Polym. Chem. Ed. 1985, 23, 2151
Aaltonen, P. and Löfgren, B. submitted to Macromolecules, 1994
Kesti, M.R., Coates, G.W. and Waymouth, R.M. J. Am. Chem. Soc. 1992, 114, 9679
Koivumäki, J. and Seppälä, J. V. Polymer 1993, 34, 1958
Koivumäki, J., Fink, G. and Seppälä, J. V. Macromolecules 1994, 34, 1958
Trudell, B.C., Speed, C.S., and Stehling, F.C., Single Site Catalyzed Ethylene Copolymers: Structure/Property Relationships, AnTec'92, p. 613–617.
Story, B.A. and Knight, G.W. The New Family of Polyolefins from Insite® Technology, MetCon Worldwide Metallocene Conference, May 26–28, 1993, Houston, Texas.
Kissin, Y. V. Isospecific Polymerization of Olefins, Springer-Verlag, New York, 1985, p. 3
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Koivumäki, J. Properties of ethylene/1-octene, 1-tetradecene and 1-octadecene copolymers obtained with Cp2ZrCl2/MAO catalyst: effect of composition and comonomer chain length. Polymer Bulletin 36, 7–12 (1996). https://doi.org/10.1007/BF00296001
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DOI: https://doi.org/10.1007/BF00296001