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Reversible Thermochromic Microcapsules and Their Applications in Anticounterfeiting.

Haisheng Liu1, Yuhao Deng2, Yang Ye2

  • 1School of Physics and Electronics, Hunan University, Changsha 410082, China.

Materials (Basel, Switzerland)
|July 29, 2023
PubMed
Summary

Researchers developed novel, formaldehyde-free reversible thermochromic (RT) poly(urethane-urea) microcapsules. These safer RT microcapsules offer potential for anticounterfeiting applications, replacing harmful traditional melamine-formaldehyde resins.

Keywords:
anticounterfeitingcoatingmicrocapsulepoly(urethane-urea)reversible thermochromicscreen-printing ink

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Commercial reversible thermochromic (RT) microcapsules often use melamine-formaldehyde resin, posing health risks due to formaldehyde content.
  • Development of safer, formaldehyde-free alternatives is crucial for widespread application.

Purpose of the Study:

  • To synthesize novel formaldehyde-free RT microcapsules using poly(urethane-urea) (PUU) as the shell material.
  • To optimize the microcapsule synthesis process and characterize their properties for anticounterfeiting applications.

Main Methods:

  • Interfacial polymerization was used to create PUU-encapsulated RT microcapsules with crystal violet lactone, bisphenol AF, and methyl stearate core.
  • An L9(34) orthogonal design and single-factor experiments optimized synthesis parameters like shear rate and material ratios.
  • Characterization included particle size analysis, morphology, thermal stability, and resistance tests.

Main Results:

  • Optimal synthesis involved a shear rate of 2500 rpm, N3300-to-L75 ratio of 1:4, core-to-shell ratio of 11:5, and 3.5% emulsifier concentration.
  • The study detailed the influence of shear rate on microcapsule properties, including particle size, morphology, and thermochromic behavior.
  • The fabricated RT-PUU microcapsules demonstrated suitability for creating reversible thermochromic marks for anticounterfeiting.

Conclusions:

  • Novel formaldehyde-free RT-PUU microcapsules were successfully synthesized and optimized.
  • These microcapsules exhibit desirable properties for anticounterfeiting and offer a safer alternative to existing technologies.
  • The developed microcapsules show potential for practical application in security features and anti-falsification.