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Issue 80, 2015
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Synthesis and properties of tunable thermoresponsive aliphatic polycarbonate copolymers with oligo ethylene glycol containing thioether and/or sulphone groups

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Abstract

A series of novel thermoresponsive copolycarbonates were constructed by cyclic trimethylene carbonate (MTC) monomers bearing oligo ethylene glycol (OEG) and with thioether or/and sulphone linkages. They were initiated by 1,4-benzenedimethanol with N-(3,5-trifluoromethyl)phenyl-N′-cyclohexylthiourea (TU)/1,8-diazabicyclo[5,4,0]undec-7-ene (DBU) as the organic catalyst. The lower critical solution temperature (LCST) properties of the polycarbonates with thioether or sulphone linkage were studied and discussed with regard to molecular weight, salt concentration and polymer concentration. By using monomers of different OEG chain lengths and thioether and/or sulphone linkages, the LCSTs of biodegradable and thermoresponsive polycarbonate copolymers can be easily tuned within a wide temperature window from 0 °C to 46 °C (3 g L−1 in aqueous solution). In addition, block polycarbonates with two tunable LCSTs were further synthesized and investigated. Results showed that LCST1 was constructed by polycarbonate with a hydrophobic thioether linkage, while the LCST2 was achieved by a polycarbonate containing hydrophilic sulphone linkage.

Graphical abstract: Synthesis and properties of tunable thermoresponsive aliphatic polycarbonate copolymers with oligo ethylene glycol containing thioether and/or sulphone groups

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Supplementary files

Article information


Submitted
03 Jun 2015
Accepted
21 Jul 2015
First published
22 Jul 2015

RSC Adv., 2015,5, 64832-64840
Article type
Paper
Author version available

Synthesis and properties of tunable thermoresponsive aliphatic polycarbonate copolymers with oligo ethylene glycol containing thioether and/or sulphone groups

L. Yu, Z. Zheng, Y. Liu, Z. Li and X. Wang, RSC Adv., 2015, 5, 64832
DOI: 10.1039/C5RA10486F

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