4D printed thermally activated self-healing and shape memory polycaprolactone-based polymers

Invernizzi, Marta; Turri, Stefano; Levi, Marinella; Suriano, Raffaella

doi:10.1016/j.eurpolymj.2018.02.023

Cited by 166 publications

(144 citation statements)

References 61 publications

(64 reference statements)

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“…However, the inherent brittleness and poor thermal stability of PLA have seriously limited its practical application . Poly(ε‐caprolactone) (PCL) is a biodegradable, semi‐crystalline, flexible polymer with low glass transition and melting temperature ( T g = −50 °C, T m = 60 °C), which is often used to modify PLA by blending and copolymerization . And the PCL/PLA blend can show improved toughness and thermal stability and exhibit good thermo‐sensitive shape memory performance .…”

Section: Introductionmentioning

confidence: 99%

Fast and Efficient Electric‐Triggered Self‐Healing Shape Memory of CNTs@rGO Enhanced PCLPLA Copolymer

Ren

Chen

Yang

et al. 2019

Macro Chemistry & Physics

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Shape memory and self‐healing stimuli‐responsive polymeric materials have aroused extensive research interests due to their special functionality. In this work, a kind of novel and fast electric‐triggered self‐healing shape memory polymeric composite, based on polycaprolactone‐polylactic acid (PCLPLA) copolymer and reduced graphene oxide with embedded carbon nanotubes (CNTs@rGO), are prepared via a facile method. Interestingly, the CNTs@rGO‐PCLPLA composites show improved mechanical properties, excellent electrical conductivity, and could recover their original shape within 60 s by applying 1.42 V mm−1 electric field. Meanwhile, the proposed networks can be self‐heal rapidly and efficiently under electrothermal effect. These offer for the new material promising practical applications in aerospace, artificial skins, and electronic sensors.

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Section: Introductionmentioning

confidence: 99%

Fast and Efficient Electric‐Triggered Self‐Healing Shape Memory of CNTs@rGO Enhanced PCLPLA Copolymer

Ren

Chen

Yang

et al. 2019

Macro Chemistry & Physics

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“…Robust mechanical properties, especially mechanical strength, and excellent self‐healing ability are massively important for the high performance of soft robots. Figure c demonstrates ultimate tensile strength and healing efficiency comparison of various soft actuator materials (details are in Table S3, Supporting Information) . Thanks to the reversible hydrogen bonding and covalent bonding crosslinking networks (Figure a), our actuator material has two distinctive advantages: i) it exhibits relatively high mechanical ultimate strength (3 MPa) and stretchability, which make it more robust than other soft actuators for further applications .…”

mentioning

confidence: 99%

Arbitrarily 3D Configurable Hygroscopic Robots with a Covalent–Noncovalent Interpenetrating Network and Self‐Healing Ability

et al. 2019

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Very recently, dynamic exchangeable covalent-bonding-based liquid crystal elastomer provided a new route for actuators with 3D shape mouldability and actuation capacity. [2,13,14] The dynamic transesterification reaction of these materials occurs at a temperature generally above 160 °C to allow shape molding, such as 3D flower and 3D wheel. [11] Meanwhile, Zhang et al. [10] prepared microchannel-programmed actuators through UV lithography template method. The film actuator is capable of reversibly changing its 3D shapes when exposed to acetone vapor. Despite brilliant advances, the manufacturing of those polymeric actuators typically involves high melt temperature, high pressure, hazardous chemical solvent or sophisticated machining equipment, which dramatically restricts the shaping of the actuators with complicated 3D structure. Furthermore, few soft actuators can maintain their inherent 3D structures when completely cut or damaged, and the entire devices have to be disposed. To conclude, a soft actuator with straightforward and eco-friendly shaping and reshaping processing condition and excellent self-healing ability is highly demanded.To address this issue, we present a biopolyester with hydrogen bonding and covalent bonding interpenetrating network, resulting in a mechanically robust, hygroscopic actuator that can arbitrarily shape and reshape the 3D geometric configuration at low ambient temperature (≤35 °C). Meanwhile, it exhibits excellent self-healing ability to maintain high performance of 3D structured actuators. Furthermore, specific 3D structures of the water-gradient-driven actuators are demonstrated to achieve different potential applications. The arbitrary shape deformations that copolyesters undergo at low temperature can inspire a new generation of synthetic soft actuators, which are in demand for actuating technologies, such as biomedical devices, flexible electronics, and soft robotics.To prepare the hygroscopic actuator with shaping and reshaping processability at low ambient temperature (≤35 °C), humidity-responsive macromolecular prepolymer with the melting point (T m = 23.48 °C) was first synthesized through the effective condensation copolymerization reaction of crystalline poly(ethylene glycol) (PEG) and poly(tetramethylene glycol) (PTMG) precursor ( 1 H NMR, gel permeation chromatography (GPC), and differential scanning calorimetry (DSC) analysis Soft materials that can reversibly transform shape in response to moisture have applications in diverse areas such as soft robotics and biomedicine. However, the design of a structurally transformable or mechanically selfhealing version of such a humidity-responsive material, which can arbitrarily change shape and reconfigure its 3D structures remains challenging. Here, by drawing inspiration from a covalent-noncovalent network, an elaborately designed biopolyester is developed that features a simple hygroscopic actuation mechanism, straightforward manufacturability at low ambient temperature (≤35 °C), fast and stable response, robust mechanica...

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“…Devices able to heal during performance can be exemplified by the supramolecular matrix comprising poly(glycerol sebacate) (PGS) chains and ureido‐pyrimidinone grafts, which are capable of forming strong hydrogen bonds. The very recent studies conducted by Kuang et al and Invernizzi et al illustrate the remarkable potential of the synergistic combination of shape memory and self‐healing capabilities, with the unique spatial resolution inherent to 3D printing technologies in the medical devices arena.…”

Section: Physical Phenomenamentioning

confidence: 99%

In Situ Generated Medical Devices

Cohn

Sloutski

Elyashiv

et al. 2019

Adv Healthcare Materials

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Medical devices play a major role in all areas of modern medicine, largely contributing to the success of clinical procedures and to the health of patients worldwide. They span from simple commodity products such as gauzes and catheters, to highly advanced implants, e.g., heart valves and vascular grafts. In situ generated devices are an important family of devices that are formed at their site of clinical function that have distinct advantages. Among them, since they are formed within the body, they only require minimally invasive procedures, avoiding the pain and risks associated with open surgery. These devices also display enhanced conformability to local tissues and can reach sites that otherwise are inaccessible. This review aims at shedding light on the unique features of in situ generated devices and to underscore leading trends in the field, as they are reflected by key developments recently in the field over the last several years. Since the uniqueness of these devices stems from their in situ generation, the way they are formed is crucial. It is because of this fact that in this review, the medical devices are classified depending on whether their in situ generation entails chemical or physical phenomena.

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4D printed thermally activated self-healing and shape memory polycaprolactone-based polymers

Cited by 166 publications

References 61 publications

Fast and Efficient Electric‐Triggered Self‐Healing Shape Memory of CNTs@rGO Enhanced PCLPLA Copolymer

Fast and Efficient Electric‐Triggered Self‐Healing Shape Memory of CNTs@rGO Enhanced PCLPLA Copolymer

Arbitrarily 3D Configurable Hygroscopic Robots with a Covalent–Noncovalent Interpenetrating Network and Self‐Healing Ability

In Situ Generated Medical Devices

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