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Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
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Additive Manufacturing by Heating at a Patterned Photothermal Interface.

Chang-Uk Lee1, Kyle C H Chin2, Andrew J Boydston1,2,3

  • 1Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States.

ACS Applied Materials & Interfaces
|March 20, 2023
PubMed
Summary
This summary is machine-generated.

A new technology called heating at a patterned photothermal interface (HAPPI) enables direct additive manufacturing of commercial silicones. This innovation combines vat photopolymerization

Keywords:
3D printingadditive manufacturingphotothermal printingsiliconesthermoset resins

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Additive Manufacturing

Background:

  • Direct additive manufacturing (AM) of commercial silicones is a significant unmet need.
  • Existing AM methods often require chemical modification of silicone formulations.
  • Commercial silicones possess desirable material properties not easily replicated by current AM techniques.

Purpose of the Study:

  • To introduce a novel AM technology for unmodified commercial thermoset resins, specifically silicones.
  • To demonstrate the capability of HAPPI to produce silicone parts with properties comparable to injection-molded counterparts.
  • To showcase the versatility of HAPPI in targeted applications.

Main Methods:

  • Development of a novel heating at a patterned photothermal interface (HAPPI) technology.
  • Utilizing commercial polydimethylsiloxane (PDMS) resin (Sylgard 184) for HAPPI printing without chemical alteration.
  • Comparative analysis of material properties between HAPPI-printed and conventionally processed silicones.
  • Demonstration of HAPPI in specific application scenarios.

Main Results:

  • Successful implementation of HAPPI for direct AM of commercial silicone resins.
  • HAPPI integrates stereolithography's geometric control with thermally driven chemistry of silicones.
  • Achieved material properties in HAPPI-printed silicones comparable to injection-molded materials.
  • Demonstrated HAPPI's potential in targeted applications requiring precise silicone fabrication.

Conclusions:

  • HAPPI represents a breakthrough in additive manufacturing, enabling direct fabrication of commercial silicones.
  • The technology overcomes limitations of existing AM methods by avoiding chemical modifications.
  • HAPPI offers a pathway to combine advanced geometric freedom with the robust material characteristics of silicones.
  • This advancement holds significant promise for various industries requiring customized silicone components.