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Biocompatible polymers with tunable mechanical properties and conductive functionality on two-photon 3D printing.

Lijun Men1, Kemin Wang1,2, Ningning Hu1

  • 1Shanghai University, School of Mechanical and Electrical Engineering No. 99, Shangda Road, Baoshan District Shanghai China.

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Summary

This study introduces novel polymer formulas for two-photon polymerization (TPP) 3D printing, offering tunable mechanical properties and enhanced functionality for biodevices. These materials overcome limitations of existing photoresists, enabling high-resolution, flexible, and biocompatible micro- and nano-scale structures.

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Area of Science:

  • Materials Science
  • Biotechnology
  • Additive Manufacturing

Background:

  • Two-photon polymerization (TPP) enables high-resolution 3D printing for bio-related applications like tissue engineering and drug delivery.
  • Existing TPP photoresists lack mechanical tunability and functional doping capabilities, limiting biodevice development.

Purpose of the Study:

  • To develop TPP-printable polymer formulas with tunable mechanical properties, high resolution, and functional scalability.
  • To address the limitations of existing photosensitive materials in balancing formability and flexibility for TPP.

Main Methods:

  • Utilized synergistic effects of hydroxyl group-containing prepolymer, UV acrylate, crosslinking monomer, and photo-initiator for polymer formula development.
  • Employed nanoindenter analysis to determine mechanical properties (Young's modulus).
  • Fabricated complex micro-structures (scaffolds, microneedles) and functionalized with MXene for conductivity.

Main Results:

  • Achieved tunable Young's modulus between 0.3 GPa and 1.43 GPa.
  • Successfully printed complex micro-scaffolds and high aspect ratio hollow microneedles.
  • Demonstrated functionalization with MXene for conductivity and confirmed biocompatibility with human lung epithelial cells.

Conclusions:

  • The proposed polymer formulas offer a solution for creating mechanically tunable, highly resolved, and functional micro- and nano-scale structures via TPP.
  • The materials show significant potential for advanced biodevice applications due to their mechanical tunability, functional scalability, and biocompatibility.