Synthesis, Characterization and Application of PNIPAM and PNIPAM-PEI Microgels as Emulsifiers in Pickering Emulsions

LI Minghao, WANG Ling, XU Yuanhang, ZHANG Shuai, LI Kexin, LI Jiaxi, SHI Shan

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Plastics Science and Technology ›› 2025, Vol. 53 ›› Issue (01) : 103-108. DOI: 10.15925/j.cnki.issn1005-3360.2025.01.019
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Synthesis, Characterization and Application of PNIPAM and PNIPAM-PEI Microgels as Emulsifiers in Pickering Emulsions

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Abstract

Poly(N-isopropylacrylamide) (PNIPAM) microgels were prepared by soap-free emulsion polymerization. Then, PNIPAM-PEI microgels were synthesized by seed soap-free emulsion polymerization with PNIPAM microgels as seeds, N-isopropylacrylamide (NIPAM) and polyethyleneimine (PEI) as second monomers, and tert-butyl hydrogen peroxide as initiator. The obtained microgels were characterized in detail by Fourier transform infrared spectroscopy, nuclear magnetic resonance hydrogen spectrum, transmission electron microscopy and dynamic light scattering, and the feasibility of its use as an emulsifier to form stable pickling emulsions was discussed. PNIPAM and PNIPAM-PEI microgels were submicron spheres with uniform particle size distribution and good dispersion stability. Both microgels showed obvious temperature responsiveness, with volume phase transformation temperatures of 32.9, 34.8 ℃, respectively. In addition, the fluid particle size of PNIPAM-PEI microgels decreased with the increase of pH value, showing significant pH responsiveness. With 1% PNIPAM and PNIPAM-PEI microgel water dispersions as water phase and toluene as oil phase, the two microgels formed homogeneous and stable O/W pickling emulsions when the oil-water volume ratio was 8∶4 and 7∶5, respectively, and the emulsions formed showed certain environmental responsiveness.

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Poly-N-isopropylacrylamide / Microgel / Environmental responsiveness / Pickering emulsion / Emulsifier

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LI Minghao , WANG Ling , XU Yuanhang , et al . Synthesis, Characterization and Application of PNIPAM and PNIPAM-PEI Microgels as Emulsifiers in Pickering Emulsions. Plastics Science and Technology. 2025, 53(01): 103-108 https://doi.org/10.15925/j.cnki.issn1005-3360.2025.01.019

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