Advancing sustainable shape memory polymers through 4D printing of polylactic acid-polybutylene adipate terephthalate blends

Rahmatabadi, D., Khajepour, M., Bayati, A., Mirasadi, K., Amin Yousefi, M., Shegeft, A., Ghasemi, I., Baniassadi, M., Abrinia, K., Bodaghi, M. ORCID: 0000-0002-0707-944X and Baghani, M., 2024. Advancing sustainable shape memory polymers through 4D printing of polylactic acid-polybutylene adipate terephthalate blends. European Polymer Journal, 216: 113289. ISSN 0014-3057

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Abstract

One of the major challenges in 4D printed Shape Memory Polymers (SMPs) is their slow response to thermal stimuli. Synthetic carbon fillers have been introduced to address this issue; however, their use comes with environmental concerns. On the other hand, Polylactic Acid (PLA) is commonly used for 3D/4D printing of SMPs, but it requires softening to achieve large deformations. This research paper introduces a sustainable solution through blending PLA with Polybutylene Adipate Terephthalate (PBAT) that not only addresses these challenges but also possesses environmental eco-friendliness due to PBAT’s high biodegradability rate. PBAT with weight percentages of 15 %, 30 %, and 45 % is utilized to soften PLA, and their composites are successfully 4D printed. Mechanical properties, shape memory effects, morphology, and thermal behaviors are comprehensively investigated. The results show that blending PLA with 45 % PBAT weight results in excellent features such as 220 % elongation and 93 % shape recovery in just a few seconds. The other two PLA-PBAT blends achieve complete shape recovery in less than 8 s. The PLA-PBAT contains 15 % PBAT, in addition to high strength (40 MPa), has 17 % elongation. This, coupled with the low melting temperature of PBAT, drives the high shape recovery rate. Scanning electron microscopy images finally confirm the high printability of all three blends, with the PLA-PBAT composite containing 30 % PBAT exhibiting the best quality in layer interfaces and the least porosity.

Item Type:	Journal article
Publication Title:	European Polymer Journal
Creators:	Rahmatabadi, D., Khajepour, M., Bayati, A., Mirasadi, K., Amin Yousefi, M., Shegeft, A., Ghasemi, I., Baniassadi, M., Abrinia, K., Bodaghi, M. and Baghani, M.
Publisher:	Elsevier
Date:	7 August 2024
Volume:	216
ISSN:	0014-3057
Identifiers:	Number Type 10.1016/j.eurpolymj.2024.113289 DOI S0014305724005500 Publisher Item Identifier 1914519 Other
Rights:	This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Divisions:	Schools > School of Science and Technology
Record created by:	Jonathan Gallacher
Date Added:	15 Jul 2024 10:11
Last Modified:	15 Jul 2024 10:11
URI:	https://irep.ntu.ac.uk/id/eprint/51752

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