Anomaly in stretching-induced swelling of slide-ring gels with movable cross-links

Naoki Murata; Akihiro Konda; Kenji Urayama; Toshikazu Takigawa; Masatoshi Kidowaki; Kohzo Ito

doi:10.1021/ma901661d

Anomaly in stretching-induced swelling of slide-ring gels with movable cross-links

Naoki Murata, Akihiro Konda, Kenji Urayama, Toshikazu Takigawa, Masatoshi Kidowaki, Kohzo Ito

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

39 Citations (Scopus)

Abstract

Stretching-induced swelling is investigated for polyrotaxane (PR)-based slide-ring gels with movable cross-links. The osmotic Poisson's ratio (μ_OS), which is a measure of strain-induced swelling, is examined as a function of imposed stretching (α_x) for three types of PR gels with various degrees of the mobility of sliderings. Classical gels with topologically fixed cross-links and PR gels with constrained slide-rings exhibit α_x-independent μ_0S. In contrast, PR gels with highly mobile slide-rings exhibit α_x-dependent μ_0S. The μ_0S increases with α_x in the case of moderate stretching (α_x < 1.5), whereas it levels off in the case of high stretching (α_x > 1.5). An increase in μ_0S with elongation results from the molecular pulley effect of slide-rings that homogenizes the structure of deformed networks. The pulley effect suppresses the stretching-induced swelling that originates from an entropie force to reduce the configurational anisotropy of the deformed networks.

Original language	English
Pages (from-to)	8485-8491
Number of pages	7
Journal	Macromolecules
Volume	42
Issue number	21
DOIs	https://doi.org/10.1021/ma901661d
Publication status	Published - 2009 Nov 10

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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title = "Anomaly in stretching-induced swelling of slide-ring gels with movable cross-links",

abstract = "Stretching-induced swelling is investigated for polyrotaxane (PR)-based slide-ring gels with movable cross-links. The osmotic Poisson's ratio (μOS), which is a measure of strain-induced swelling, is examined as a function of imposed stretching (αx) for three types of PR gels with various degrees of the mobility of sliderings. Classical gels with topologically fixed cross-links and PR gels with constrained slide-rings exhibit αx-independent μ0S. In contrast, PR gels with highly mobile slide-rings exhibit αx-dependent μ0S. The μ0S increases with αx in the case of moderate stretching (αx < 1.5), whereas it levels off in the case of high stretching (αx > 1.5). An increase in μ0S with elongation results from the molecular pulley effect of slide-rings that homogenizes the structure of deformed networks. The pulley effect suppresses the stretching-induced swelling that originates from an entropie force to reduce the configurational anisotropy of the deformed networks.",

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T1 - Anomaly in stretching-induced swelling of slide-ring gels with movable cross-links

AU - Murata, Naoki

AU - Konda, Akihiro

AU - Urayama, Kenji

AU - Takigawa, Toshikazu

AU - Kidowaki, Masatoshi

AU - Ito, Kohzo

PY - 2009/11/10

Y1 - 2009/11/10

N2 - Stretching-induced swelling is investigated for polyrotaxane (PR)-based slide-ring gels with movable cross-links. The osmotic Poisson's ratio (μOS), which is a measure of strain-induced swelling, is examined as a function of imposed stretching (αx) for three types of PR gels with various degrees of the mobility of sliderings. Classical gels with topologically fixed cross-links and PR gels with constrained slide-rings exhibit αx-independent μ0S. In contrast, PR gels with highly mobile slide-rings exhibit αx-dependent μ0S. The μ0S increases with αx in the case of moderate stretching (αx < 1.5), whereas it levels off in the case of high stretching (αx > 1.5). An increase in μ0S with elongation results from the molecular pulley effect of slide-rings that homogenizes the structure of deformed networks. The pulley effect suppresses the stretching-induced swelling that originates from an entropie force to reduce the configurational anisotropy of the deformed networks.

AB - Stretching-induced swelling is investigated for polyrotaxane (PR)-based slide-ring gels with movable cross-links. The osmotic Poisson's ratio (μOS), which is a measure of strain-induced swelling, is examined as a function of imposed stretching (αx) for three types of PR gels with various degrees of the mobility of sliderings. Classical gels with topologically fixed cross-links and PR gels with constrained slide-rings exhibit αx-independent μ0S. In contrast, PR gels with highly mobile slide-rings exhibit αx-dependent μ0S. The μ0S increases with αx in the case of moderate stretching (αx < 1.5), whereas it levels off in the case of high stretching (αx > 1.5). An increase in μ0S with elongation results from the molecular pulley effect of slide-rings that homogenizes the structure of deformed networks. The pulley effect suppresses the stretching-induced swelling that originates from an entropie force to reduce the configurational anisotropy of the deformed networks.

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ER -

Anomaly in stretching-induced swelling of slide-ring gels with movable cross-links

Abstract

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