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Synthesis of PolyN-isopropylacrylamide Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability
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Core-shell microgels synthesized in continuous flow: deep insight into shell growth using temperature-dependent FTIR.

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|July 17, 2022
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Summary

Understanding core-shell microgel shell formation is key for customization. This study reveals an interpenetrated network forms early, influencing swelling properties and transition temperatures in N-isopropylmethacrylamide and N-n-propylacrylamide microgels.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Core-shell microgels are widely studied, but their shell formation mechanisms remain unclear.
  • Understanding shell formation is crucial for tailoring microgel properties for specific applications.
  • Previous research has not fully elucidated the early stages of shell development in precipitation polymerization.

Purpose of the Study:

  • To investigate the formation mechanism of N-n-propylacrylamide (NnPAM) shells on N-isopropylmethacrylamide (NiPMAM) microgel cores.
  • To determine how residence time in a continuous flow reactor affects shell growth and microgel properties.
  • To elucidate the relationship between shell structure and swelling behavior.

Main Methods:

  • Synthesis of NiPMAM core/NnPAM shell microgels in a continuous flow reactor.
  • Photon Correlation Spectroscopy (PCS) to measure volume phase transition temperatures (VPTTs).
  • Temperature-dependent Fourier Transform Infrared (FTIR) spectroscopy to analyze network interactions.
  • Atomic Force Microscopy (AFM) to visualize shell morphology and distribution.

Main Results:

  • Increasing residence time decreased VPTTs of both core and shell.
  • Early stages showed reduced swelling capacity due to a pronounced interpenetrated network (IPN) between NiPMAM and NnPAM.
  • AFM revealed heterogeneous NnPAM distribution at early stages, indicating domain aggregation before distinct shell formation.
  • Vibrational spectroscopy and diffusional properties confirmed a deeply interpenetrated network from the onset of polymerization.

Conclusions:

  • The shell formation is characterized by a significant interpenetration of NnPAM within the NiPMAM core from early stages.
  • The degree of interpenetration directly impacts the microgel's swelling properties and transition temperatures.
  • Continuous flow synthesis allows for controlled formation of interpenetrated core-shell microgels, offering tunable properties.