Shape‐Memory Metallopolymers Based on Two Orthogonal Metal–Ligand Interactions

Meurer, Josefine; Hniopek, Julian; Bätz, Thomas; Zechel, Stefan; Enke, Marcel; Vitz, Jürgen; Schmitt, Michael; Popp, Jürgen; Hager, Martin D.; Schubert, Ulrich S.

doi:10.1002/adma.202006655

Cited by 40 publications

(45 citation statements)

References 31 publications

(54 reference statements)

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“…One potential application could be the generation of shape-memory metallopolymers using orthogonal supramolecular interactions. [38] 4. Experimental Section 5,10,15,20-tetraphenylporphyrin, [39] 4-(10,15,20-triphenylporphyrin-5yl)aniline, [40] and 6-([2,2":6",2""-terpyridin]-4'-yloxy)hexanoic acid [29] were synthesized according to already published procedures.…”

Section: Discussionmentioning

confidence: 99%

Selective Metal‐Complexation on Polymeric Templates and Their Investigation via Isothermal Titration Calorimetry

Bätz

Enke

Zechel

et al. 2021

Macro Chemistry & Physics

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Selective complexation of metal ions represents a powerful tool for the development of versatile supramolecular architectures. While research in the field of molecular devices and machinery is sophisticated, the selective formation of metal complexes is not prevalent in polymer chemistry. Thus, the implementation of orthogonal binding concepts into a polymeric matrix is presented. In this context, an end-functionalized poly(N-isopropylacrylamide) (PNIPAm) carrying zinc-porphyrin (ZnTPP) as well as a terpyridine (tpy) ligand side by side is utilized. With these binding sites, the polymer can simultaneously interact with a pyridine moiety via a ZnTPP interaction and a terpyridine unit by the formation of a bis-terpyridine complex. The complexation behavior of this polymer and different model compounds is intensively investigated by isothermal titration calorimetry. The obtained results indicate that the reported orthogonality of these two systems is successfully transferred into a functional polymeric architecture.

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Section: Discussionmentioning

confidence: 99%

Selective Metal‐Complexation on Polymeric Templates and Their Investigation via Isothermal Titration Calorimetry

Bätz

Enke

Zechel

et al. 2021

Macro Chemistry & Physics

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“…Accordingly, this transition is associated with the endothermic signal measured in the DSC and based on the activation of the π–π interactions. Such a behavior could also be observed for other supramolecular polymers; however, the temperature window, in which the drop of the storage and loss moduli occurred, is rather small compared to other self-healing supramolecular polymers, e.g., metallopolymers [ 25 ].…”

Section: Resultsmentioning

confidence: 78%

In-depth characterization of self-healing polymers based on π–π nteractions

Meurer¹,

Hniopek²,

Ahner³

et al. 2021

Beilstein J. Org. Chem.

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The self-healing behavior of two supramolecular polymers based on π–π-interactions featuring different polymer backbones is presented. For this purpose, these polymers were synthesized utilizing a polycondensation of a perylene tetracarboxylic dianhydride with polyether-based diamines and the resulting materials were investigated using various analytical techniques. Thus, the molecular structure of the polymers could be correlated with the ability for self-healing. Moreover, the mechanical behavior was studied using rheology. The activation of the supramolecular interactions results in a breaking of these noncovalent bonds, which was investigated using IR spectroscopy, leading to a sufficient increase in mobility and, finally, a healing of the mechanical damage. This scratch-healing behavior was also quantified in detail using an indenter.

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“…[1][2][3][4][5][6] The characteristics of SMPs, such as their low cost, ease of processing, the flexibility of deformation, and programmability, makes them an excellent candidate for driving materials. [7][8][9] However, single-component SMPs are solely thermal responsive, which is limited by heating group developed cross-link EVA fibers and further studied their 2W-SME under different isostress. [28,29] This study prepares the CNT/EVA composite through a hotpressing and xylene-assisted ultrasonic adsorption two-step process for the EDSMC actuators.…”

Section: Introductionmentioning

confidence: 99%

“…[ 1–6 ] The characteristics of SMPs, such as their low cost, ease of processing, the flexibility of deformation, and programmability, makes them an excellent candidate for driving materials. [ 7–9 ] However, single‐component SMPs are solely thermal responsive, which is limited by heating equipment. SMPs and conductive materials such as carbon black, reduced graphene oxide, metal, and carbon nanotube (CNT) can operate self‐sufficiently without electronic coupling in electrothermally‐driven shape‐memory composites (EDSMC), which researchers are very interested.…”

Section: Introductionmentioning

confidence: 99%

Electrothermally‐Driven Elongating‐Contracting Film Actuators Based on Two‐Way Shape Memory Carbon Nanotube/Ethylene‐Vinyl Acetate Composites

et al. 2021

Adv Materials Technologies

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Electrothermally‐driven shape‐memory composites (EDSMCs) are promising candidates in the field of actuators; however, they are still unable to deliver both substantial stretching strain and precise strain control, which limits their potential applications. A carbon nanotube (CNT) EDSMC composite made from ethylene‐vinyl acetate (EVA) is fabricated in this study using a novel hot‐pressing and xylene‐aided ultrasonic adsorption two‐step procedure to overcome this problem. Because of the outstanding electrical response of the CNT/EVA EDSMC, even at 50% tensile strain, it can accomplish electrothermally‐driven melting‐induced contraction (an extraordinary working limit for shape memory polymers‐based actuators). A large reversible strain and precise strain control can be integrated simultaneously with crystallization‐induced elongation at different cooling time. In addition, programmable actuation behaviors are made possible by the CNT/EVA EDSMC, which can generate predictable and diverse strain changes. Furthermore, the lightweight CNT/EVA EDSMC demonstrates good load capacity and can lift an object to 1000 times its weight. The CNT/EVA EDSMC shows durable performance under repeated elongation and contraction cycles tests over 100 times, without significant reduction of the strain precision, and had broad prospects for both engineering devices and robotics.

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Shape‐Memory Metallopolymers Based on Two Orthogonal Metal–Ligand Interactions

Cited by 40 publications

References 31 publications

Selective Metal‐Complexation on Polymeric Templates and Their Investigation via Isothermal Titration Calorimetry

Selective Metal‐Complexation on Polymeric Templates and Their Investigation via Isothermal Titration Calorimetry

In-depth characterization of self-healing polymers based on π–π nteractions

Electrothermally‐Driven Elongating‐Contracting Film Actuators Based on Two‐Way Shape Memory Carbon Nanotube/Ethylene‐Vinyl Acetate Composites

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