Molecular engineering of a colorless, extremely tough, superiorly self-recoverable, and healable poly(urethane–urea) elastomer for impact-resistant applications

Wang, Dong; Wang, Zhifeng; Ren, Shangyang; Xu, Jianhua; Wang, Cheng; Hu, Po; Fu, Jiajun

doi:10.1039/d1mh00548k

Cited by 147 publications

(127 citation statements)

References 58 publications

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“…Immense efforts have been taken to strengthen and toughen elastomers, including the introduction of nanocomposite, [ 23–27 ] multiple cross‐linking, [ 28–32 ] phase separation, [ 33–36 ] ionic coordination, [ 37–40 ] supramolecular interactions, [ 41–46 ] and double network (DN) structures, [ 47–51 ] etc. For instance, Zhang et al.…”

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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“…The Fu group prepared a colorless, tough and healable poly(urethane‐urea) elastomer by introducing a large number of urea groups into the hard domains using IPDI (Figure 2d). [ 90 ] Through the irregular stacking of a large number of hydrogen bonds, the strengthening of the dynamic hard domain is achieved at the molecular level, leading to the remarkably increase in stiffness, strength, toughness, and fracture energy, while maintaining the dynamic characteristics of the hard domain. The elastomer exhibits a record‐high toughness of 503.3 MJ m −3 and a dissipated energy of 37.3 MJ m −3 .…”

Section: Self‐healing Polymers Based On Dynamic Bondsmentioning

confidence: 99%

“…d) Synthetic routes of poly(urethane-urea) elastomer and the schematic illustration of chemical structures of hard domains. Reproduced with permission [90]. Copyright 2021, Royal Society of Chemistry.…”

mentioning

confidence: 99%

Progress in Utilizing Dynamic Bonds to Fabricate Structurally Adaptive Self‐Healing, Shape Memory, and Liquid Crystal Polymers

Zhang

Wang

et al. 2022

Macromol. Rapid Commun.

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Stimuli‐responsive structurally dynamic polymers are capable of mimicking the biological systems to adapt themselves to the surrounding environmental changes and subsequently exhibiting a wide range of responses ranging from self‐healing to complex shape‐morphing. Dynamic self‐healing polymers (SHPs), shape‐memory polymers (SMPs), and liquid crystal elastomers (LCEs), which are three representative examples of stimuli‐responsive structurally dynamic polymers, have been attracting broad and growing interest in recent years because of their potential applications in the fields of electronic skin, sensors, soft robots, artificial muscles, and so on. Recent advances and challenges in the developments toward dynamic SHPs, SMPs, and LCEs are reviewed, focusing on the chemistry strategies and the dynamic reaction mechanisms that enhance the performances of the materials including self‐healing, reprocessing, and reprogramming. The different dynamic chemistries and their mechanisms on the enhanced functions of the materials are compared and discussed, where three summary tables are presented: A library of dynamic bonds and the resulting characteristics of the materials. Finally, a critical outline of the unresolved issues and future perspectives on the emerging developments is provided.

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“…This was attributed to the dissociation and the re-formation of hydrogen bonding in modified elastomer. 23,36 Specifically, due to the binding effect of hydrogen bonding, the C═O stretching vibration frequency shifted to lower values, while it became higher again because of the dissociation of hydrogen bonding resulted from the increase in temperature. These results clearly demonstrated the construction and the dynamic nature of hydrogen bonding network in POE-(GMA-NAg) 50 .…”

Section: Construction Of Hydrogen Bonding In Poe-(gma-nag) X Elastomermentioning

confidence: 99%

Modified ethylene/α‐octene co‐polymer composites based on dual toughening of hydrogen bonding network and nanospheres

Huang

Liao

Liu

et al. 2022

Polymers for Advanced Techs

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Thermoplastic elastomer ethylene/α-octene co-polymer (POE) is a special polymer material with both elasticity and thermoplasticity. However, the nonpolarity and lowtensile strength of POE limit its application in polar materials and high-strength materials fields. In this study, we synthesized a specific molecule with C═C bonds and N H bonds, which was introduced into POE to construct hydrogen bonding network, and the prepared modified POE is further blended with carboxyl terminated polystyrene nanospheres as toughening agent to prepare modified POE elastomer composites. Based on such dual toughening strategy containing chemical modification and physical toughening, the modified POE elastomer composites possess improved mechanical properties. The composites achieve a tensile strength of 21.4 MPa, elongation at break of 1268%, fracture energy of 109.6 MJÁm À3 and exhibit improved thermal stability. Impressively, the tensile strength of reprocessed composites is restored to more than 90% of their original tensile strength even after four times of reprocessing steps, demonstrating excellent reusability.

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Molecular engineering of a colorless, extremely tough, superiorly self-recoverable, and healable poly(urethane–urea) elastomer for impact-resistant applications

Abstract: Polyurethane or polyurea elastomers with superb mechanical strength and toughness, good self-recoverability and healable characteristics are of key significance for practical applications. However, some mutually exclusive conflicts among these properties...

Cited by 147 publications

References 58 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

Progress in Utilizing Dynamic Bonds to Fabricate Structurally Adaptive Self‐Healing, Shape Memory, and Liquid Crystal Polymers

Modified ethylene/α‐octene co‐polymer composites based on dual toughening of hydrogen bonding network and nanospheres

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