Self-Healing Silicone Elastomer with Stable and High Adhesion in Harsh Environments

Dai, Shengping; Li, Meng; Yan, Hao; Zhu, Hao; Hu, Haijuan; Zhang, Yixing; Cheng, Guanggui; Yuan, Ningyi; Ding, Jianning

doi:10.1021/acs.langmuir.1c02356

Cited by 21 publications

(16 citation statements)

References 42 publications

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“…It is proposed that water molecules can act as a medium to facilitate the formation of hydrogen bonds between the two urea groups. 37,44 The DMA test revealed PDMS 2:1 's glass transition temperature (T g ) as −116 °C (Figure S10). The low T g guarantees polymer chain mobility, facilitating selfhealing in challenging aquatic conditions, even at −20 °C.…”

Section: Amphibious Self-healing Capacitymentioning

confidence: 99%

3D Printing Self-Healing and Self-Adhesive Elastomers for Wearable Electronics in Amphibious Environments

Lai,

Wang,

Zhao

et al. 2024

ACS Appl. Mater. Interfaces

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To meet the demands of challenging usage scenarios, there is an increasing need for flexible electronic skins that can operate properly not only in terrestrial environments but also extend to complex aquatic conditions. In this study, we develop an elastomer by incorporating dynamic urea bonds and hydrogen bonds into the polydimethylsiloxane backbone, which exhibits excellent autonomous self-healing and reversible adhesive performance in both dry and wet environments. A multifunctional flexible sensor with excellent sensing stability, amphibious selfhealing capacity, and amphibious self-adhesive performance is fabricated through solvent-free 3D printing. The sensor has a high sensing sensitivity (GF = 45.1) and a low strain response threshold (0.25%) and can be used to detect small human movements and physiological activities, such as muscle movement, joint movement, respiration, and heartbeat. The wireless wearable sensing system assembled by coupling this device with a bluetooth transmission system is suitable for monitoring strenuous human movement in amphibious environments, such as playing basketball, cycling, running (terrestrial environments), and swimming (aquatic environments). The design strategy provides insights into enhancing the self-healing and self-adhesive properties of soft materials and promises a prospective avenue for fabricating flexible electronic skin that can work properly in amphibious environments.

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Section: Amphibious Self-healing Capacitymentioning

confidence: 99%

3D Printing Self-Healing and Self-Adhesive Elastomers for Wearable Electronics in Amphibious Environments

Lai,

Wang,

Zhao

et al. 2024

ACS Appl. Mater. Interfaces

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“…Not only such networks meet the constraints of materials self-repair mentioned above, but they also open new perspectives in terms of processability and ways to reuse/recycle the materials at its end of life. From a structural point of view, such materials can be prepared by considering various strategies such as the introduction of reversible covalent bonds, − physical interactions, − or a combination of the two. ,− …”

Section: Introductionmentioning

confidence: 99%

Extra-Soft Self-Healable Supramolecular Silicone Elastomers from Bis-Amide-PDMS Multiblock Copolymers Prepared by Aza-Michael Reaction

Fauvre

Fleury

Ganachaud

et al. 2023

ACS Appl. Polym. Mater.

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Silicone elastomers involving self-associating bis-amide groups were synthesized by aza-Michael addition between N,N′-methylenebis(acrylamide) and low molecular weight bis(3-aminopropyl)-terminated poly(dimethylsiloxane). In mild conditions that favor monoaddition (reaction of a primary amine) over diaddition (reaction of the resulting secondary amine), a library of non-crosslinked copolymers was prepared by tuning the vinyl-to-primary amine reactive function molar ratio. Almost no diadduct was observed for a reactive function molar ratio lower than 0.8, thus leading to linear polymers with predictable molecular weights. On the other hand, diaddition occurs at higher molar ratios such that polymers with some branches, high molecular weights, and large dispersity were synthesized. Regardless of the polymers considered, the amide groups develop some H-bond interactions as demonstrated by FTIR, leading to phase-separated domains, as revealed by DSC, which alters rheological and viscoelastic properties of the polymers. By increasing the molecular weight of the polymers, it was possible to turn the copolymers from viscoelastic liquids to viscoelastic solids and further to elastomers. Moreover, the latter material presents self-healing propensity at room temperature, which may be related to the diffusion of short chains, while the mechanical properties (strain and stress at break) are endowed by the long entangled linear-like chains, properties that are recovered after healing.

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“…Over the lifetime of a silicone material, damage inevitably occurs by handling, use, and/or environmental stresses. 30 As soon as the integrity of the material is compromised, it is often no longer of practical use and is typically discarded. With the synthesis of thermoplastic silicone materials, the serviceable lifetime of these materials can be extended.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Over the lifetime of a silicone material, damage inevitably occurs by handling, use, and/or environmental stresses . As soon as the integrity of the material is compromised, it is often no longer of practical use and is typically discarded.…”

Section: Introductionmentioning

confidence: 99%

Thymine-Modified Silicones: A Bioinspired Approach to Cross-Linked, Recyclable Silicone Polymers

Voigt,

Tucker,

Zelisko

2023

Biomacromolecules

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In DNA, thymine typically forms hydrogen bonds with adenine to hold two complementary strands together and to preserve the genetic code. While thymine is typically absent in RNA, a thymine−thymine hydrogen bonding structure is reminiscent of the wobble region in tRNA recognition, where noncanonical base pairing can occur. This noncanonical base pairing can be applied to synthetic polymer systems, where thymine is free to hydrogen bond with itself. In this work, the natural hydrogen bonding capacity of thymine was used to produce silicone polymer systems designed to be cross-linked by hydrogen bonds. Backbone and end-group-modified silicones were synthesized with differing concentrations of thymine, which facilitated the cross-linking of the polymeric strands. Removing the hydrogen on N3�which is typically involved in hydrogen bonding�resulted in systems with similar viscosities to the starting material and that were devoid of any apparent cross-links. Differential scanning calorimetry (DSC) studies of the thymine-modified polymers displayed thermal absorptions and releases, indicative of bond breaking and reformation, around 100 and 60 °C, respectively. The cycle of bond breaking and formation could be repeated without any noticeable degradation of the chemical structure of the polymers. These polymeric materials could be readily recycled and remolded by heating them at 110 °C for 5 min, followed by cooling to room temperature, confirming their thermoplastic nature.

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Self-Healing Silicone Elastomer with Stable and High Adhesion in Harsh Environments

Cited by 21 publications

References 42 publications

3D Printing Self-Healing and Self-Adhesive Elastomers for Wearable Electronics in Amphibious Environments

3D Printing Self-Healing and Self-Adhesive Elastomers for Wearable Electronics in Amphibious Environments

Extra-Soft Self-Healable Supramolecular Silicone Elastomers from Bis-Amide-PDMS Multiblock Copolymers Prepared by Aza-Michael Reaction

Thymine-Modified Silicones: A Bioinspired Approach to Cross-Linked, Recyclable Silicone Polymers

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