Please use this identifier to cite or link to this item:
Title: Sol–gel transitions of comb-like polymethacrylate copolymers by mechano-thermal stimuli in water
Authors: Jonnalagadda, Umesh Sai
Nguyen, Tuan Minh
Li, Feifei
Lee, Jim H. C.
Liu, Xu
Goto, Atsushi
Kwan, James J.
Keywords: Engineering::Chemical engineering
Issue Date: 2020
Source: Jonnalagadda, U. S., Nguyen, T. M., Li, F., Lee, J. H. C., Liu, X., Goto, A. & Kwan, J. J. (2020). Sol–gel transitions of comb-like polymethacrylate copolymers by mechano-thermal stimuli in water. Macromolecular Chemistry and Physics, 221(13), 2000088-.
Project: A1786a0029
Journal: Macromolecular Chemistry and Physics
Abstract: Sonogelation by supramolecular gelators is highlighted as a paradigm shift for their potential applications in material and biomedical sciences. Yet, these materials require organic solvents and low-frequency ultrasound, limiting their utility. Here, a comb-like polymethacrylate copolymer is synthesized with 2,6-bis(1-methylbenzimidazolyl)-4-oxypyridine tridentate ligand randomly distributed on poly(ethylene glycol) side chains. Upon addition of zinc perchlorate salt, this copolymer rapidly forms a hydrogel after exposure to either mechanical (i.e., ultrasound) or thermal stimuli. Spectroscopic analysis, to elucidate the mechanism, indicates metal ion coordination to ligand as well as the carbonyl and ethylene glycol units; interestingly, 1H-NMR suggests that the coordination between tridentate ligand moiety and Zn2+ is unexpectedly weaker in water than in acetonitrile. Investigations by dynamic light scattering indicates that the copolymer forms nanodispersions in excess salt, which coalesces to form a hydrogel by either heating or high intensity focused ultrasound (HIFU). Rheological quantification of these gels suggests stronger crosslinking by HIFU compared to heating.
ISSN: 1022-1352
DOI: 10.1002/macp.202000088
Schools: School of Chemical and Biomedical Engineering 
School of Physical and Mathematical Sciences 
Organisations: Institute of Chemical and Engineering Sciences, A*STAR
Rights: © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SCBE Journal Articles
SPMS Journal Articles

Citations 50

Updated on Jun 13, 2024

Web of ScienceTM
Citations 20

Updated on Oct 31, 2023

Page view(s)

Updated on Jun 15, 2024

Google ScholarTM




Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.