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

doi:10.1039/c1py00081k

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 journal › Article › peer-review

10 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 language	English
Pages (from-to)	1797-1802
Number of pages	6
Journal	Polymer Chemistry
Volume	2
Issue number	8
DOIs	https://doi.org/10.1039/c1py00081k
Publication status	Published - 2011 Aug
Externally published	Yes

ASJC Scopus subject areas

Bioengineering
Biochemistry
Polymers and Plastics
Organic Chemistry

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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.",

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

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T1 - Preparation and study of alkyl carbamylated polyrotaxanes with large hysteresis during sol-gel phase transition

AU - Li, Wei

AU - Guo, Yanli

AU - He, Peng

AU - Yang, Rong

AU - Li, Xingguo

AU - Chen, Ye

AU - Liang, Dehai

AU - Kidowaki, Masatoshi

AU - Ito, Kohzo

PY - 2011/8

Y1 - 2011/8

N2 - 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.

AB - 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.

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

Abstract

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