Polymer particle-based micromolding to fabricate novel microstructures.

Area of Science:

• Materials Science and Engineering
• Biomedical Engineering
• Polymer Science

Background:

• Conventional micromolding techniques face limitations in fabricating intricate polymer microstructures.
• There is a need for versatile micromolding methods capable of producing complex geometries and multi-material constructs.

Purpose of the Study:

• To develop and demonstrate a novel polymer particle-based micromolding technique.
• To produce microstructures with complex geometries, multi-material compositions, and encapsulated compounds using mild processing conditions.

Main Methods:

• Fabrication of polymer microparticles (PLA, PGA, PLGA) via spray drying and emulsion techniques, with optional drug encapsulation.
• Filling of microparticles into PDMS micromolds at room temperature, followed by melting or bonding (e.g., ultrasonic welding) to form microstructures.
• Development of protocols for porous, multi-layered, and complex arrowhead microstructures, including microneedle fabrication.

Main Results:

• Successfully fabricated porous, multi-layered, and complex arrowhead microstructures using polymer microparticles.
• Demonstrated encapsulation of model drug compounds within the microstructures.
• Developed multi-layer microneedles capable of insertion into tissue, controlled drug release, and detachment for embedded delivery.

Conclusions:

• Polymer particle-based micromolding offers a versatile platform for fabricating microstructures with diverse materials and complex designs.
• This technique allows for mild processing conditions and effective encapsulation of active compounds.
• The developed microneedles show promise for advanced drug delivery applications.