Mitsuhiro Okumoto
Osaka University
5 Papers
84 Citations
Mitsuhiro Okumoto is an academic researcher from Osaka University. The author has contributed to research in topics: Virial coefficient & Polystyrene. The author has an hindex of 5, co-authored 5 publications.
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Papers
Excluded-volume effects in star polymer solutions : Four-arm star polystyrene in benzene
TL;DR: In this article, the radius expansion factor and the excluded volume parameter z for Mw > 3 × 105 were determined by light scattering and viscometry for four-arm star polystyrene samples with weight-average molecular weights Mw of 9.1 × 104 to 3.1× 106 in benzene at 25 °C.
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Excluded-Volume Effects in Star Polymer Solutions: Six-Arm Star Polystyrene in Cyclohexane near the ϑ Temperature
TL;DR: In this article, anionically polymerized six-arm star polystyrene samples with weight-average molecular weights Mw of 5.6 × 104−3.2 × 106 were studied by light scattering and viscometry in cyclohexane at different temperatures to determine their z-average mean-square radii of gyration (S2〉z), second and third virial coefficients (A2 and A3), and intrinsic viscosities ([η]).
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Light-Scattering and Phase-Separation Studies on Cyclohexane Solutions of Four-Arm Star Polystyrene
TL;DR: In this paper, light scattering and phase separation experiments were performed on cyclohexane solutions of four narrow-distribution samples of four-arm star polystyrene with molecular weights of 8.5 × 10 4 to 1.4 × 10 6, and the results were compared with literature data for linear poly styrene in cyclomethane.
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Excluded-Volume Effects in Star Polymer Solutions. Six-Arm Star Polystyrene in Benzene
TL;DR: In this article, the relationship between radius expansion factor and the conventional excluded-volume parameter z comes close to the known relations for four-arm star and linear polystyrenes of high molecular weight and is described fairly satisfactorily by the previously proposed interpolation formula.
Light Scattering and Phase Separation Studies on Cyclohexane Solutions of Six-Arm Star Polystyrene
TL;DR: In this paper, light scattering and phase separation experiments were performed for four six-arm star polystyrene (6SPS) samples with weight-average molecular weights Mw of 9.62×104 to 1.16×106 in cyclohexane below the theta temperature (34.5 °C).