4D printing-encapsulated polycaprolactone–thermoplastic polyurethane with high shape memory performances

Rahmatabadi, D, Aberoumand, M, Soltanmohammadi, K, Soleyman, E, Ghasemi, I, Baniassadi, M, Abrinia, K, Bodaghi, M ORCID: https://orcid.org/0000-0002-0707-944X and Baghani, M, 2022. 4D printing-encapsulated polycaprolactone–thermoplastic polyurethane with high shape memory performances. Advanced Engineering Materials: 2201309. ISSN 1438-1656

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Abstract

There are a few shape memory polymers (SMPs) like polylactic acid (PLA) and polyurethane (PU) that are 4D printable, and other SMPs must be synthesized with a complicated chemical lab effort. Herein, considering dual-material extrusion printing and microscopic mechanism behind shape memory effect (SME), bilayer-encapsulated polycaprolactone (PCL)–thermoplastic polyurethane (TPU) shape memory composite structures are 4D printed for the first time. The SME performance is investigated by assessing fixity, shape recovery, stress recovery, and stress relaxation under bending and compression loading modes. PCL, TPU, and melting temperature of PCL play the role of switching phase, net point, and transition temperature, respectively. Due to the destruction and dripping of molten PCL in contact with water, PCL is encapsulated by TPU. Encapsulation successfully solves the challenge of bonding/interface between printed layers, and the results show that the SME performance of the encapsulated structures is higher than bilayer PCL–TPU one's. Experiments reveal that maximum stress recovery in 4D-printed composites remains constant over time. This is a great achievement compared to the previous extrusion-based SMP structures that have great weakness in stress relaxation due to weak and low crystalline fractions and the unraveling of molecular entanglements in semicrystalline and amorphous thermoplastic SMPs, respectively.

Item Type:	Journal article
Publication Title:	Advanced Engineering Materials
Creators:	Rahmatabadi, D., Aberoumand, M., Soltanmohammadi, K., Soleyman, E., Ghasemi, I., Baniassadi, M., Abrinia, K., Bodaghi, M. and Baghani, M.
Publisher:	Wiley
Date:	22 November 2022
ISSN:	1438-1656
Identifiers:	Number Type 10.1002/adem.202201309 DOI 1639105 Other
Rights:	© 2022 The Author(s). This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Divisions:	Schools > School of Science and Technology
Record created by:	Jeremy Silvester
Date Added:	27 Jan 2023 10:57
Last Modified:	27 Jan 2023 10:57
URI:	https://irep.ntu.ac.uk/id/eprint/48079

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