Thermal/Near‐Infrared Light Dual‐Responsive Reconfigurable and Recyclable Polythiourethane/CNT Composite with Simultaneously Enhanced Strength and Toughness

Zhao, Chunrui; Yue, Huimin; Huang, Ming-Qiu; He, Suqin; Líu, Hao; Liu, Wentao; Zhu, Chengshen; Jiang, Lei

doi:10.1002/marc.202200806

Cited by 4 publications

(3 citation statements)

References 67 publications

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“…Reprogrammable soft matter is able to execute different motions through reversibly programmed/erased procedures within the same material, providing remarkable multifunctionality, exibility and environmental suitability for soft photoactuators. 12,13 Homogeneous photoresponsive soft materials can be reprogrammed by spatial light control, which shows diverse deformations to cast the light on different parts of the materials with various photomasks during operation. 12,14,15 This complicates the construction and control of the photoactuators and limits the applications.…”

Section: Introductionmentioning

confidence: 99%

Switchable Photothermal Conversion Efficiency for Reprogrammable Actuation

Liu

Luo

et al. 2023

Preprint

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Reprogrammable soft matter brings flexibility to soft robots so that they can display various motions, which is flourishing in soft robotics. However, the reprogramming of photoresponsive materials used in soft robots is time-consuming using existing methods. In this study, we promote a novel strategy for rapid reprogramming via switchable photothermal conversion efficiency (PCE). The liquid crystalline elastomers doped with semiconductor bismuth compounds (Bi-LCE) used in this work exhibited large photothermal actuation with over 35% shrinkage in 5 seconds at high PCE state, which demonstrated little deformation at low PCE state. Furthermore, the material was capable of being reprogrammed for up to 10 times, with only 20 minutes required for one PCE reversible switch. Based on this switchable PCE effect, the same Bi-LCE film displayed various shape changes through different programmable pattern. Additionally, a reprogrammable hollow tube made of PCE reprogrammable materials could tune the diameter, cross section configuration, and surface morphology, which was crucial for microfluidics field. Reprogrammable materials provide endless possibilities for reusability and sustainability in robotics.

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Section: Introductionmentioning

confidence: 99%

Switchable Photothermal Conversion Efficiency for Reprogrammable Actuation

Liu

Luo

et al. 2023

Preprint

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“…TPUEs can be recycled based on the dynamic urea bond and maintain remarkable mechanical properties and chemical stability after multiple rounds of recycling. Thiocarbamate dynamic chemistry provides a relatively fast, facile, and efficient method for preparing reprocessable cross-linking polymer materials from commercial monomers. ,, In our previous works, we have prepared recyclable and reprocessable polycarbonate-based and polycaprolactone-based polythiourethane (PTU) cross-linking networks, showing good mechanical properties and reprocessing efficiencies. − However, the synthesis and molding processes of cross-linked polythiourethane still occur together.…”

Section: Introductionmentioning

confidence: 99%

Fully Closed-Loop Recyclable Thermosetting Polythiourethane Microspheres and Their Application in Efficient Fabrication of Composites with Segregated Structures

Yao

Huang

et al. 2023

ACS Appl. Eng. Mater.

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Introducing dynamic covalent bonds into cross-linked polymer endows thermosetting polymers with thermoplastic properties such as reprocessability and recyclability, providing a solution to the environmental problems induced by thermosetting polymers. However, unlike thermoplastic polymers, the synthesis and molding processes of most thermosetting polymers with covalent adaptable networks still maintain together, affecting the development of industrial production. Herein, the cross-linked polythiourethane microspheres (PTUMs) with dynamic covalent bonds have been prepared by suspension polymerization. The PTUMs can be closed-loop-recycled and shows no significant performance degradation after recycling, paving an easy and efficient way for the recycling of cross-linked polymers. Furthermore, as with the thermoplastic film prepared from polymer pellets, a thermosetting polythiourethane film (PTUMF) can be obtained by simple compression molding of PTUMs. Importantly, by mixing PTUMs with fillers and then compression molding, the composites with a segregated structure and excellent electrical conductivity can be fabricated. Such composites can be used as wearable strain sensors to monitor human motions. Notably, the preparation and molding of thermosetting polymer materials in this work are separated, which may be conducive to the development of industrial production.

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“…Furthermore, the limitations of molding and demolding processes hinder the attainment of complex shapes for thermoset PUs and make post-molding reshaping challenging. To solve the recycling and reprocessing issues of thermoset PUs, the incorporation of dynamic chemical bonds, such as disulfide, 26,27 thiourethane bond, [28][29][30][31] Diels-Alder adduct, [32][33][34] boronate ester bond, [35][36][37] oxime-carbamate bond 38,39 and others, into the cross-linked PU network is typically required.…”

Section: Introductionmentioning

confidence: 99%

Colorless, transparent, and shape memory polyurethane networks with high strength and recyclability

Ma,

Yue,

Huang

et al. 2023

J of Applied Polymer Sci

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The traditional thermoset polyurethanes (PUs) can be recycled through the dynamic carbamate bonds under specific conditions. However, there is limited research on the structural evolution and property changes of these PUs before and after recycling. Herein, we designed and fabricated a thermoset polyurethane network (PCU) using polyhexamethylene carbonate diol (PHMC‐diol) as soft segments, and isophorone diisocyanate (IPDI) and glycerol (GLY) as hard segments. Through careful formulation design, the PCU demonstrated colorless transparency (with up to 86% transmission), shape memory properties, and reprocessing capabilities, all achieved without introducing other dynamic covalent bonds. Furthermore, the PCU exhibited excellent mechanical properties, boasting a tensile strength of 59.2 ± 3.7 MPa and the elongation at break of 674.8 ± 37.3%. Of particular interest, the PCU samples displayed solid‐state plasticity and impressive shape memory performance, with shape fixity and recovery ratios exceeding 90%. Leveraging the combination of solid‐state plasticity and shape memory, the PCU samples demonstrated the ability to achieve arbitrary shape manipulations. Upon recycling, it was observed that the cross‐linking density of the PCU samples decreased, resulting in the formation of byproducts and subsequently leading to a reduction in tensile strength. Nonetheless, the PCU samples prepared in this study exhibit potential as thermadapt shape memory and recyclable materials.

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Thermal/Near‐Infrared Light Dual‐Responsive Reconfigurable and Recyclable Polythiourethane/CNT Composite with Simultaneously Enhanced Strength and Toughness

Cited by 4 publications

References 67 publications

Switchable Photothermal Conversion Efficiency for Reprogrammable Actuation

Switchable Photothermal Conversion Efficiency for Reprogrammable Actuation

Fully Closed-Loop Recyclable Thermosetting Polythiourethane Microspheres and Their Application in Efficient Fabrication of Composites with Segregated Structures

Colorless, transparent, and shape memory polyurethane networks with high strength and recyclability

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