Conformations of Ring Polystyrenes in Bulk Studied by SANS

Takuro Iwamoto, Yuya Doi, Keita Kinoshita, Yutaka Ohta, Atsushi Takano, Yoshiaki Takahashi, Michihiro Nagao, Yushu Matsushita

研究成果: ジャーナルへの寄稿記事

5 引用 (Scopus)

抄録

We prepared five pairs of hydrogenous and deuterated ring polystyrene samples over a wide range of molecular weights (10 kg/mol ≤ Mw ≤ 400 kg/mol) and investigated their chain conformations in bulk by small-angle neutron scattering (SANS) measurements. From the SANS profiles obtained, we estimated the radii of gyration Rg of the ring polymers by the Guinier approximation. Rg can be related to the degree of polymerization N as Rg ∼ N0.47. This scaling exponent ν = 0.47 ± 0.01 is evidently smaller than that for the Gaussian chains (ν = 0.50) but higher than previous experimental reports (ν = 0.42-0.43). Then our data were compared with various simulation and experimental data by introducing the entanglement degree of polymerization Ne for linear polymers as a normalized parameter. Rg of three smaller rings, i.e., R-10, R-30, and R-70, where the numbers denote molecular weights in kg/mol unit, are in good agreement with simulation results, while two larger rings, R-100 and R-400, exhibit higher Rg values than the simulations. Considering that the latter two higher molecular weight samples include maximum 3% of linear contamination, their effects on chain dimension were calculated. As a result, it has been confirmed that 3% of linear contaminations can overestimate Rg of rings as much as 6% for R-100 and 12% for R-400. Thus, Rg for pure large rings should be considerably lower than the present experimental values. We conclude Flory's exponent v in Rg ∼ Nv for rings may not be constant but rather show molecular weight dependence due to their topological constraint.

元の言語英語
ページ(範囲)1539-1548
ページ数10
ジャーナルMacromolecules
51
発行部数4
DOI
出版物ステータス出版済み - 2 27 2018

Fingerprint

Polystyrenes
Neutron scattering
Conformations
Molecular weight
Polymers
Contamination
Polymerization

All Science Journal Classification (ASJC) codes

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

これを引用

Iwamoto, T., Doi, Y., Kinoshita, K., Ohta, Y., Takano, A., Takahashi, Y., ... Matsushita, Y. (2018). Conformations of Ring Polystyrenes in Bulk Studied by SANS. Macromolecules, 51(4), 1539-1548. https://doi.org/10.1021/acs.macromol.7b02358

Conformations of Ring Polystyrenes in Bulk Studied by SANS. / Iwamoto, Takuro; Doi, Yuya; Kinoshita, Keita; Ohta, Yutaka; Takano, Atsushi; Takahashi, Yoshiaki; Nagao, Michihiro; Matsushita, Yushu.

:: Macromolecules, 巻 51, 番号 4, 27.02.2018, p. 1539-1548.

研究成果: ジャーナルへの寄稿記事

Iwamoto, T, Doi, Y, Kinoshita, K, Ohta, Y, Takano, A, Takahashi, Y, Nagao, M & Matsushita, Y 2018, 'Conformations of Ring Polystyrenes in Bulk Studied by SANS', Macromolecules, 巻. 51, 番号 4, pp. 1539-1548. https://doi.org/10.1021/acs.macromol.7b02358
Iwamoto T, Doi Y, Kinoshita K, Ohta Y, Takano A, Takahashi Y その他. Conformations of Ring Polystyrenes in Bulk Studied by SANS. Macromolecules. 2018 2 27;51(4):1539-1548. https://doi.org/10.1021/acs.macromol.7b02358
Iwamoto, Takuro ; Doi, Yuya ; Kinoshita, Keita ; Ohta, Yutaka ; Takano, Atsushi ; Takahashi, Yoshiaki ; Nagao, Michihiro ; Matsushita, Yushu. / Conformations of Ring Polystyrenes in Bulk Studied by SANS. :: Macromolecules. 2018 ; 巻 51, 番号 4. pp. 1539-1548.
@article{3087bad260c540469dcfd12b4361f381,
title = "Conformations of Ring Polystyrenes in Bulk Studied by SANS",
abstract = "We prepared five pairs of hydrogenous and deuterated ring polystyrene samples over a wide range of molecular weights (10 kg/mol ≤ Mw ≤ 400 kg/mol) and investigated their chain conformations in bulk by small-angle neutron scattering (SANS) measurements. From the SANS profiles obtained, we estimated the radii of gyration Rg of the ring polymers by the Guinier approximation. Rg can be related to the degree of polymerization N as Rg ∼ N0.47. This scaling exponent ν = 0.47 ± 0.01 is evidently smaller than that for the Gaussian chains (ν = 0.50) but higher than previous experimental reports (ν = 0.42-0.43). Then our data were compared with various simulation and experimental data by introducing the entanglement degree of polymerization Ne for linear polymers as a normalized parameter. Rg of three smaller rings, i.e., R-10, R-30, and R-70, where the numbers denote molecular weights in kg/mol unit, are in good agreement with simulation results, while two larger rings, R-100 and R-400, exhibit higher Rg values than the simulations. Considering that the latter two higher molecular weight samples include maximum 3{\%} of linear contamination, their effects on chain dimension were calculated. As a result, it has been confirmed that 3{\%} of linear contaminations can overestimate Rg of rings as much as 6{\%} for R-100 and 12{\%} for R-400. Thus, Rg for pure large rings should be considerably lower than the present experimental values. We conclude Flory's exponent v in Rg ∼ Nv for rings may not be constant but rather show molecular weight dependence due to their topological constraint.",
author = "Takuro Iwamoto and Yuya Doi and Keita Kinoshita and Yutaka Ohta and Atsushi Takano and Yoshiaki Takahashi and Michihiro Nagao and Yushu Matsushita",
year = "2018",
month = "2",
day = "27",
doi = "10.1021/acs.macromol.7b02358",
language = "English",
volume = "51",
pages = "1539--1548",
journal = "Macromolecules",
issn = "0024-9297",
publisher = "American Chemical Society",
number = "4",

}

TY - JOUR

T1 - Conformations of Ring Polystyrenes in Bulk Studied by SANS

AU - Iwamoto, Takuro

AU - Doi, Yuya

AU - Kinoshita, Keita

AU - Ohta, Yutaka

AU - Takano, Atsushi

AU - Takahashi, Yoshiaki

AU - Nagao, Michihiro

AU - Matsushita, Yushu

PY - 2018/2/27

Y1 - 2018/2/27

N2 - We prepared five pairs of hydrogenous and deuterated ring polystyrene samples over a wide range of molecular weights (10 kg/mol ≤ Mw ≤ 400 kg/mol) and investigated their chain conformations in bulk by small-angle neutron scattering (SANS) measurements. From the SANS profiles obtained, we estimated the radii of gyration Rg of the ring polymers by the Guinier approximation. Rg can be related to the degree of polymerization N as Rg ∼ N0.47. This scaling exponent ν = 0.47 ± 0.01 is evidently smaller than that for the Gaussian chains (ν = 0.50) but higher than previous experimental reports (ν = 0.42-0.43). Then our data were compared with various simulation and experimental data by introducing the entanglement degree of polymerization Ne for linear polymers as a normalized parameter. Rg of three smaller rings, i.e., R-10, R-30, and R-70, where the numbers denote molecular weights in kg/mol unit, are in good agreement with simulation results, while two larger rings, R-100 and R-400, exhibit higher Rg values than the simulations. Considering that the latter two higher molecular weight samples include maximum 3% of linear contamination, their effects on chain dimension were calculated. As a result, it has been confirmed that 3% of linear contaminations can overestimate Rg of rings as much as 6% for R-100 and 12% for R-400. Thus, Rg for pure large rings should be considerably lower than the present experimental values. We conclude Flory's exponent v in Rg ∼ Nv for rings may not be constant but rather show molecular weight dependence due to their topological constraint.

AB - We prepared five pairs of hydrogenous and deuterated ring polystyrene samples over a wide range of molecular weights (10 kg/mol ≤ Mw ≤ 400 kg/mol) and investigated their chain conformations in bulk by small-angle neutron scattering (SANS) measurements. From the SANS profiles obtained, we estimated the radii of gyration Rg of the ring polymers by the Guinier approximation. Rg can be related to the degree of polymerization N as Rg ∼ N0.47. This scaling exponent ν = 0.47 ± 0.01 is evidently smaller than that for the Gaussian chains (ν = 0.50) but higher than previous experimental reports (ν = 0.42-0.43). Then our data were compared with various simulation and experimental data by introducing the entanglement degree of polymerization Ne for linear polymers as a normalized parameter. Rg of three smaller rings, i.e., R-10, R-30, and R-70, where the numbers denote molecular weights in kg/mol unit, are in good agreement with simulation results, while two larger rings, R-100 and R-400, exhibit higher Rg values than the simulations. Considering that the latter two higher molecular weight samples include maximum 3% of linear contamination, their effects on chain dimension were calculated. As a result, it has been confirmed that 3% of linear contaminations can overestimate Rg of rings as much as 6% for R-100 and 12% for R-400. Thus, Rg for pure large rings should be considerably lower than the present experimental values. We conclude Flory's exponent v in Rg ∼ Nv for rings may not be constant but rather show molecular weight dependence due to their topological constraint.

UR - http://www.scopus.com/inward/record.url?scp=85042704964&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85042704964&partnerID=8YFLogxK

U2 - 10.1021/acs.macromol.7b02358

DO - 10.1021/acs.macromol.7b02358

M3 - Article

AN - SCOPUS:85042704964

VL - 51

SP - 1539

EP - 1548

JO - Macromolecules

JF - Macromolecules

SN - 0024-9297

IS - 4

ER -