Thermorheology as a method to analyze long-chain branched polyethylenes

Thermorheology as a method to analyze long-chain branched polyethylenes This paper presents correlations between polyethylenes of different compositions and branching architectures and their viscoelastic behavior in dependence on the temperature and demonstrates how effectively rheological experiments can be used for analytical purposes. Long-chain branched polyethylenes are known to be thermorheologically complex. But the thermorheological complexity of long-chain branched linear low-density metallocene polyethylenes (LCB-mLLDPE) differs from that of low-density polyethylenes (LDPE) in the way that the activation energy of LDPE becomes constant by a temperature-dependent modification of the moduli whereas a constant activation energy cannot be obtained for LCB-mLLDPE. These findings are explained by the assumption that the LCB-mLLDPE investigated consist of at least two species with distinctly different activation energies. This interpretation is supported by the thermorheological analysis of a blend of known parts of an LDPE and a linear low-density polyethylene (LLDPE). A thermorheological complexity was found similar to that of the LCB-mLLDPE which reflects the different activation energies of the two components. Results of that kind make it possible to get information on the composition of LCB-mLLDPE not available from common analytical methods. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Polymer Elsevier

Thermorheology as a method to analyze long-chain branched polyethylenes

Polymer, Volume 51 (2) – Jan 21, 2010

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Publisher
Elsevier
Copyright
Copyright © 2009 Elsevier Ltd
ISSN
0032-3861
D.O.I.
10.1016/j.polymer.2009.11.005
Publisher site
See Article on Publisher Site

Abstract

This paper presents correlations between polyethylenes of different compositions and branching architectures and their viscoelastic behavior in dependence on the temperature and demonstrates how effectively rheological experiments can be used for analytical purposes. Long-chain branched polyethylenes are known to be thermorheologically complex. But the thermorheological complexity of long-chain branched linear low-density metallocene polyethylenes (LCB-mLLDPE) differs from that of low-density polyethylenes (LDPE) in the way that the activation energy of LDPE becomes constant by a temperature-dependent modification of the moduli whereas a constant activation energy cannot be obtained for LCB-mLLDPE. These findings are explained by the assumption that the LCB-mLLDPE investigated consist of at least two species with distinctly different activation energies. This interpretation is supported by the thermorheological analysis of a blend of known parts of an LDPE and a linear low-density polyethylene (LLDPE). A thermorheological complexity was found similar to that of the LCB-mLLDPE which reflects the different activation energies of the two components. Results of that kind make it possible to get information on the composition of LCB-mLLDPE not available from common analytical methods.

Journal

PolymerElsevier

Published: Jan 21, 2010

References

  • Macromolecules
    Vega, J.F.; Santamaría, A.; Muñoz-Escalona, A.; Lafuente, P.
  • Macromolecules
    Stange, J.; Wächter, S.; Münstedt, H.
  • Macromolecules
    Pearson, D.S.; Helfand, E.

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