Digital Light Processing of Thermoresponsive Hydrogels from Polyproline-Based Star Polypeptides.

Area of Science:

• Polymer Chemistry
• Biomaterials Science
• 3D Printing Technology

Background:

• Thermoresponsive hydrogels are crucial for advanced applications.
• Digital light processing (DLP) offers high-resolution 3D printing capabilities.
• Developing novel crosslinkers is key to enhancing hydrogel performance.

Purpose of the Study:

• To report the first use of star poly(L-proline) as crosslinkers for DLP 3D printing.
• To investigate the influence of poly(L-proline) molecular weight on hydrogel properties.
• To explore the potential for creating shape-morphing hydrogels.

Main Methods:

• Synthesis of star poly(L-proline)s.
• Functionalization of polymer chain ends with methacryloyl groups.
• Digital light processing (DLP) 3D printing using photoinitiated free radical polymerization.
• Characterization of hydrogel thermoresponsiveness, printability, and shape-morphing behavior.

Main Results:

• Successfully fabricated high-resolution 3D hydrogel structures using star poly(L-proline) crosslinkers via DLP.
• Demonstrated that poly(L-proline) molecular weight directly impacts thermoresponsiveness and printability.
• Achieved thermally induced shape-morphing behavior in the printed hydrogels.

Conclusions:

• Star poly(L-proline)s are effective crosslinkers for DLP 3D printing of thermoresponsive hydrogels.
• Polymer molecular weight is a critical parameter for tuning hydrogel properties and printability.
• This approach enables the development of advanced 3D printed materials with tunable thermoresponsive and shape-morphing capabilities.