Strong, tough and healable elastomer nanocomposites enabled by a hydrogen-bonded supramolecular network

Li, Jiajun; Zhang, Ping; Chen, Lin; Li, Gaoming; Chen, Hao; Jia, Chunhui; Wu, Yeping; Chen, Mao; Zhao, Xiuli; Song, Pingan

doi:10.1016/j.coco.2020.100530

Cited by 28 publications

(12 citation statements)

References 26 publications

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“…The origin of this is that the relaxation process is dominated by thermally activated DERs that are accelerated at higher temperatures. Higher temperatures also favor the motion of the polymer chains, facilitating contact of the disulfide bonds or β-hydroxyl ester bonds. − …”

Section: Resultsmentioning

confidence: 99%

Fully Biobased Elastomer Composites with Mechanically Robust, Reprocessable, and Biocompatible Properties

Zhao

Yang

Dong

et al. 2021

ACS Appl. Polym. Mater.

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It is of importance, though difficult, to integrate reinforcement, functionalization, and recyclability into elastomeric materials. Here we describe a biomass-derived epoxidized natural rubber (ENR) cross-linked with dynamic covalent bonds and reinforced with functional carboxymethyl chitosan (CMCS). The ENR/CMCS composites show enhanced mechanical properties and thermal stability, due to the uniform dispersion of the CMCS fillers and strong interfacial interaction between the ENR matrix and fillers. These cross-linked rubbers can undergo topological network rearrangements through dynamic exchange reactions, endowing the materials with reprocessability and recyclability. Due to the biologically derived and green features of the both polymeric matrix and filler, the fully biobased ENR/CMCS composites also show excellent biocompatibility, which will expand their application in the field of biomaterials.

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Section: Resultsmentioning

confidence: 99%

Fully Biobased Elastomer Composites with Mechanically Robust, Reprocessable, and Biocompatible Properties

Zhao

Yang

Dong

et al. 2021

ACS Appl. Polym. Mater.

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“…The higher crosslinking density of ENR/BN-COOH/GO resulted in the enhancement of the mechanical performance and strong confinement to ENR chain mobility. 34 Based on the above analysis, covalent crosslinking was successfully constructed through the reaction between epoxy groups on ENR and carboxyl groups on BN-COOH in the ENR/BN-COOH/GO rubber system, as shown in Figure 3c.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Recyclable, Self-Healing, and Highly Thermal Conductive Natural Rubber Nanocomposites Enabled by a Dynamic Covalent Network with Carboxylated Boron Nitride Nanosheets

Gong

Guo

et al. 2023

ACS Sustainable Chem. Eng.

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It is of great significance for saving resources and protecting the environment to endow rubber with excellent recycling ability. Recyclable and self-healing ENR/BN-COOH/GO nanocomposites were prepared through dynamic covalent crosslinking between epoxidized natural rubber (ENR) and carboxylated boron nitride (BN-COOH), and graphene oxide (GO) was used as a reinforcing filler. The constructed dynamic β-hydroxyl ester bond between ENR and BN-COOH resulted in the remarkable enhancement of interfacial interaction and effective energy dissipation, which contributed to good mechanical properties of the nanocomposites, increasing by 116 and 79% in comparison with ENR and ENR/GO, respectively. An exchangeable β-hydroxyl ester bond could regulate a network topology structure via a transesterification reaction at the interface, endowing ENR with desirable recycling and self-healing ability. Moreover, the significant improvement of thermal conductivity for ENR/BN-COOH/GO nanocomposites was achieved, reaching 2.853 W/(m·K) at only 6 wt % BN-COOH content, indicating the formation of effective thermal conductive paths via the β-hydroxyl ester bond and hybrid thermal conductive network of BN-COOH/GO. Meanwhile, the thermal conductivity of recycled samples still maintained a high level due to the construction of the stable thermal conductive network. Such a facile strategy exhibits a promising perspective in preparing recyclable and highly thermal conductive rubber nanocomposites for applications in efficient thermal management fields.

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“…Density functional theory (DFT) was applied to perform specific computational studies on the hydrogen bonding between CT-HEP and TA. , Geometric optimization of molecular structures and single-point energy calculations during the simulation were performed based on the B3LYP/6-31G* theory utilizing the Gaussian 09 package. Notably, the experiments employ only one repeating unit of CT to acquire reasonable data about hydrogen bonding ((TA)–O and H–O (CT), (TA)–H and O–(CT)) so as to facilitate the simulation procedure.…”

Section: Resultsmentioning

confidence: 99%

“…29 Density functional theory (DFT) was applied to perform specific computational studies on the hydrogen bonding between CT-HEP and TA. 30,31 Geometric optimization of molecular structures and single-point energy calculations…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Biobased Reversible Cross-Linking Enables Self-Healing and Reprocessing of Epoxy Resins

Wang

Feng

Pei

et al. 2022

ACS Sustainable Chem. Eng.

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The rapid development of thermosetting polymers contributes strongly to environmental pollution, petrochemical resource consumption, and increasing carbon dioxide emission. Introducing a reversible supramolecular cross-linking network into the thermosetting polymer to endow it with reprocessability and self-healing ability is highly attractive for the reduction of fossil fuel consumption. Despite the tremendous advancement in recyclable thermosetting polymers, using biobased materials to construct reversible cross-links, which can realize the high biomass carbon content of materials, remains challenging. Here, we present a selfhealing and reprocessable epoxy resin enabled by biobased multiple hydrogen bonds between biological tannic acid and chitosan. The binding energy simulation demonstrates that effective hydrogen bonds are constructed in the epoxy resin. The resultant supramolecular cross-linked epoxy resin shows improved mechanical properties (tensile strength increased by two times, toughness increased by 2.7 times), high self-healing efficiency (104% toughness recovery) at room temperature, and excellent reprocessability (109% toughness recovery). We envision that the proposed biobased reversible cross-linking strategy will be useful in the greening and recycling of various thermosetting polymers, such as rubbers, crosslinked plastics, etc.

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Strong, tough and healable elastomer nanocomposites enabled by a hydrogen-bonded supramolecular network

Cited by 28 publications

References 26 publications

Fully Biobased Elastomer Composites with Mechanically Robust, Reprocessable, and Biocompatible Properties

Fully Biobased Elastomer Composites with Mechanically Robust, Reprocessable, and Biocompatible Properties

Recyclable, Self-Healing, and Highly Thermal Conductive Natural Rubber Nanocomposites Enabled by a Dynamic Covalent Network with Carboxylated Boron Nitride Nanosheets

Biobased Reversible Cross-Linking Enables Self-Healing and Reprocessing of Epoxy Resins

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