Noncovalently Cross-Linked Polymeric Materials Reinforced by Well-Designed In Situ-Formed Nanofillers

Li, Yixuan; Wang, Xiaohan; Xu, Fang; Sun, Junqi

doi:10.1021/acs.langmuir.2c01380

Cited by 11 publications

(9 citation statements)

References 71 publications

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“…16,21,24,25 However, the mechanical strengths of these elastomers are usually lower than those of the covalently crosslinked ones, which largely restricts their application. 41,42 Therefore, it remains a great challenge to integrate excellent mechanical properties such as high tensile strength, elasticity, and satisfactory scratch/damage resistance into one healable/ recyclable elastomer. Additionally, these elastomers should be easily decorated with functional species to obtain desirable functions.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Moreover, by incorporating dynamically cross-linked nanostructures, we fabricated poly(dimethylsiloxane) (PDMS) and poly(caprolactone) (PCL)-based PU elastomers that exhibit excellent damage resistance with a fracture energy of ∼192.9 kJ·m –2 and toughness of ∼363.8 MJ·m –3 . Cross-linking polymer chains with reversible supramolecular interactions provides a widely used procedure for the construction of reversibly cross-linked healable and recyclable elastomers. ,,, However, the mechanical strengths of these elastomers are usually lower than those of the covalently cross-linked ones, which largely restricts their application. , Therefore, it remains a great challenge to integrate excellent mechanical properties such as high tensile strength, elasticity, and satisfactory scratch/damage resistance into one healable/recyclable elastomer. Additionally, these elastomers should be easily decorated with functional species to obtain desirable functions.…”

Section: Introductionmentioning

confidence: 99%

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Healable, Recyclable, and Scratch-Resistant Polyurethane Elastomers Cross-Linked with Multiple Hydrogen Bonds

Yang

Wang

et al. 2023

ACS Appl. Polym. Mater.

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Despite the rapid development of elastomers as safeguard materials, efforts remain to be made to further improve their comprehensive mechanical properties and endow them with healing and recycling capacities. Herein, mechanically robust, healable, recyclable, and scratch-resistant polyurethane (PU) elastomers are successfully fabricated by dynamically cross-linking PU chains with multiple hydrogen bonds, which are derived from the carbamate, carboxylic acid, and 2-ureido-4-[1H]-pyrimidinone (UPy) groups. The resultant elastomers (denoted as PU-UPy-DPA) are highly elastic and exhibit a high tensile strength of ∼73.6 MPa and toughness of ∼257.2 MJ m −3 . The excellent comprehensive mechanical properties endow the PU-UPy-DPA elastomers with excellent scratch-resistant and tear-tolerant capacities to improve their long-term durability. Owing to the reversibility of hydrogen bonds among the PU chains, the PU-UPy-DPA elastomers can be conveniently healed and recycled under heating to restore their original mechanical properties. Additionally, the PU-UPy-DPA elastomers can be homogeneously loaded with organic dyes and luminescent nanoparticles to gain desired colors and luminescence, which helps to extend their application ranges.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Healable, Recyclable, and Scratch-Resistant Polyurethane Elastomers Cross-Linked with Multiple Hydrogen Bonds

Yang

Wang

et al. 2023

ACS Appl. Polym. Mater.

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“…Materials made by assembling macromolecules have an advantage: a series of materials with different physical properties, such as mechanical strength, can be obtained without the chemical modification of the polymers, depending on the features of the assembly (assembling states). , If natural polymers can be used for such purposes, natural resources can be effectively used, thereby expanding their versatility as biocompatible materials. − In this regard, natural polysaccharides are promising polymers because of their abundance in nature. For example, glycosaminoglycans, a series of acidic polysaccharides, are promising biomaterials because of their physical and biochemical properties. − …”

Section: Introductionmentioning

confidence: 99%

Preparation of Mechanically Anisotropic Polysaccharide Composite Films Using Roll-Press Techniques

et al. 2023

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Natural polysaccharides are biocompatible and biodegradable; therefore, they can be used as feedstock for biodegradable structural materials and biomaterials. In this study, anisotropic polysaccharide composite films consisting of chondroitin sulfate C (CS) and chitosan (CHI) were fabricated from their polyion complex (PIC) gels by roll-press techniques. The obtained films (CS/CHI films) were thin and transparent, similar to the composite films prepared by hot-press techniques. The roll-press conditions were optimized, and it was observed that the molecular weight of CHI did not significantly affect the formability of the films, whereas the roll temperature and rolling speed were important. The tensile tests of the roll-pressed films revealed that the mechanical strength of the films in the mechanical direction (MD) was approximately 5 times higher than that in the transverse direction (TD), indicating that the roll-press techniques imparted mechanical anisotropy to the films. Additionally, the films shrank in the MD and expanded in the TD after immersion in aqueous solutions, followed by drying. Such anisotropic shrinking and expanding properties indicate that these films can be used as shape-memory materials.

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“…Based on dynamic covalent bonds − and reversible noncovalent interactions, − healable materials have been widely concerned because of their capability to extend service life and improve product reliability and durability. A high temperature often promotes the healing process of damaged products, especially for some materials based on dynamic covalent bonds that require high temperatures to activate the healing process. , However, applying heat to the whole product for minor or single damage is a great waste of energy and increases labor costs.…”

Section: Introductionmentioning

confidence: 99%

Flexible Photothermal Materials with Controllable Accurate Healing and Reversible Adhesive Abilities

et al. 2023

Macromolecules

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As one of the first studied photothermal agents, eumelanin is often used for photothermal materials based on its broadband light absorption ability, biocompatibility, and cheap availability. However, it is still a challenge to conduct in-depth development of the photothermal effect of eumelanin in flexible polymeric composites due to its dispersion problem. Here, we report light-controlled healable and reversible adhesive elastomers using polar liquid cross-linkers to assist eumelanin dispersion into carboxylic styrene butadiene rubber (XSBR). The uniformly dispersed eumelanin and the coordination between Zn2+ and eumelanin bring the elastomer a satisfactory photothermal conversion efficiency (80%), even if only 1 phr eumelanin is added. Under near-infrared (NIR) laser irradiation of 0.55 W cm–2, the temperature of the elastomer with 1 phr eumelanin sharply increases from room temperature to 120 and ∼190 °C (the maximum temperature) in 20 and 90 s, respectively. Benefiting from the efficient photothermal conversion ability and transesterification, the elastomer shows excellent NIR light-controlled healing ability, and its healing efficiency can reach 94%. Based on noncovalent interactions (mainly hydrogen bonds), the elastomer shows temperature-dependent reversible adhesive behavior. The adhesion strength of the elastomer can be adjusted by changing the temperature or irradiating light, thus facilitating the disassembly and reuse of the elastomers. Thanks to these advantages, the obtained elastomers have potential applications in harvesting sunlight for electricity generation and also provide insights into the development of sustainable reversible adhesive materials.

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Noncovalently Cross-Linked Polymeric Materials Reinforced by Well-Designed In Situ-Formed Nanofillers

Cited by 11 publications

References 71 publications

Healable, Recyclable, and Scratch-Resistant Polyurethane Elastomers Cross-Linked with Multiple Hydrogen Bonds

Healable, Recyclable, and Scratch-Resistant Polyurethane Elastomers Cross-Linked with Multiple Hydrogen Bonds

Preparation of Mechanically Anisotropic Polysaccharide Composite Films Using Roll-Press Techniques

Flexible Photothermal Materials with Controllable Accurate Healing and Reversible Adhesive Abilities

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