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Tough Multimaterial Interfaces through Wavelength-Selective 3D Printing.

Neil D Dolinski1,2, E Benjamin Callaway1, Caitlin S Sample1,2

  • 1Materials Department, University of California, Santa Barbara, Santa Barbara, California 93106, United States.

ACS Applied Materials & Interfaces
|April 30, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces wavelength-selective photocuring to create strong interfaces in 3D-printed multimaterial objects. This method enhances mechanical properties by forming interpenetrating polymer networks, improving additive manufacturing capabilities.

Keywords:
additive manufacturinginterfacesmultimaterialsphotochemistrypolymer networks

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Additive Manufacturing

Background:

  • Interfaces in synthetic materials are often weak points, unlike robust natural systems.
  • Developing strong interfaces between dissimilar materials is crucial for advanced material applications.

Purpose of the Study:

  • To develop a method for creating tough, well-defined interfaces between chemically distinct polymer domains.
  • To leverage wavelength-selective photocuring for enhanced mechanical properties in multimaterial 3D printing.

Main Methods:

  • Utilizing visible light with different wavelengths to trigger specific polymerization reactions (green light for acrylates, blue light for epoxies and acrylates).
  • Employing orthogonal cationic and radical polymerization processes initiated by distinct light wavelengths.
  • Characterizing interfaces using printed test structures, analyzing chemical composition, localized mechanical properties, and bulk fracture strength.

Main Results:

  • Successfully produced multimaterial objects with strong interfaces between chemically distinct domains.
  • Demonstrated that a continuous acrylate network bridging domains contributes to improved interface mechanical strength.
  • Validated the wavelength-selective photocuring approach through localized and bulk mechanical testing.

Conclusions:

  • Wavelength-selective photocuring of interpenetrating polymer networks is an effective strategy for enhancing interface strength in 3D-printed objects.
  • This technique offers a promising pathway for advancing light-based additive manufacturing technologies.
  • The ability to create robust interfaces opens new possibilities for designing complex multimaterial systems.