A self-healing and energy-dissipating impact-hardening polymer based on a variety of reversible dynamic bonds

Wen, Haolijie; Sun, Jie; Yu, Kejing; Yang, Xiaoning; Dai, Xiaoqing; Zhang, Zhongwei

doi:10.1016/j.matdes.2023.112057

Cited by 7 publications

(2 citation statements)

References 41 publications

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“…Furthermore, the storage and loss modulus of the elastomers gradually decrease with increasing temperature, indicating that the enhancement of elastomeric chain flexibility is attributed to the dissociation of reversible dynamic bonds. 27 In the range of 30−110 °C, the storage modulus is always larger than the loss modulus for all elastomers, indicating that the elastomers are viscoelasticdominated elastomeric materials at low temperatures, which is a typical characteristic of cross-linked networks.…”

Section: ■ Experimental Sectionmentioning

confidence: 94%

“…26 The weight loss rates of the Cu-RPOUIP, Cu-RPOUH, Cu-RPOUT, and Cu-POUT elastomers in the first stage are 1.7, 1.1, 1.7, and 2.1%, respectively, which are smaller than the theoretical weight percentages of DMG in the corresponding elastomers (4.29, 4.59, 4.55, and 4.77%, respectively) because the N atoms in DMG and Cu 2+ form coordination compounds, which increase the cross-linking degree of the polymer, thereby restricting chain movement and improving the thermal stability of the elastomer. 27 The second stage of weight loss occurs at approximately 325 °C, primarily because of the decomposition of hard segments. 28 The third stage of weight loss occurs at approximately 415 °C, which is the decomposition of the soft segments.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Multidynamic Poly(oxime–carbamate) Elastomers with Rosin Moieties

Xu,

Lu,

et al. 2024

ACS Appl. Polym. Mater.

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General thermoset materials are prone to hidden cracks and aging during use and have strong cross-linked network structures, resulting in a waste of resources due to the difficulty of recycling after use. The introduction of reversible covalent/noncovalent bonds into materials can impart self-healing and recyclable properties, thereby extending the life cycle of the materials, which is in line with the goal of sustainable development. In this study, we prepared a series of multidynamic poly(oxime−carbamate) elastomers derived from rosin, based on a synergistic reinforcement strategy of hydrogen, metal−ligand coordination, and oxime−carbamate bonds using acrylic rosin and glycidyl methacrylate ester as monomers. Furthermore, the thermal, mechanical, dynamic, self-healing, and recyclability properties of the elastomers were investigated. The results showed that the prepared poly(oxime−carbamate) elastomers had good thermal stability (T d5% > 235 °C), solvent resistance and self-healing properties (120 min of healing at 70 °C with 89.5 ± 1.8% self-healing efficiency), excellent tensile strength (19.3 ± 0.5 MPa), toughness (44.3 ± 1.5 MJ m −3 ), and good recyclability. Furthermore, strain sensors constructed by using these elastomers have high stability. This study provides a research basis for the development of high-performance biobased self-healing materials for wearable electronics and flexible electronics applications.

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Section: ■ Experimental Sectionmentioning

confidence: 94%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Multidynamic Poly(oxime–carbamate) Elastomers with Rosin Moieties

Xu,

Lu,

et al. 2024

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

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Study on mechanical properties and curing properties of shear‐thickening gel toughened epoxy resin

Ma,

Wen,

Wang

et al. 2024

Polymer Engineering & Sci

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The shear‐thickening gel (STG) is introduced as a toughening agent into the epoxy resin (EP) to improve the toughness and impact resistance of the EP without significantly increasing its viscosity. By utilizing the unique BO dynamic bonds present in STG, the EP/STG composite exhibits remarkable toughness at low strain rates due to the gradual disentanglement of molecular chains. Conversely, at high strain rates, the disentanglement of molecular chains is hindered, resulting in a pronounced impact hardening effect and overall superior impact resistance. Our findings reveal that when STG is added at a concentration of 15%, the EP/STG composite material attains its peak mechanical performance. Specifically, it demonstrates a tensile strength of 31.8 MPa and a modulus of elasticity of 550.6 MPa. Furthermore, compared to pure EP, the EP/STG composite experiences an increase in elongation at break and impact strength by 40% and 8.1%, respectively. Additionally, the introduction of hydroxyl and B atoms in STG promotes the ring‐opening reaction of epoxy groups during the curing process of the EP, thus accelerating the curing reaction rate. These insights provide a solid theoretical foundation for optimizing the performance of EPs in engineering applications.Highlights The STG was actively utilized to enhance the toughness of EP. The modified EP system exhibits significant improvements in toughness and impact resistance without a notable increase in viscosity. The promotional effect of STG on the curing of EP systems was revealed through curing kinetics analysis and rheological analysis.

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Chemical approaches for fabrication of self-healing polymers

Zafeer,

Bhat

2024

Discov Appl Sci

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In recent years, significant progress has been made in the development of polymeric materials, driving rapid expansion in associated industries and a surge in plastic production and usage. Consequently, the substantial generation of plastic waste has raised environmental concerns. One critical issue is the tendency of polymers to degrade over time, leading to disposal. Introducing self-healing systems capable of autonomously repairing damage caused by external factors can extend material lifespan, offering an effective means to mitigate polymer waste. The concept of self-healing draws inspiration from the regenerative abilities of living organisms. Extensive research over the past decade has led to significant advancements in self-healing materials, which can naturally repair and regain functionality using accessible resources. Various approaches, including physical, chemical, and physio-chemical methods, are employed in self-healing polymers. These self-healing mechanisms can be autonomic or triggered by external stimuli such as heat, solvent, or pressure. From thermosets to thermoplastics to elastomers, polymers of all types can exhibit self-healing properties. This review article delves into chemical approaches of fabricating self-healing synthetic polymers, focusing primarily on covalently cross-linked polymers with an emphasis on the Diels–Alder reaction. Additionally, the review offers a comprehensive discussion and compilation of different research works concerning other chemical approaches used in polymer self-healing.

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A self-healing and energy-dissipating impact-hardening polymer based on a variety of reversible dynamic bonds

Cited by 7 publications

References 41 publications

Multidynamic Poly(oxime–carbamate) Elastomers with Rosin Moieties

Multidynamic Poly(oxime–carbamate) Elastomers with Rosin Moieties

Study on mechanical properties and curing properties of shear‐thickening gel toughened epoxy resin

Chemical approaches for fabrication of self-healing polymers

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