Diagnosing long-chain branching in polyethylenes

J. Janzen, Ralph H. Colby

Research output: Contribution to journalArticle

187 Citations (Scopus)

Abstract

We propose a novel method for assessing sparse long-chain branching in synthetic polymers such as high-density polyethylene at levels far below the limits of detectability by the usual methods of solution viscometry, size- exclusion chromatography, and NMR spectrometry on solutions. The new method exploits the extreme sensitivity of melt Newtonian viscosity to random branching architecture, along with the systematic phenomenological description thereof developed recently in fundamental studies by Lusignan et al. The method satisfies the only validation criterion presently available to us: it finds long-branch contents in quantitative agreement with stoichiometric yields calculated for several series of linear precursor polyethylenes treated with very low levels of peroxide.

Original languageEnglish (US)
Pages (from-to)569-583
Number of pages15
JournalJournal of Molecular Structure
Volume485-486
DOIs
StatePublished - Aug 10 1999

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Polyethylenes
Size exclusion chromatography
Viscosity measurement
Peroxides
Polyethylene
Spectrometry
Polymers
Nuclear magnetic resonance
Viscosity

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Spectroscopy
  • Organic Chemistry
  • Inorganic Chemistry

Cite this

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Diagnosing long-chain branching in polyethylenes. / Janzen, J.; Colby, Ralph H.

In: Journal of Molecular Structure, Vol. 485-486, 10.08.1999, p. 569-583.

Research output: Contribution to journalArticle

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