Autonomous Self‐Healing Elastomers with Unprecedented Adhesion Force

Zhang, Zhen; Ghezawi, Natasha; Li, Bingrui; Ge, Sirui; Zhao, Sheng; Saito, Tomonori; Hun, Diana; Cao, Pengfei

doi:10.1002/adfm.202006298

Cited by 78 publications

(90 citation statements)

References 80 publications

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“…Existing elastomers are used in numerous applications, including tires, textiles, coatings, actuators, wearable electronics, just to name a few. According to the specific purpose, elastomers can be designed to possess specific properties such as adhesiveness, [ 14,15 ] self‐healing capability, [ 16–19 ] insulation performance, ionic conductivity, [ 20–22 ] etc. Besides endowing elastomers with novel functions, a timeless topic is how to toughen them, because excellent mechanical performance especially strength and toughness always determine the reliability of relevant applications.…”

Section: Introductionmentioning

confidence: 99%

Recent Progress in Double Network Elastomers: One Plus One is Greater Than Two

Yang

Tang

et al. 2022

Adv Funct Materials

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Human beings cannot live without elastomers, which exist almost everywhere in human life nowadays. Although elastomers with a variety of features are developed for specific applications, a timeless topic is how to toughen them, because mechanical properties always determine the reliability and lifespan of the utilized elastomers. Toughening of a soft material has a long history and the main idea is widely accepted, i.e., building energy dissipation into the stretchy networks. Double network (DN) method is the most pioneering and representative practice of materials toughening, which is successfully applied to numerous hydrogel systems. Intensive studies on DN hydrogel systems are implemented and relevant reviews are well documented, whereas important reviews about DN elastomers are absent. In this review, recent progress on toughening elastomers using the DN strategy is reviewed. By reviewing the fabrication methods and relevant extensions, toughening mechanisms at different length scales, functionalities, and applications in sequence, it is shown how one polymer network plus another gives rise to a tough elastomer with superior mechanical properties. It is believed that this review can give some insight into existing DN elastomer systems and inspire the development of next‐generation tough soft materials.

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Section: Introductionmentioning

confidence: 99%

Recent Progress in Double Network Elastomers: One Plus One is Greater Than Two

Yang

Tang

et al. 2022

Adv Funct Materials

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“…[ 19 , 20 ] However, achieving tough adhesion often comes at the expense of recyclability. [ 21 ] That is, tough adhesion is usually permanent, [ 22 , 23 , 24 ] and the elastomers can never be removed even when the devices reach their lifespan. Currently, a central challenge for elastomer adhesives is to combine reusability and tough adhesion, which allows environmental‐friendly recycling of devices without hampering their proper functioning during use.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, extremely strong bonding can be achieved by exploiting permanent links to connect substrates and elastomer adhesives. [ 22 ] For example, surface modification is often utilized to form irreversible covalent bonds between the elastomers and adherends, enabling the adhesives to sufficiently dissipate energy during interfacial separation. [ 31 ] Physical ways such as topological adhesion (a sort of mechanical interlocking) are also proven valid to form a permanent interface between the elastomer adhesive and substrates.…”

Section: Introductionmentioning

confidence: 99%

Tough, Instant, and Repeatable Adhesion of Self‐Healable Elastomers to Diverse Soft and Hard Surfaces

Zan

Tang

et al. 2022

Advanced Science

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Repeatability and high adhesion toughness are usually contradictory for common polymer adhesives. Repeatability requires temporary interactions between the adhesive and the substrate, while high adhesion toughness is usually achieved by permanent bonding. Integrating these two features into one adhesive system is still a daunting challenge. Here, the development of a series of viscoelastic elastomers composed of a soft and hard segment is reported, which exhibit tough, instant, yet repeatable adhesion to a variety of soft and hard surfaces. Such a combination of mutually exclusive properties is attributed to the synergy of high mobility of polymer chains and massive viscoelastic dissipation of the elastomers around the interface. By optimizing the relaxation time and mechanical dissipation, the resulting adhesives can achieve a tough yet repeatable adhesion toughness above 2000 J m −2 , superior to the best‐in‐class commercial adhesives. Numerous acrylate monomers are proven applicable to the preparation of such adhesives, validating the universality of the fabrication method. The application of these elastomers as adhesive and protective layers in soft electronics by virtue of their universal and tough adhesion to various soft and hard substrates is also demonstrated.

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“…Intermolecular hydrogen bonding can promote the rearrangement of polymer chain segments to induce the self-healing of the structure and properties of polymeric materials [ 25 ]. To verify the self-healing properties of PBAx–PDMS, the interfacial adhesion energy (IAE) of the prepared polymer was simulated in molecular simulations.…”

Section: Resultsmentioning

confidence: 99%

Highly Thermally Conductive Polymer/Graphene Composites with Rapid Room-Temperature Self-Healing Capacity

Chen

Sun

et al. 2022

Nano-Micro Lett.

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Composites that can rapidly self-healing their structure and function at room temperature have broad application prospects. However, in view of the complexity of composite structure and composition, its self-heal is facing challenges. In this article, supramolecular effect is proposed to repair the multistage structure, mechanical and thermal properties of composite materials. A stiff and tough supramolecular frameworks of 2-[[(butylamino)carbonyl]oxy]ethyl ester (PBA)–polydimethylsiloxane (PDMS) were established using a chain extender with double amide bonds in a side chain to extend prepolymers through copolymerization. Then, by introducing the copolymer into a folded graphene film (FGf), a highly thermally conductive composite of PBA–PDMS/FGf with self-healing capacity was fabricated. The ratio of crosslinking and hydrogen bonding was optimized to ensure that PBA–PDMS could completely self-heal at room temperature in 10 min. Additionally, PBA–PDMS/FGf exhibits a high tensile strength of 2.23 ± 0.15 MPa at break and high thermal conductivity of 13 ± 0.2 W m−1 K−1; of which the self-healing efficiencies were 100% and 98.65% at room temperature for tensile strength and thermal conductivity, respectively. The excellent self-healing performance comes from the efficient supramolecular interaction between polymer molecules, as well as polymer molecule and graphene. This kind of thermal conductive self-healing composite has important application prospects in the heat dissipation field of next generation electronic devices in the future.

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Autonomous Self‐Healing Elastomers with Unprecedented Adhesion Force

Cited by 78 publications

References 80 publications

Recent Progress in Double Network Elastomers: One Plus One is Greater Than Two

Recent Progress in Double Network Elastomers: One Plus One is Greater Than Two

Tough, Instant, and Repeatable Adhesion of Self‐Healable Elastomers to Diverse Soft and Hard Surfaces

Highly Thermally Conductive Polymer/Graphene Composites with Rapid Room-Temperature Self-Healing Capacity

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