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PEGylated PNiPAM Microgels : Synthesis, Characterization and Colloidal Stability

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 (mDSC), 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.
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Submitted on : Saturday, December 29, 2018 - 5:14:14 PM
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Julien Es Sayed, Cédric Lorthioir, Patrick Perrin, Nicolas Sanson. PEGylated PNiPAM Microgels : Synthesis, Characterization and Colloidal Stability. Soft Matter, Royal Society of Chemistry, 2019, 15, pp.963-972. ⟨10.1039/c8sm02156b⟩. ⟨hal-01966786⟩

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