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4D printing light-driven actuator with lignin photothermal conversion module.

Zechun Ren¹, Kejiao Ding¹, Xinyuan Zhou¹

¹Material Science and Engineering College, Northeast Forestry University, Harbin 150040, China.

International Journal of Biological Macromolecules

|August 31, 2023

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This study introduces 4D printed poly(lactic acid) (PLA) composites using lignin for near-infrared light-responsive shape memory. These environmentally friendly materials show potential as actuator components.

Area of Science:

Materials Science
Polymer Science
Additive Manufacturing

Background:

Light-responsive shape memory polymers offer remote and spatial control.
Poly(lactic acid) (PLA) is a versatile polymer for 3D printing applications.

Purpose of the Study:

To develop 4D printable, near-infrared light-responsive PLA composites.
To investigate the use of lignin as a photothermal agent in PLA composites.
To enhance the properties of PLA composites for 4D printing applications.

Main Methods:

Melt blending of PLA with 3 wt% lignin.
Incorporation of dicumyl peroxide (DCP) to modify lignin structure and improve interfacial adhesion.
3D printing and characterization of the resulting composites.

Keywords:

3D printing Lignin Shape memory

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Main Results:

PLA composites exhibited significant photothermal effects under near-infrared laser irradiation.
Near-infrared laser irradiation effectively initiated and controlled shape memory.
DCP treatment improved interfacial adhesion, reduced dispersed phase size, and optimized rheological properties for 3D printing.
Composites demonstrated good mechanical and thermal stability.

Conclusions:

A practical and environmentally friendly method for creating light-responsive 4D printed PLA composites was established.
Lignin acts as an effective photothermal agent, enabling light-induced shape memory.
These composites show promise as actuator components in various applications.