Issue 8, 2011
From the journal:

Polymer Chemistry

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

Wei Li,a   Yanli Guo,*a   Peng He,a   Rong Yang,a   Xingguo Li,*a   Ye Chen,a   Dehai Liang,a   Masatoshi Kidowakib  and  Kohzo Itob  

* Corresponding authors

a Beijing National Laboratory for Molecular Sciences (BNLMS), (The State Key Laboratory of Rare Earth Materials Chemistry and Applications), College of Chemistry and Molecular Engineering, Peking University, Beijing, China
E-mail: xgli@pku.edu.cn
Tel: +86 010 62765930

b Department of Advanced Materials Science, Graduate School of Frontier Sciences, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-City, Chiba, Japan

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.

Graphical abstract: Preparation and study of alkyl carbamylated polyrotaxanes with large hysteresis during sol–gel phase transition

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Article information

DOI
https://doi.org/10.1039/C1PY00081K
Article type
Paper
Submitted
20 Feb 2011
Accepted
20 Apr 2011
First published
06 May 2011

Polym. Chem., 2011,2, 1797-1802

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

W. Li, Y. Guo, P. He, R. Yang, X. Li, Y. Chen, D. Liang, M. Kidowaki and K. Ito, Polym. Chem., 2011, 2, 1797 DOI: 10.1039/C1PY00081K

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