Quantification of branching in model three-arm star polyethylene

Ramnath Ramachandran, Gregory B. Beaucage, Durgesh K. Rai, David J. Lohse, Thomas Sun, Andy Tsou, Alexander Iain Norman, Nikos Hadjichristidis

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The versatility of a novel scaling approach in quantifying the structure of model well-defined 3-arm star polyethylene molecules is presented. Many commercial polyethylenes have long side branches, and the nature and quantity of these branches varies widely among the various forms. For instance, low-density polyethylene (LDPE) is typically a highly branched structure with broad distributions in branch content, branch lengths and branch generation (in hyperbranched structures). This makes it difficult to accurately quantify the structure and the inherent structure-property relationships. To overcome this drawback, model well-defined hydrogenated polybutadiene (HPB) structures have been synthesized via anionic polymerization and hydrogenation to serve as model analogues to long-chain branched polyethylene. In this article, model 3-arm star polyethylene molecules are quantified using the scaling approach. Along with the long-chain branch content in polyethylene, the approach also provides unique measurements of long-chain branch length and hyperbranch content. Such detailed description facilitates better understanding of the effect of branching on the physical properties of polyethylene. © 2012 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)1056-1061
Number of pages6
JournalMacromolecules
Volume45
Issue number2
DOIs
StatePublished - Jan 10 2012

ASJC Scopus subject areas

  • Materials Chemistry
  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry

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