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Developing Hydration Maps of Polymer Latex Film Formation Using Terahertz Time-Domain Spectroscopy.

Gonçalo Costa1, Emily M Brogden2, Jacob J Young1

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Terahertz time-domain spectroscopy (THz-TDS) offers new insights into polymer latex drying. This method maps hydration in 2D, complementing existing techniques for better understanding film formation.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Spectroscopy

Background:

  • Drying dynamics of polymer latexes significantly impact final film properties.
  • Existing methods like gravimetric analysis, GARField-NMR, and OCT provide limited spatial information.
  • A technique offering in-plane (xy) structural and spectroscopic data is needed.

Purpose of the Study:

  • To investigate the drying and film formation process of various polymer latexes.
  • To demonstrate the utility of Terahertz time-domain spectroscopy (THz-TDS) in studying these dynamics.
  • To obtain 2D hydration maps of drying latex dispersions.

Main Methods:

  • Utilized Terahertz time-domain spectroscopy (THz-TDS) to monitor latex drying.
  • Studied various polymer latexes with different glass transition temperatures.
  • Developed latex-dependent calibration lines for creating 2D hydration maps.

Main Results:

  • THz-TDS successfully provided structural and spectroscopic information in the xy-plane.
  • Generated 2D parallel hydration maps of drying latex droplets.
  • Observed known phenomena associated with the drying of colloidal dispersions.

Conclusions:

  • THz-TDS is a valuable addition to the study of polymer latex drying dynamics.
  • The technique fills a geometric gap by providing in-plane information.
  • This method enhances the understanding of polymer film formation and properties.