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Issue 5, 2019
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PEGylated NiPAM microgels: synthesis, characterization and colloidal stability

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Abstract

The objective of this work is to synthesize highly stable thermoresponsive microgels that could be used in diverse applications. To achieve this, N-isopropylacrylamide (NiPAM) based microgels were first synthesized by surfactant-free precipitation polymerization of NiPAM in the presence of poly(ethylene glycol)methacrylate (PEG) as a macro-comonomer and methylenebisacrylamide (MBA) as a chemical crosslinker. By combining a complete set of techniques such as dynamic light scattering (DLS), scanning electron microscopy (SEM), zetametry, 1H NMR and micro-differential scanning calorimetry (μDSC), we clearly demonstrate that (i) the incorporation of the PEG chains controls the size and the polydispersity of the NiPAM-based microgels, whereas the thermal behavior in solution (enthalpy, volume phase transition temperature (VPTT)) remains almost the same as for pure NiPAM microgels; (ii) the PEG chains are mainly located on the microgel periphery; and (iii) the presence of the PEG chains strongly increases the colloidal stability of microgels in electrolyte solutions at high temperatures.

Graphical abstract: PEGylated NiPAM microgels: synthesis, characterization and colloidal stability

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Supplementary files

Article information


Submitted
23 Oct 2018
Accepted
24 Dec 2018
First published
27 Dec 2018

Soft Matter, 2019,15, 963-972
Article type
Paper

PEGylated NiPAM microgels: synthesis, characterization and colloidal stability

J. Es Sayed, C. Lorthioir, P. Perrin and N. Sanson, Soft Matter, 2019, 15, 963
DOI: 10.1039/C8SM02156B

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