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Mechanically Robust and UV-Curable Shape-Memory Polymers for Digital Light Processing Based 4D Printing.

Biao Zhang^1,2,3, Honggeng Li^2,3, Jianxiang Cheng^2,3

¹Frontiers Science Center for Flexible Electronics (FSCFE), Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials and Engineering (IBME), Northwestern Polytechnical University, 127 West Youyi Road, Xi'an, 710072, China.

Advanced Materials (Deerfield Beach, Fla.)

|May 17, 2021

Summary

This summary is machine-generated.

Researchers developed a new mechanically robust, UV-curable shape-memory polymer (SMP) for 4D printing. This advanced material enables high-resolution, complex structures with significant shape change and excellent fatigue resistance for engineering applications.

Keywords:

4D printing Digital Light Processing high stretchability shape-memory polymers

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Area of Science:

Materials Science
Additive Manufacturing
Polymer Chemistry

Background:

4D printing utilizes stimuli-responsive materials to create dynamic structures.
Shape-memory polymers (SMPs) offer advantages in stiffness and 3D printing compatibility for 4D printing.
Existing UV-curable SMPs for Digital Light Processing (DLP) 3D printing have limitations in mechanical performance.

Purpose of the Study:

To develop a mechanically robust and UV-curable SMP system for advanced 4D printing applications.
To overcome the mechanical limitations of current UV-curable SMPs used in DLP 3D printing.
To enable the fabrication of high-resolution, complex 4D printed structures with enhanced durability.

Main Methods:

Formulation of a novel UV-curable SMP system.
Characterization of the SMP's mechanical properties, including deformability and fatigue resistance.
Fabrication of high-resolution (up to 2 µm) and complex 3D structures using DLP-based 3D printing.

Main Results:

The developed SMP system demonstrates high deformability and fatigue resistance, enduring over 10,000 loading cycles.
Fabricated 3D structures exhibit large shape changes (up to 1240%) upon heating.
The SMP is compatible with DLP 3D printing, producing high-resolution and intricate geometries.

Conclusions:

The novel mechanically robust, UV-curable SMP significantly enhances the performance of 4D printed structures.
This advancement broadens the applicability of SMP-based 4D printing in demanding engineering fields.
Potential applications include aerospace components, smart furniture, and soft robotics.