Journal
ADDITIVE MANUFACTURING
Volume 38, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.addma.2020.101718
Keywords
Extrusion-based additive manufacturing; Shape memory polymer; In-situ microfibers; 4D printing
Funding
- National Natural Science Foundation of China [51433006]
- Key Laboratory for Precision and Non-Traditional Machining Technology, Dalian University of Technology [JMTZ201702]
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Extrusion-based additive manufacturing was used to prepare TPU/PLA samples with a microfiber structure that could significantly reinforce the matrix and benefit shape memory performance. Under specific conditions, the samples could maintain deformation and recover automatically, providing an efficient method for creating 4D-printed samples.
Extrusion-based additive manufacturing was used to prepare polyurethane/polylactide (TPU/PLA) samples. The PLA phase was deformed into a microfiber structure because of the strong shear effect of extrusion-based additive manufacturing. This novel microfiber could not only reinforce considerably the matrix but was also beneficial to the shape memory property. When stretched at an appropriate temperature, the samples could maintain their deformation after cooling and recover automatically after thermal stimulation. Thus, a high-efficiency method to create 4D-printed samples by extrusion-based additive manufacturing is proposed. The effects of phase morphology and molecule structure on the shape memory cycle are also discussed.
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