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Network Modulation Enables 3D-Printed Citrate-Based Polymer Scaffolds with Broadly Tunable Mechanical Performance for
Biorxiv : the Preprint Server for Biology
|February 23, 2026
Summary
Researchers engineered citrate-based polymers (CBP) for 3D printing, enhancing mechanical properties and toughness. These advanced biomaterials show promise for diverse tissue engineering applications.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Regenerative Medicine
Background:
- Biomaterials with tunable mechanical properties are crucial for biomedical applications.
- Photopolymerizable citrate-based polymers (CBP), like methacrylate polydiolcitrate (mPDC), are used for 3D printing biodegradable scaffolds.
- mPDC scaffolds often exhibit brittleness due to highly crosslinked networks, limiting their use.
Purpose of the Study:
- To develop network-engineering strategies for modulating crosslinking density and topology of CBPs.
- To enhance the mechanical properties, particularly toughness and ductility, of mPDC biomaterials.
- To create a versatile biomaterial platform for diverse tissue engineering applications.
Main Methods:
- Incorporation of acrylate-based reactive diluents (isobornyl acrylate, IBOA) and/or a thiol-based chain transfer agent (3,6-dioxa-1,8-octanedithiol, DOD) into mPDC.
- Characterization of mechanical properties including Young's modulus, ultimate tensile strength, and strain at break.
- Assessment of biodegradability, cytocompatibility, and 3D printability.
- Fabrication and evaluation of 3D-printed meniscus scaffolds and vascular stents.
Main Results:
- Achieved broadly tunable mechanical properties with Young's modulus (6.8-134 MPa), ultimate tensile strength (1.8-18 MPa), and strain at break (14-61%).
- IBOA incorporation significantly enhanced toughness, while combined IBOA and DOD improved ductility.
- All mPDC composites demonstrated tunable biodegradability, good cytocompatibility, and excellent 3D printability.
- 3D-printed scaffolds supported chondrocyte growth and fibrochondrogenic matrix deposition, and vascular stents supported endothelial cell formation.
Conclusions:
- Developed facile network-engineering strategies to create versatile photopolymerizable citrate-based biomaterials.
- The engineered biomaterials exhibit broadly tunable mechanical performance, controllable biodegradability, and good cytocompatibility.
- These advanced biomaterials offer significant potential for customized biomedical applications, including load-bearing and soft tissue engineering.
