Volume phase transitions of slide-ring gels

Akinori Bando; Rumiko Kasahara; Kentaro Kayashima; Yasushi Okumura; Kazuaki Kato; Yasuhiro Sakai; Hideaki Yokoyama; Yuya Shinohara; Yoshiyuki Amemiya; Kohzo Ito

doi:10.3390/polym8060217

Volume phase transitions of slide-ring gels

Akinori Bando, Rumiko Kasahara, Kentaro Kayashima, Yasushi Okumura, Kazuaki Kato, Yasuhiro Sakai, Hideaki Yokoyama, Yuya Shinohara, Yoshiyuki Amemiya, Kohzo Ito

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

6 Scopus citations

Abstract

The volume phase transition of slide-ring gels with freely-movable cross-linking junctions was investigated. Ionic chemical gels with fixed cross-linking junctions undergo volume phase transitions when they have higher than the critical degree of ionization. However, the experimentally-observed critical ionization value for slide-ring gels is much higher than theoretical values for chemical gels. This difference indicates that the volume phase transition is significantly suppressed in slide-ring gels. The mesoscale structure at various swollen or shrunken states was also investigated by small angle X-ray scattering. Changes in the scattering patterns with shrinking slide-ring gels suggest microphase separation due to the sliding of cyclic molecules threaded along the axis of the polymer chains, which may suppress the volume phase transition. In addition, slide-ring gels absorbed/desorbed greater than equilibrium volumes in the shrinking/swelling processes and showed slow dynamics; these observations are also related to their sliding properties.

Original language	English
Article number	217
Journal	Polymers
Volume	8
Issue number	6
DOIs	https://doi.org/10.3390/polym8060217
State	Published - Jun 3 2016
Externally published	Yes

Keywords

Polyrotaxane
Slide-ring gel
Small-angle X-ray scattering
Volume phase transition

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10.3390/polym8060217

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title = "Volume phase transitions of slide-ring gels",

abstract = "The volume phase transition of slide-ring gels with freely-movable cross-linking junctions was investigated. Ionic chemical gels with fixed cross-linking junctions undergo volume phase transitions when they have higher than the critical degree of ionization. However, the experimentally-observed critical ionization value for slide-ring gels is much higher than theoretical values for chemical gels. This difference indicates that the volume phase transition is significantly suppressed in slide-ring gels. The mesoscale structure at various swollen or shrunken states was also investigated by small angle X-ray scattering. Changes in the scattering patterns with shrinking slide-ring gels suggest microphase separation due to the sliding of cyclic molecules threaded along the axis of the polymer chains, which may suppress the volume phase transition. In addition, slide-ring gels absorbed/desorbed greater than equilibrium volumes in the shrinking/swelling processes and showed slow dynamics; these observations are also related to their sliding properties.",

keywords = "Polyrotaxane, Slide-ring gel, Small-angle X-ray scattering, Volume phase transition",

author = "Akinori Bando and Rumiko Kasahara and Kentaro Kayashima and Yasushi Okumura and Kazuaki Kato and Yasuhiro Sakai and Hideaki Yokoyama and Yuya Shinohara and Yoshiyuki Amemiya and Kohzo Ito",

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doi = "10.3390/polym8060217",

language = "English",

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T1 - Volume phase transitions of slide-ring gels

AU - Bando, Akinori

AU - Kasahara, Rumiko

AU - Kayashima, Kentaro

AU - Okumura, Yasushi

AU - Kato, Kazuaki

AU - Sakai, Yasuhiro

AU - Yokoyama, Hideaki

AU - Shinohara, Yuya

AU - Amemiya, Yoshiyuki

AU - Ito, Kohzo

PY - 2016/6/3

Y1 - 2016/6/3

N2 - The volume phase transition of slide-ring gels with freely-movable cross-linking junctions was investigated. Ionic chemical gels with fixed cross-linking junctions undergo volume phase transitions when they have higher than the critical degree of ionization. However, the experimentally-observed critical ionization value for slide-ring gels is much higher than theoretical values for chemical gels. This difference indicates that the volume phase transition is significantly suppressed in slide-ring gels. The mesoscale structure at various swollen or shrunken states was also investigated by small angle X-ray scattering. Changes in the scattering patterns with shrinking slide-ring gels suggest microphase separation due to the sliding of cyclic molecules threaded along the axis of the polymer chains, which may suppress the volume phase transition. In addition, slide-ring gels absorbed/desorbed greater than equilibrium volumes in the shrinking/swelling processes and showed slow dynamics; these observations are also related to their sliding properties.

AB - The volume phase transition of slide-ring gels with freely-movable cross-linking junctions was investigated. Ionic chemical gels with fixed cross-linking junctions undergo volume phase transitions when they have higher than the critical degree of ionization. However, the experimentally-observed critical ionization value for slide-ring gels is much higher than theoretical values for chemical gels. This difference indicates that the volume phase transition is significantly suppressed in slide-ring gels. The mesoscale structure at various swollen or shrunken states was also investigated by small angle X-ray scattering. Changes in the scattering patterns with shrinking slide-ring gels suggest microphase separation due to the sliding of cyclic molecules threaded along the axis of the polymer chains, which may suppress the volume phase transition. In addition, slide-ring gels absorbed/desorbed greater than equilibrium volumes in the shrinking/swelling processes and showed slow dynamics; these observations are also related to their sliding properties.

KW - Polyrotaxane

KW - Slide-ring gel

KW - Small-angle X-ray scattering

KW - Volume phase transition

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DO - 10.3390/polym8060217

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AN - SCOPUS:84976486780

SN - 2073-4360

VL - 8

JO - Polymers

JF - Polymers

IS - 6

M1 - 217

ER -

Volume phase transitions of slide-ring gels

Abstract

Keywords

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