Shape-Memory Polymers Designed in View of Thermomechanical Energy Storage and Conversion Systems

Lendlein, Andreas; Heuchel, Matthias

doi:10.1021/acscentsci.1c01032

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…Shape memory polymers (SMPs) can change their configuration and macroscopic shape between permanent and temporary states 31 , 32 . The temporary shape is usually obtained through mechanical deformation under certain conditions, such as heating above the glass transition temperature ( T g ), followed by shape fixation upon cooling.…”

Section: Introductionmentioning

confidence: 99%

Halogen-bonded shape memory polymers

et al. 2022

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Halogen bonding (XB), a non-covalent interaction between an electron-deficient halogen atom and a Lewis base, is widely adopted in organic synthesis and supramolecular crystal engineering. However, the roadmap towards materials applications is hindered by the challenges in harnessing this relatively weak intermolecular interaction to devise human-commanded stimuli-responsive soft materials. Here, we report a liquid crystalline network comprising permanent covalent crosslinks and dynamic halogen bond crosslinks, which possess reversible thermo-responsive shape memory behaviour. Our findings suggest that I···N halogen bond, a paradigmatic motif in crystal engineering studies, enables temporary shape fixation at room temperature and subsequent shape recovery in response to human body temperature. We demonstrate versatile shape programming of the halogen-bonded polymer networks through human-hand operation and propose a micro-robotic injection model for complex 1D to 3D shape morphing in aqueous media at 37 °C. Through systematic structure-property-performance studies, we show the necessity of the I···N crosslinks in driving the shape memory effect. The halogen-bonded shape memory polymers expand the toolbox for the preparation of smart supramolecular constructs with tailored mechanical properties and thermoresponsive behaviour, for the needs of, e.g., future medical devices.

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Section: Introductionmentioning

confidence: 99%

Halogen-bonded shape memory polymers

et al. 2022

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“…Trapping such processing-induced stretched states, e.g., by a temperature quench or rapid removal of solvent, generates states of nonequilibrated polymers, − yielding improved material properties like high toughness and yield stress, strongly enhanced Young’s modulus, and substantial birefringence. − Furthermore, it has been suggested that deformed polymers may serve as an “energy sink” by transforming local stresses into changes in conformational entropy, thereby storing energy in their deformation modes . Feeding energy into states of deformed polymer chains may potentially introduce responsiveness by releasing (part of) the stored energy. − …”

Section: Introductionmentioning

confidence: 99%

Mechanism for the Formation of Millimeter-Long Solid Filaments by Spin Coating Dilute Solutions of a Crystallizable Polymer

Huang,

Hugel,

Reiter

2024

Macromolecules

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We have investigated the formation of millimeter-long filaments induced by spin-coating ca. 130 °C dilute para-xylene solutions of rapidly crystallizable polyethylene chains with a contour length in the micrometer range onto ca. 80 °C mica substrates. These filaments were radially oriented and accumulated on the periphery of the substrate. Our observations can be explained by the stretching of polymers through the flow field induced by spinning the solution on a solid substrate. The corresponding loss in conformational entropy emphasized attractive interactions between polymers, which resulted in the formation of bundles and their assembly into long filaments. Caused by a Plateau−Rayleigh-type instability of a liquid coating on a solid filament and due to crystallization, these filaments were decorated with various small-scale structures. Still in solution, the resulting filaments experienced a Coriolis force as they were dragged toward the periphery of the sample, causing a deviation of their orientation from the radial direction. Finally, filaments adsorbed on the substrate, solvent evaporated completely, and the resulting variety of crystalline patterns and morphologies were examined by various microscopy techniques.

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Bionic design and performance research of tracheal stent based on shape memory polycaprolactone

Zhao

Huang²,

Liu³

et al. 2022

Composites Science and Technology

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Shape-Memory Polymers Designed in View of Thermomechanical Energy Storage and Conversion Systems

Abstract: Effective temporary shape fixation by strain-induced formation of supramolecular nanostructures enables high energy density one-way shape-memory polymers.

Cited by 4 publications

References 7 publications

Halogen-bonded shape memory polymers

Halogen-bonded shape memory polymers

Mechanism for the Formation of Millimeter-Long Solid Filaments by Spin Coating Dilute Solutions of a Crystallizable Polymer

Bionic design and performance research of tracheal stent based on shape memory polycaprolactone

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