Post-print UV curing method for improving the mechanical properties of prototypes derived from two-photon lithography

Area of Science:

• Materials Science
• Additive Manufacturing
• Polymer Chemistry

Background:

• Two photon polymerization (TPP) is a key technique for micro-scale 3D printing, offering high resolution.
• Acrylic resins are commonly used in TPP, but parts are often under-cured, limiting mechanical properties.
• Incomplete cross-linking reduces the modulus and ultimate strength of TPP-fabricated parts.

Purpose of the Study:

• To investigate post-print UV curing as a method to enhance the properties of TPP-derived structures.
• To improve the degree of cross-linking in partially cured acrylic resins used in TPP.
• To increase the mechanical performance of micro-scale 3D printed parts.

Main Methods:

• Utilizing UV-driven radical generation for post-print curing of TPP parts.
• Applying the curing technique to low-density, TPP-fabricated acrylic resin structures.
• Evaluating the increase in the overall degree of cross-linking.

Main Results:

• Post-print UV curing successfully increased the degree of cross-linking in TPP-derived structures.
• The enhanced cross-linking is attributed to UV-driven radical generation.
• This process offers a viable route to improve the mechanical properties of 3D printed parts.

Conclusions:

• Post-print UV curing is an effective method to enhance the cross-linking density of TPP parts.
• This technique can significantly improve the mechanical properties of micro-fabricated structures.
• UV-assisted post-curing provides a pathway to overcome limitations of TPP regarding material performance.