Gel formation mechanisms of thermo-sensitive polyrotaxane solutions

Toshiyuki Kataoka; Masatoshi Kidowaki; Takao Nakajima; Yohei Nagao; Zhao Changming; Kohzo Ito

Gel formation mechanisms of thermo-sensitive polyrotaxane solutions

Toshiyuki Kataoka, Masatoshi Kidowaki, Takao Nakajima, Yohei Nagao, Zhao Changming, Kohzo Ito

Research output: Contribution to conference › Paper › peer-review

Abstract

Thermoreversible hydrogels of the aqueous solutions of polyrotaxanes composed of polyethylene glycol and methylated α-CDs were investigated by DSC, X-ray diffraction, and rheological measurements. With increasing temperature, these aqueous solutions show sol to gel transition since hydrophobic interaction among α-CDs leads to aggregation of freely movable α-CDs on a PEG chain. These solutions have several kinds of gel formation mechanisms which strongly depend on the substitution ratio of methyl groups.

Original language	English
Number of pages	1
Publication status	Published - 2005 Dec 1
Externally published	Yes
Event	54th SPSJ Annual Meeting 2005 - Yokohama, Japan Duration: 2005 May 25 → 2005 May 27

Conference

Conference	54th SPSJ Annual Meeting 2005
Country	Japan
City	Yokohama
Period	05/5/25 → 05/5/27

Keywords

Cyclodextrins
Differential scanning calorimetry
Polyrotaxanes
Rheology
Slide-ring gels
Thermoreversible gels

ASJC Scopus subject areas

Engineering(all)

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title = "Gel formation mechanisms of thermo-sensitive polyrotaxane solutions",

abstract = "Thermoreversible hydrogels of the aqueous solutions of polyrotaxanes composed of polyethylene glycol and methylated α-CDs were investigated by DSC, X-ray diffraction, and rheological measurements. With increasing temperature, these aqueous solutions show sol to gel transition since hydrophobic interaction among α-CDs leads to aggregation of freely movable α-CDs on a PEG chain. These solutions have several kinds of gel formation mechanisms which strongly depend on the substitution ratio of methyl groups.",

keywords = "Cyclodextrins, Differential scanning calorimetry, Polyrotaxanes, Rheology, Slide-ring gels, Thermoreversible gels",

author = "Toshiyuki Kataoka and Masatoshi Kidowaki and Takao Nakajima and Yohei Nagao and Zhao Changming and Kohzo Ito",

year = "2005",

month = dec,

day = "1",

language = "English",

note = "54th SPSJ Annual Meeting 2005 ; Conference date: 25-05-2005 Through 27-05-2005",

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TY - CONF

T1 - Gel formation mechanisms of thermo-sensitive polyrotaxane solutions

AU - Kataoka, Toshiyuki

AU - Kidowaki, Masatoshi

AU - Nakajima, Takao

AU - Nagao, Yohei

AU - Changming, Zhao

AU - Ito, Kohzo

PY - 2005/12/1

Y1 - 2005/12/1

N2 - Thermoreversible hydrogels of the aqueous solutions of polyrotaxanes composed of polyethylene glycol and methylated α-CDs were investigated by DSC, X-ray diffraction, and rheological measurements. With increasing temperature, these aqueous solutions show sol to gel transition since hydrophobic interaction among α-CDs leads to aggregation of freely movable α-CDs on a PEG chain. These solutions have several kinds of gel formation mechanisms which strongly depend on the substitution ratio of methyl groups.

AB - Thermoreversible hydrogels of the aqueous solutions of polyrotaxanes composed of polyethylene glycol and methylated α-CDs were investigated by DSC, X-ray diffraction, and rheological measurements. With increasing temperature, these aqueous solutions show sol to gel transition since hydrophobic interaction among α-CDs leads to aggregation of freely movable α-CDs on a PEG chain. These solutions have several kinds of gel formation mechanisms which strongly depend on the substitution ratio of methyl groups.

KW - Cyclodextrins

KW - Differential scanning calorimetry

KW - Polyrotaxanes

KW - Rheology

KW - Slide-ring gels

KW - Thermoreversible gels

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M3 - Paper

AN - SCOPUS:33645579368

T2 - 54th SPSJ Annual Meeting 2005

Y2 - 25 May 2005 through 27 May 2005

ER -