On demand shape memory polymer via light regulated topological defects in a dynamic covalent network

Miao, Wusha; Zou, Weike; Jin, Binjie; Ni, Chujun; Zheng, Ning; Zhao, Qian; Xie, Tao

doi:10.1038/s41467-020-18116-1

Cited by 93 publications

(81 citation statements)

References 40 publications

(48 reference statements)

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“…[ 4 ] 4D printing, on the other hand, is a term that refers to the combination of 3D printing with new classes of shape memory materials (SMMs) to fabricate time‐dependent objects that can be switched between various configurations under external stimuli, e.g., temperature, electric field, moisture, or light. [ 5–8 ] Natural phenomena and biological systems with shape transformation behavior inspire scientists and engineers all over the world to create artificial patterns and designs for 4D printing from various SMMs. [ 9–11 ] Among SMMs, stimuli‐responsive hydrogels capable of shape‐changing have gained particular attention because of their biocompatibility and ability to mimic functions of extracellular matrices.…”

Section: Introductionmentioning

confidence: 99%

Development of Thermoinks for 4D Direct Printing of Temperature‐Induced Self‐Rolling Hydrogel Actuators

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Nizioł

Szymczyk‐Ziółkowska

et al. 2021

Adv Funct Materials

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4D printing has emerged as an important technique for fabricating 3D objects from programmable materials capable of time‐dependent reshaping. In the present investigation, novel 4D thermoinks composed of laponite (LAP), an interpenetrating network of poly(N‐isopropylacrylamide) (PNIPAAm), and alginate (ALG) are developed for direct printing of shape‐morphing structures. This approach consists of the design and fabrication of 3D honeycomb‐patterned hydrogel discs self‐rolling into tubular constructs under the stimulus of temperature. The shape morphing behavior of hydrogels is due to shear‐induced anisotropy generated via 3D printing. The compositionally tunable hydrogel discs can be programmed to exhibit different actuation behaviors at different temperatures. Upon immersion in 12 °C water, singly crosslinked sheets roll up into a tubular construct. When transferred to 42 °C water, the tubes first rapidly unfold and then slightly curve up in the opposite direction. Through a dual photocrosslinking of PNIPAAm, it is possible to inverse temperature‐dependent shape morphing and induce self‐folding at higher and unrolling at lower temperatures. The extensive self‐assembling motion is essential to developing thermal actuators with broad applications in, e.g., soft robotics and active implantology, whereas controllable self‐rolling of planar hydrogels is of the highest interest to biomedical engineering as it allows for effective fabrication of hollow tubes.

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Section: Introductionmentioning

confidence: 99%

Development of Thermoinks for 4D Direct Printing of Temperature‐Induced Self‐Rolling Hydrogel Actuators

Podstawczyk

Nizioł

Szymczyk‐Ziółkowska

et al. 2021

Adv Funct Materials

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“…The topology structure often has an impact on properties of materials. [ 58 ] After the original sulfur crosslinks reconnected by DIB, the motion of molecular chains is restricted and much more rubber chains bear external stress. Consequently, the changes in topology structure significantly improve the strength of NR–DIB samples upon thermo–oxidative aging.…”

Section: Resultsmentioning

confidence: 99%

Enabling Superior Thermo–Oxidative Resistance Elastomers Based on a Structure Recovery Strategy

Zhang

et al. 2021

Macromol. Rapid Commun.

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Thermo–oxidative process leads to the structure damage of elastomers, such as the scission of main chains and destruction of crosslinks. The problem that damaged structure brings about the deterioration of mechanical properties has not been solved by the conventional anti‐aging methods. Inspired by self‐healing process, a structure recovery strategy for recovering the damaged structure induced by thermo–oxidative process is proposed, which endows elastomers with superior thermo–oxidative resistance. The high reactivity between 1,3‐diisopropenylbenzene and free radicals realizes high recovery efficiency (from 83% to 118%); the changes in topology structure during recovery process make much more rubber chains bear external stress and improve mechanical properties significantly (from 18.5 to 29.6 MPa). This work paves the way for the development of elastomers with superior thermo–oxidative resistance, meanwhile this work is helpful to push the theoretical research of self‐healing to practical application.

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“…Moreover, Miao et al used the concept of topological isomerizable network to design a light-triggered SMP based on polyethylene glycol diacrylate (PEGDA) offering ester bonds [74]. The ester bonds could undergo transesterification reaction with the pendent hydroxyls as shown in Figure 4b.…”

Section: Reversible Smps Based On Thermo-and Light-activated Covalent Bondsmentioning

confidence: 99%

Electrospun Shape Memory Polymer Micro-/Nanofibers and Tailoring Their Roles for Biomedical Applications

2021

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Shape memory polymers (SMPs) as a relatively new class of smart materials have gained increasing attention in academic research and industrial developments (e.g., biomedical engineering, aerospace, robotics, automotive industries, and smart textiles). SMPs can switch their shape, stiffness, size, and structure upon being exposed to external stimuli. Electrospinning technique can endow SMPs with micro-/nanocharacteristics for enhanced performance in biomedical applications. Dynamically changing micro-/nanofibrous structures have been widely investigated to emulate the dynamical features of the ECM and regulate cell behaviors. Structures such as core-shell fibers, developed by coaxial electrospinning, have also gained potential applications as drug carriers and artificial blood vessels. The clinical applications of micro-/nanostructured SMP fibers include tissue regeneration, regulating cell behavior, cell growth templates, and wound healing. This review presents the molecular architecture of SMPs, the recent developments in electrospinning techniques for the fabrication of SMP micro-/nanofibers, the biomedical applications of SMPs as well as future perspectives for providing dynamic biomaterials structures.

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On demand shape memory polymer via light regulated topological defects in a dynamic covalent network

Cited by 93 publications

References 40 publications

Development of Thermoinks for 4D Direct Printing of Temperature‐Induced Self‐Rolling Hydrogel Actuators

Development of Thermoinks for 4D Direct Printing of Temperature‐Induced Self‐Rolling Hydrogel Actuators

Enabling Superior Thermo–Oxidative Resistance Elastomers Based on a Structure Recovery Strategy

Electrospun Shape Memory Polymer Micro-/Nanofibers and Tailoring Their Roles for Biomedical Applications

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