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Tuning CO2-induced reversible redispersion or irreversible destabilisation for latex separation.

Meng Mu1, Rui Yuan2, Ganghong Zhang2

  • 1Polymer Research Institute, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, PR China; Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, PR China.

Journal of Colloid and Interface Science
|April 13, 2020
PubMed
Summary

This study introduces a new method for creating CO2-responsive polymer latexes, enabling tunable dispersion and coagulation for easier material processing. This advance simplifies latex preparation and offers new applications in material separation and transport.

Keywords:
CO(2)-switchableDispersion/coagulation transitionElectrostatic interactionPolymer colloidsSwelling/deswelling transition

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Area of Science:

  • Polymer Science
  • Materials Chemistry
  • Colloid Science

Background:

  • Responsive polymer latexes offer convenient bulk material acquisition via CO2-induced transitions.
  • Existing methods for switchable surfactants and sensitive latexes have limitations in synthesis and operation.
  • A maneuverable strategy for tunable CO2-responsive latexes is needed.

Purpose of the Study:

  • To develop a new strategy for generating latexes with tunable CO2 responsiveness.
  • To introduce CO2-switchable electrostatic interactions for constructing responsive latexes.
  • To investigate the influence of polymer composition on CO2 responsiveness.

Main Methods:

  • Fabrication of poly(diethylaminoethyl methacrylate-styrene) [P(DEA-St)] latexes via one-pot emulsion copolymerization.
  • Utilized divinylbenzene as a crosslinker and sodium dodecylsulfate (SDS) as an anionic emulsifier.
  • Characterized P(DEA-St) colloids using Fourier transform infrared spectroscopy and scanning electron microscopy.
  • Verified response transitions through cyclic CO2/N2 input.

Main Results:

  • Morphology of copolymerized nanoparticles transitioned from ambiguous bulge to spherical with decreasing DEA ratio.
  • P(DEA-St) latexes exhibited four CO2/N2 response modes: swelling/deswelling, dispersion/coagulation, irreversible destabilization, and insensitivity.
  • CO2-responsive destabilization showed high applicability in separating and transporting commercial latex products.

Conclusions:

  • A novel, maneuverable strategy for creating CO2-responsive latexes was successfully developed.
  • The tunable CO2-switchable electrostatic interaction provides control over latex properties.
  • The findings have significant implications for the separation and transportation of polymer latex products.