Preparation and study of alkyl carbamylated polyrotaxanes with large hysteresis during sol-gel phase transition

Wei Li, Yanli Guo, Peng He, Rong Yang, Xingguo Li, Ye Chen, Dehai Liang, Masatoshi Kidowaki, Kohzo Ito

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Ethyl carbamylated polyrotaxane (ECPR) and propyl carbamylated polyrotaxane (PCPR) were prepared based on the reactions between ethyl/propyl isocyanate and polyrotaxane (PR) in anhydrous DMSO under an argon atmosphere. By changing the alkyl type and substitution ratio, the PR derivative with good water-solubility was obtained and its solutions showed reversible sol-gel phase transition. During the heating process, transition temperature from sol to gel decreased from 32 °C to 18 °C with increasing the solution concentration from 2.44% to 13.5%, while in the cooling process, all the gels with various concentration did not turn into sols until the temperature decreased to 1 °C, exhibiting large hysteresis between heating and cooling.

Original languageEnglish
Pages (from-to)1797-1802
Number of pages6
JournalPolymer Chemistry
Volume2
Issue number8
DOIs
Publication statusPublished - 2011 Aug
Externally publishedYes

Fingerprint

Rotaxanes
Sols
Sol-gels
Hysteresis
Gels
Phase transitions
Cooling
Industrial heating
Polymethyl Methacrylate
Superconducting transition temperature
Argon
Substitution reactions
Solubility
Derivatives
Heating
Isocyanates
Dimethyl Sulfoxide
Water
Temperature
polyrotaxane

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Biochemistry
  • Biomedical Engineering
  • Bioengineering

Cite this

Preparation and study of alkyl carbamylated polyrotaxanes with large hysteresis during sol-gel phase transition. / Li, Wei; Guo, Yanli; He, Peng; Yang, Rong; Li, Xingguo; Chen, Ye; Liang, Dehai; Kidowaki, Masatoshi; Ito, Kohzo.

In: Polymer Chemistry, Vol. 2, No. 8, 08.2011, p. 1797-1802.

Research output: Contribution to journalArticle

Li, Wei ; Guo, Yanli ; He, Peng ; Yang, Rong ; Li, Xingguo ; Chen, Ye ; Liang, Dehai ; Kidowaki, Masatoshi ; Ito, Kohzo. / Preparation and study of alkyl carbamylated polyrotaxanes with large hysteresis during sol-gel phase transition. In: Polymer Chemistry. 2011 ; Vol. 2, No. 8. pp. 1797-1802.
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AU - Chen, Ye

AU - Liang, Dehai

AU - Kidowaki, Masatoshi

AU - Ito, Kohzo

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