4D Fabrication of Two‐Way Shape Memory Polymeric Composites by Electrospinning and Melt Electrowriting

Pasini, Chiara; Soreño, Zhander Vohr; Schönfeld, Dennis; Pretsch, Thorsten; Constante, Gissela; Sadilov, Ilia; Ionov, Leonid

doi:10.1002/marc.202400010

Cited by 3 publications

(1 citation statement)

References 38 publications

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“…This approach, based on using homopolymer with broad melting region, tunable based on the polymer precursor, is thus promising in the field of 3D printing of two-way SMPs, i.e. 4D printing, for reversible and selfstanding actuators, which are currently being explored with many various approaches [44][45][46][47][48].…”

Section: Comparison Between the Stress-driven And The Stress-free Two...mentioning

confidence: 99%

Tailoring the stress-free two-way shape memory effect in sol–gel crosslinked poly(ϵ-caprolactone)-based semicrystalline networks

Inverardi,

Toselli,

Messori

et al. 2024

Smart Mater. Struct.

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Two-way shape memory polymers are stimulus-responsive materials capable of changing their shape between two configurations based on an on/off thermal stimulus. While the traditional effect has been studied under the application of an external mechanical load, it was demonstrated also in the absence of an external load. Such a response only relies on a carefully tailored macromolecular architecture of the polymer combined with a specific thermo-mechanical protocol. In particular, semicrystalline networks, either consisting of a multi-phase copolymer network or a homopolymer based network with broad phase transitions, have been proposed to this aim under ad-hoc thermo-mechanical histories. In this work, the two-way shape memory behaviour is studied on a poly(ε-caprolactone)-based network, crosslinked by means of a sol-gel approach and tailored on the selection of the molecular weight of the precursor polymer. Changing the prepolymer precursor allowed to tune the melting/crystallization regions of the networks, thus the thermal region of the reversible shape memory effect. The application of properly designed thermo-mechanical cycles allowed to study the two-way shape memory effect without the application of an external load under tensile conditions. Given a specific network, the stress-free actuation of the reversible elongation-contraction cycle under tensile conditions was induced across its specific melting/crystallization region. The extent of the effect was found to depend on the crystalline fraction remaining for the given actuation temperature and on the tensile stretched state imposed on the materials during the training step.The results were compared with the response achieved under the traditional two-way shape memory protocol under stress. The stress-free two-way shape memory effect was also successfully demonstrated and emphasized, under flexural conditions, which suggests the potential of these materials as intrinsically reversible actuators, promising for applications in the biomedical field and/or for soft robotics. 

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Section: Comparison Between the Stress-driven And The Stress-free Two...mentioning

confidence: 99%

Tailoring the stress-free two-way shape memory effect in sol–gel crosslinked poly(ϵ-caprolactone)-based semicrystalline networks

Inverardi,

Toselli,

Messori

et al. 2024

Smart Mater. Struct.

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Investigating the Effect of Chain Extender on the Phase Separation and Mechanical Properties of Polybutadiene‐Based Polyurethane

Niu,

Wang,

Wang

et al. 2024

Macromol. Rapid Commun.

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The thermodynamic incompatibility between the soft and hard segments of thermoplastic polyurethane (TPU) results in a microphase‐separated behavior and excellent mechanical properties. However, the effect of the chain extender on the degree of microphase separation (DMS) and the resultant mechanical properties of TPU have not been well studied because of the complex interactions between the soft and hard segments. Herein, hydroxyl‐terminated polybutadiene‐based TPUs(HTPB‐TPUs) without hydrogen bonding between the soft and hard segments are synthesized using hydroxyl‐terminated polybutadiene, toluene diisocyanate, and four different chain extenders, and the effect of the chain extender structure on DMS is analyzed experimentally using a combination of analytical techniques. Furthermore, the solubility parameters of the soft and hard segments, glass transition temperatures, and hydrogen‐bond density of the HTPB‐TPUs, are computed using all‐atom molecular dynamics simulations. The results clearly reveal that the chain extender significantly affects the DMS and thus the mechanical properties of HTPB‐TPUs. This study paves the way for studying the relationship between the structure and properties of TPU.

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Programmable materials: Current trends, challenges, and perspectives

Scalet

2024

Applied Materials Today

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4D Fabrication of Two‐Way Shape Memory Polymeric Composites by Electrospinning and Melt Electrowriting

Cited by 3 publications

References 38 publications

Tailoring the stress-free two-way shape memory effect in sol–gel crosslinked poly(ϵ-caprolactone)-based semicrystalline networks

Tailoring the stress-free two-way shape memory effect in sol–gel crosslinked poly(ϵ-caprolactone)-based semicrystalline networks

Investigating the Effect of Chain Extender on the Phase Separation and Mechanical Properties of Polybutadiene‐Based Polyurethane

Programmable materials: Current trends, challenges, and perspectives

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