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Contents Vol 63(8)

Model Linear Low Density Polyethylenes from the ROMP of 5-Hexylcyclooct-1-ene

Shingo Kobayashi A , Christopher W. Macosko B C and Marc A. Hillmyer A C
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- Author Affiliations

A Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, USA.

B Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA.

C Corresponding authors. Email: macosko@umn.edu; hillmyer@umn.edu

Australian Journal of Chemistry 63(8) 1201-1209 https://doi.org/10.1071/CH10039
Submitted: 21 January 2010  Accepted: 12 April 2010   Published: 10 August 2010

Abstract

Model hexyl-branched linear low density polyethylene (C8-LLDPE) samples were synthesized by the ring-opening metathesis copolymerization (ROMP) of the 5-hexylcyclooct-1-ene (1) and cyclooctadiene (COD), followed by catalytic hydrogenation. The ROMP of 1 and copolymerization of 1 and COD using the Grubbs second generation catalyst (G2) afford polymers with the number of hexyl branches based on the feed composition. The resulting hexyl-branched polymers, poly(1) and poly(1-stat-COD), were completely converted into model C8-LLDPE samples by catalytic hydrogenation. The C8-LLDPE samples exhibit the expected reduction in density on branching content. The melting temperature (Tm), crystallization temperature (Tc), and heat of fusion/crystallization (ΔHm/ΔHc) of these materials were studied by differential scanning calorimetry.


Acknowledgements

This work was supported by The Dow Chemical Co. and the Abu Dhabi-Minnesota Institute for Research Excellence (ADMIRE); a partnership between the Petroleum Institute (PI) of Abu Dhabi and the Department of Chemical Engineering and Materials Science of the University of Minnesota. The authors thank Materia, Inc. for a generous donation of G2. S.K. thanks L. M. Pitet for helpful input during the preparation of the manuscript.


References


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