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

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

Research output: Contribution to conferencePaper

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
Pages3375-3376
Number of pages2
Publication statusPublished - 2005 Dec 1
Event54th SPSJ Symposium on Macromolecules - Yamagata, Japan
Duration: 2005 Sep 202005 Sep 22

Conference

Conference54th SPSJ Symposium on Macromolecules
CountryJapan
CityYamagata
Period05/9/2005/9/22

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Keywords

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

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Karino, T., Shibayama, M., Okumura, Y., Kidowak, M., Zhaqt, C., & Ito, K. (2005). The sol-gel transition of methylated polyrotaxane investigated by small angle neutron scattering. 3375-3376. Paper presented at 54th SPSJ Symposium on Macromolecules, Yamagata, Japan.