Recycling of dielectric electroactive materials enabled through thermoplastic PDMS

Jeong, Seong-Hyeon; Skov, Anne Ladegaard; Daugaard, Anders Egede

doi:10.1039/d2ra00421f

Cited by 4 publications

(4 citation statements)

References 32 publications

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“…Hot‐pressing of PDMS, even with the facilitation of dynamic interaction, often operates at 100–180 °C. [ 22,24,30 ] This mechanical recycling approach may not be suitable for advanced sensor systems, for example, PDMS with insoluble carbon addictive. [ 23 ] Herein, we presented an alternative approach to achieve closed‐loop recycling, acid‐facilitated solvolysis, [ 31 ] where the studied polymer, TA‐SG 10‐0.7% , not only exhibited robust sensing performance but also was capable of recycling and reusing.…”

Section: Resultsmentioning

confidence: 99%

“…PDMS is classically being reproduced by hot‐pressing. [ 24,30 ] This high temperature‐dependent physical recycling process might irreversibly deteriorate its mechanical properties, and for those reinforced by carbon black/carbon nanotubes, recycling could even lead to dysfunction due to the uneven redistribution of the carbon addictive within the PDMS film. [ 23 ] Thereby, it is of high esteem that the exploration of potential polymeric systems, which should ideally be one single system, capable of tackling all the requirements to achieve robust pressure sensing, is constantly attempted.…”

Section: Introductionmentioning

confidence: 99%

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A Rational Design of Bio‐Derived Disulfide CANs for Wearable Capacitive Pressure Sensor

Yang,

Zhao,

Yang

et al. 2024

Advanced Materials

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Classic approaches to integrate flexible capacitive sensor performance are to on‐demand microstructing dielectric layers and to adjust dielectric material compositions via the introduction of insoluble carbon additives (to increase sensitivity) or dynamic interactions (to achieve self‐healing). However, the sensor's enhanced performances often come with the increased material complexity, discouraging its circular economy. Herein, we introduce a new intrinsic self‐healable, closed‐loop recyclable dielectric layer material, a fully nature‐derived dynamic covalent poly(disulfide) decorated with rich H bonding and metal‐catechol complexations. The polymer network possesses a mechanically ductile character with an Arrhenius‐like dependent viscoelasticity. The assembled capacitive pressure sensor is able to achieve a sensitivity up to 9.26 kPa−1, fast response/recovery times of 32/24 ms, and could deliver consistent signals of continuous consecutive cycles even after being self‐healed or closed‐loop recycled for real‐time detection of human motions. This is expected to be of high interest for current capacitive sensing research to move towards a life‐like, high performance and circular economy direction.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Rational Design of Bio‐Derived Disulfide CANs for Wearable Capacitive Pressure Sensor

Yang,

Zhao,

Yang

et al. 2024

Advanced Materials

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“…In recent years, several green cross-linking systems have been reported (azidoalkyl cycloaddition, boron ester, Diels–Alder, etc.). Amino-functionalized polydimethylsiloxanes have attracted considerable interest from researchers due to their strong reactivity , and the availability of polymers of different molecular weights and functionalities for commercial use. − It allows catalyst-free cross-linking with a variety of cross-linkers, such as Aza-Michael reactions, − ureas from reaction with isocyanates, , and imine bonding through reaction with aldehydes . However, even though these reactions are already catalyst-free cross-linking systems, the adhesion properties of the prepared elastomers are relatively poor.…”

Section: Introductionmentioning

confidence: 99%

Bioinspired High-Performance Silicone Elastomers by Catalyst-Free Dopamine Cross-Linking

Liu,

Hu,

Zheng

et al. 2024

Ind. Eng. Chem. Res.

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Silicone elastomers, as good sealants and adhesives, have been widely applied in protective coatings, architectural decoration, electronic packaging, and other fields. However, the traditional cross-linking of silicone elastomers is highly dependent on toxic catalysts or heavy metals, which may inevitably lead to severe environmental pollution. Moreover, most silicone elastomers suffer from a poor adhesive performance. In this study, inspired by the high adhesion properties of mussels, an eco-friendly and catalyst-free silicone elastomer with high adhesion properties was prepared by using dopamine as a cross-linker and amino-functionalized polysiloxane as a base. Under mild conditions (pH = 8.5), dopamine was self-polymerized and underwent Michael addition and Schiff base reactions with amino groups to form robust elastomers. It was found that the cross-linking degree gradually increases with the dopamine content increasing from 2 to 6%, and the solvent resistance and thermal stability exhibit significant improvement. Meanwhile, the tensile strength increased by 245% from 0.22 to 0.77 MPa. Especially, the as-obtained silicone elastomers have excellent adhesion to different materials. The lap shear strength with aluminum substrates (1.09 MPa) is 3.6 times higher than that of conventional silicone elastomers. The development of catalyst-free bioinspired silicone elastomers with high adhesion may shed light on the research of eco-friendly silicone materials and offer innovative insight for mussel-inspired adhesives.

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“…Elastomers are widely used as substrates for fabricating flexible electronic devices − as they possess excellent resilience performance and allow for excellent conformal contact with the body or internal organ surfaces to enable strain sensing with high sensitivity for potential applications in soft robotics, human–machine interfaces5, − and healthcare. − Electronic waste generated after service failure from wearable flexible devices causes serious pollution and has attracted widespread attention and deserves to be disposed of. Thermoplastic elastomer − with physical cross-linking via supramolecular interaction such as hydrogen bonding, − metal coordination, − and ionic interaction or microphase separation structures combined − by these interactions have been widely employed to fabricate healable and recyclable wearable electronic devices, but at the expense of sacrificing the resilience performance and creep resistance which has a big influence on the sensitivity and service stability of the fabricated devices. Chemical cross-linking of the elastomer via covalent bonds is capable of improving the resilience and dimension stability, but the challenge remains in achieving the recycling of the devices after service failure.…”

Section: Introductionmentioning

confidence: 99%

Room-Temperature Dynamic and Creep-Resistant Covalent Adaptive Networks via Phase-Locked Benzimidazole Urea Bonds: Toward Recyclable Elastomers for Wearable Electronic Devices

Xie,

Wang,

Lai

et al. 2023

ACS Sustainable Chem. Eng.

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The rapid development of flexible electronic devices has resulted in serious electronic pollution, which has aroused great attention in recent years. This study focuses on the development of dynamic cross-linking poly(dimethylsiloxane) (PDMS) elastomers with covalent adaptive network structures that can be recycled by a solvolytic approach to address this challenge. The elastomer is prepared through the addition reaction between amine-terminated PDMS, isophorone diisocyanate, and 2-aminobenzimidazole followed by cross-linking with hexamethylene diisocyanate trimer. The secondary ureidobenzimidazole (SUBI) moieties formed by benzimidazole and isocyanate groups can undergo a six-memberedring transition state, enabling automatic dissociation and reformation character at room temperature. Hydrogen-bonded aggregates formed by SUBI moieties work as physical cross-linking units to protect urea bonds from dissociation, which endows the materials with excellent creep-resistant performance. Decomposition of the aggregates by solvation, releasing the SUBI moieties, is mainly responsible for the recycling process. Wearable electronic devices with a microcrack structure for vibratory monitoring are assembled through 3D printing nanosilver paste onto the elastomer with predesigned structure. The excellent recycling performance can be transferred from the PDMS substrate to the devices, which enables the separation of PDMS and nanosilver, providing promising principles to develop facile degradable materials at room temperature for fabricating recyclable wearable electronic devices.

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Recycling of dielectric electroactive materials enabled through thermoplastic PDMS

Abstract: A new recycling method for silver-coated DEAs produced from thermoplastic elastomers. Recycled DEAs retain their dielectric and mechanical properties in five recycling loops in contrast to direct recycling that only permitted a single recycling loop.

Cited by 4 publications

References 32 publications

A Rational Design of Bio‐Derived Disulfide CANs for Wearable Capacitive Pressure Sensor

A Rational Design of Bio‐Derived Disulfide CANs for Wearable Capacitive Pressure Sensor

Bioinspired High-Performance Silicone Elastomers by Catalyst-Free Dopamine Cross-Linking

Room-Temperature Dynamic and Creep-Resistant Covalent Adaptive Networks via Phase-Locked Benzimidazole Urea Bonds: Toward Recyclable Elastomers for Wearable Electronic Devices

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