The sol-gel transition of methylated polyrotaxane investigated by small angle neutron scattering

Takeshi Karino, Mitsuhiro Shibayama, Yasushi Okumura, Masatoshi Kidowaki, Changming Zhaqt, Kohzo Ito

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Polyrotaxane (PR) is a kind of supramolecules, consisting of thread-like molecules of poly(ethylene glycol) (PEG) and α-cyclodextrin (CD) molecules. The PR is exclusively soluble in DMSO and alkali solutions due to the aggregation of CD molecules by hydrogen bonding between CDs. In order to avoid the aggregation of CD molecules and develop a new physical property, we synthesized methylated polyrotaxane (MPR) where the hydroxyl groups on CD were substituted by methyl groups. The methylated polyrotaxane is soluble in water, and exhibits a new function, i.e., temperature-sensitivity and sol-gel transition. Small angle neutron scattering (SANS) and dynamic light scattering (DLS) experiments were carried out to investigate the structure change as a function of temperature and the degree of methylation (DM). In low DM (≈ 30%), MPR did not show thermo-sensitivity. On the other hand, In high DM (≈ 80%), MPR showed strong temperature dependence. SANS intensity drastically increased at 60°C, and also a peak appeared. This change is consistent with the results of DLS. The origin of the thermo-sensitivity was found to be the hydrophobic interaction between methyl groups on CDs. j.

Original languageEnglish
Title of host publication54th SPSJ Symposium on Macromolecules - Polymer Preprints, Japan
Pages3375-3376
Number of pages2
Volume54
Edition2
Publication statusPublished - 2005
Externally publishedYes
Event54th SPSJ Symposium on Macromolecules - Yamagata
Duration: 2005 Sep 202005 Sep 22

Other

Other54th SPSJ Symposium on Macromolecules
CityYamagata
Period05/9/2005/9/22

Fingerprint

Cyclodextrins
Neutron scattering
Methylation
Sol-gels
Molecules
Dynamic light scattering
Polyethylene glycols
Agglomeration
Temperature
Hydrogen bonds
Physical properties
Water
Experiments

Keywords

  • DLS
  • Methylated polyrotaxane
  • SANS
  • Sol-gel transition

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Karino, T., Shibayama, M., Okumura, Y., Kidowaki, M., Zhaqt, C., & Ito, K. (2005). The sol-gel transition of methylated polyrotaxane investigated by small angle neutron scattering. In 54th SPSJ Symposium on Macromolecules - Polymer Preprints, Japan (2 ed., Vol. 54, pp. 3375-3376)

The sol-gel transition of methylated polyrotaxane investigated by small angle neutron scattering. / Karino, Takeshi; Shibayama, Mitsuhiro; Okumura, Yasushi; Kidowaki, Masatoshi; Zhaqt, Changming; Ito, Kohzo.

54th SPSJ Symposium on Macromolecules - Polymer Preprints, Japan. Vol. 54 2. ed. 2005. p. 3375-3376.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Karino, T, Shibayama, M, Okumura, Y, Kidowaki, M, Zhaqt, C & Ito, K 2005, The sol-gel transition of methylated polyrotaxane investigated by small angle neutron scattering. in 54th SPSJ Symposium on Macromolecules - Polymer Preprints, Japan. 2 edn, vol. 54, pp. 3375-3376, 54th SPSJ Symposium on Macromolecules, Yamagata, 05/9/20.
Karino T, Shibayama M, Okumura Y, Kidowaki M, Zhaqt C, Ito K. The sol-gel transition of methylated polyrotaxane investigated by small angle neutron scattering. In 54th SPSJ Symposium on Macromolecules - Polymer Preprints, Japan. 2 ed. Vol. 54. 2005. p. 3375-3376
Karino, Takeshi ; Shibayama, Mitsuhiro ; Okumura, Yasushi ; Kidowaki, Masatoshi ; Zhaqt, Changming ; Ito, Kohzo. / The sol-gel transition of methylated polyrotaxane investigated by small angle neutron scattering. 54th SPSJ Symposium on Macromolecules - Polymer Preprints, Japan. Vol. 54 2. ed. 2005. pp. 3375-3376
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