Radii of gyration of ring-shaped polystyrenes with high purity in dilute solutions

Atsushi Takano, Yutaka Ohta, Keisuke Masuoka, Kazuki Matsubara, Tomohiro Nakano, Atsushi Hieno, Masanao Itakura, Kayori Takahashi, Shinichi Kinugasa, Daisuke Kawaguchi, Yoshiaki Takahashi, Yushu Matsushita

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Abstract

Ring polystyrenes (PSs) were synthesized by anionic polymerization technique and purified with preparative size-exclusion chromatography (SEC). Seven ring PSs with their weight-average molecular weight (M w) ranging from 17k to 570k were prepared and they were confirmed to have high purities all over 96% by liquid chromatography at the chromatographic critical condition (LCCC) analyses. Their radii of gyration (R gs) were determined in benzene-d 6 as a good solvent and in cyclohexane-d 12 or cyclohexane-h 12 as θ solvents by small-angle neutron scattering (SANS) or light scattering (LS). It has been found that R gs of ring polymers are scaled with M w as R gw 0.60 in a good solvent and as R gw 0.53 in θ solvents. Moreover it was confirmed that g factors, R g 2 (Ring)/R g 2 (Linear), obtained in θ solvents are meaningfully larger than theoretically predicted values owing to the topological effect stored in ring molecules.

Original languageEnglish
Pages (from-to)369-373
Number of pages5
JournalMacromolecules
Volume45
Issue number1
DOIs
Publication statusPublished - Jan 10 2012

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All Science Journal Classification (ASJC) codes

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

Cite this

Takano, A., Ohta, Y., Masuoka, K., Matsubara, K., Nakano, T., Hieno, A., ... Matsushita, Y. (2012). Radii of gyration of ring-shaped polystyrenes with high purity in dilute solutions. Macromolecules, 45(1), 369-373. https://doi.org/10.1021/ma202031w