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Sulfobetaine-based polydisulfides with tunable upper critical solution temperature (UCST) in water alcohols mixture, depolymerization kinetics and surface wettability.

Authors
  • Kollár, Jozef1
  • Popelka, Anton2
  • Tkac, Jan3
  • Žabka, Matej4
  • Mosnáček, Jaroslav5
  • Kasak, Peter6
  • 1 Center for Advanced Materials, Qatar University, P.O. Box 2713, Doha, Qatar; Polymer Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 845 41 Bratislava, Slovak Republic. , (Qatar)
  • 2 Center for Advanced Materials, Qatar University, P.O. Box 2713, Doha, Qatar. , (Qatar)
  • 3 Institute of Chemistry, Slovak Academy of Sciences, Dubravska cesta 9, Bratislava 845 38, Slovak Republic.
  • 4 Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovak Republic.
  • 5 Polymer Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 845 41 Bratislava, Slovak Republic; Centre for Advanced Materials Application, Slovak Academy of Sciences, Dubravska cesta 9, 845 11 Bratislava, Slovak Republic.
  • 6 Center for Advanced Materials, Qatar University, P.O. Box 2713, Doha, Qatar. Electronic address: [email protected] , (Qatar)
Type
Published Article
Journal
Journal of Colloid and Interface Science
Publisher
Elsevier
Publication Date
Apr 15, 2021
Volume
588
Pages
196–208
Identifiers
DOI: 10.1016/j.jcis.2020.12.048
PMID: 33387822
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Synthesis of a new family of polymers having a polydisulfide structure can be conducted from sulfobetaine-based derivative of natural (R)-lipoic acid. A polydisulfide backbone of polymer can be depolymerized by response to external stimuli and sulfobetaine pendant groups ensure the upper critical solution temperature (UCST) behaviour temperatures that can be modulated according to the nature of the solvent and concentration. Sulfobetaine-bearing polydisulfides were synthesized from dithiolane derivatives and then characterized. UCST behavior of the polymers in water and in mixtures containing different alcohols (methanol, ethanol, isopropanol) was investigated. The regeneration of monomers from the polymers in response to external stimuli was examined using UV-vis and circular dichroism (CD) spectroscopy. Tunable surface wettability were shown on the grafted polymers. Decreasing polarity and/or increasing alcohol percentage in the water mixtures induced an increase in the cloud points of the polymers in the solutions. Thermoresponsive behaviour were repeatable and fully reversible with negligible hysteresis from aggregate to unimer state. The regeneration of monomers by depolymerization was tunable by temperature and sunlight. A thickness dependence on surface wettability was observed on wafers covalently modified with polydisulfides. This is the first report of sulfobetaine-based polydisulfides showing tunable UCST behavior and surface wettability. Copyright © 2021 The Authors. Published by Elsevier Inc. All rights reserved.

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