Characterization of a 4-miktoarm star copolymer of the (PS- b -PI) 3 PS type by temperature gradient interaction chromatography

Donghyun Cho, Soojin Park, Taihyun Chang*, Apostolos Avgeropoulos, Nikolaos Hadjichristidis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Temperature gradient interaction chromatography (TGIC) was applied for the separation of a complex miktoarm star copolymer which has one polystyrene (PS) arm and three polystyrene-b-polyisoprene (PS-b-PI) diblock copolymer arms. Such miktoarm star polymers are much more difficult to characterize than branched homopolymers since the byproduct, typically polymers with missing arm(s) or coupled products, have not only different molecular weights but also different compositions. TGIC was able to fully separate the byproducts, and the composition of the molecular species corresponding to the different separated elution peaks was determined by two methods, fractionation/NMR and multiple detection (UV and RI). A reasonable agreement between the results of the two methods was obtained. By using the composition found, the corresponding molecular weights were determined by multi-angle light scattering detection. Based on the composition and the molecular weight we were able to identify the structure of the different molecular species.

Original languageEnglish (US)
Pages (from-to)2155-2160
Number of pages6
JournalEuropean Polymer Journal
Volume39
Issue number11
DOIs
StatePublished - Nov 1 2003

Keywords

  • 4-Miktoarm star copolymer
  • Multiple detection
  • Temperature gradient interaction chromatography

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Polymers and Plastics
  • Organic Chemistry

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