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Development of Dynamic Four-Dimensional Printing Technology for Patterned Structures by Applying Microcellular

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Summary

This study demonstrates novel four-dimensional (4D) printing using common materials like PLA and microcellular foaming processes (MCPs). This approach enables predictable movement in 3D-printed objects without smart materials.

Keywords:
4D printingbatch foaming processmicrocellular foaming processpatterningpolymer

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Area of Science:

  • Materials Science
  • Manufacturing Engineering
  • Polymer Science

Background:

  • Four-dimensional (4D) printing utilizes time as a dimension, enabling 3D-printed objects to change shape in response to stimuli.
  • Conventional 4D printing relies on specialized materials like shape-memory polymers (SMPs) or alloys (SMAs).
  • This limits accessibility and increases costs in applications across soft robotics, aerospace, apparel, and automotive industries.

Purpose of the Study:

  • To explore a novel 4D printing method using microcellular foaming processes (MCPs) applied to 3D printing.
  • To design and fabricate patterned specimens from common materials (e.g., PLA) and analyze their dynamic behavior under foaming conditions.
  • To demonstrate predictable deformation in 3D-printed objects through controlled patterning and foaming.

Main Methods:

  • 3D printing of patterned specimens using polylactic acid (PLA).
  • Application of microcellular foaming processes (MCPs) as an external stimulus.
  • Measurement of specimen bending to quantify dynamic behavior under varying foaming conditions.

Main Results:

  • 3D-printed specimens with MCPs exhibited predictable, controlled deformations.
  • Asymmetric expansion, driven by differential gas saturation during foaming, caused the observed movements.
  • Successful realization of 4D printing using conventional materials and foaming processes.

Conclusions:

  • Four-dimensional (4D) printing is achievable with standard materials like PLA, eliminating the need for smart materials.
  • Microcellular foaming processes (MCPs) offer a new, accessible external stimulus for 4D printing applications.
  • Combining 3D printing with MCPs presents a promising pathway for advanced, cost-effective 4D printing technologies.