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

doi:10.1021/ma202031w

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

Department of Advanced Device Materials

Research output: Contribution to journal › Article › peer-review

67 Citations (Scopus)

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 _g∝ _w ^0.60 in a good solvent and as R _g∝ _w ^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 language	English
Pages (from-to)	369-373
Number of pages	5
Journal	Macromolecules
Volume	45
Issue number	1
DOIs	https://doi.org/10.1021/ma202031w
Publication status	Published - Jan 10 2012

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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Radii of gyration of ring-shaped polystyrenes with high purity in dilute solutions. / Takano, Atsushi; Ohta, Yutaka; Masuoka, Keisuke; Matsubara, Kazuki; Nakano, Tomohiro; Hieno, Atsushi; Itakura, Masanao; Takahashi, Kayori; Kinugasa, Shinichi; Kawaguchi, Daisuke ; Takahashi, Yoshiaki; Matsushita, Yushu.

In: Macromolecules, Vol. 45, No. 1, 10.01.2012, p. 369-373.

Research output: Contribution to journal › Article › peer-review

Takano, Atsushi ; Ohta, Yutaka ; Masuoka, Keisuke ; Matsubara, Kazuki ; Nakano, Tomohiro ; Hieno, Atsushi ; Itakura, Masanao ; Takahashi, Kayori ; Kinugasa, Shinichi ; Kawaguchi, Daisuke ; Takahashi, Yoshiaki ; Matsushita, Yushu. / Radii of gyration of ring-shaped polystyrenes with high purity in dilute solutions. In: Macromolecules. 2012 ; Vol. 45, No. 1. pp. 369-373.

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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 g∝ w 0.60 in a good solvent and as R g∝ w 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.",

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AU - Hieno, Atsushi

AU - Itakura, Masanao

AU - Takahashi, Kayori

AU - Kinugasa, Shinichi

AU - Kawaguchi, Daisuke

AU - Takahashi, Yoshiaki

AU - Matsushita, Yushu

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