Ultra-high-strength self-healing supramolecular polyurethane based on successive loose hydrogen-bonded hard segment structures

Xu, Huifang; Tu, Jing; Ji, Jie; Li, Liang; Li, Haozhe; Li, Pingyun; Zhang, Xinze; Gong, Qiongyao; Guo, Xiaode

doi:10.1016/j.eurpolymj.2022.111437

Cited by 18 publications

(3 citation statements)

References 57 publications

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“…Therefore, on balance, PU-L/Zn-3 is considered to be the optimal sample, combining high strength, toughness, stretchability, and rapid self-healing ability under mild conditions. To the best of our knowledge, having such high mechanical properties and the ability to repair damage quickly under mild conditions is uncommon in self-healing polyurea materials (Figure f). − In sum, the excellent self-healing properties of PU-L/Zn are attributed to the following factors: (1) the highly dynamic nature of the dense hydrogen bonds facilitates the contact of the two fractured surfaces; (2) the abundant free urea and pyridine ligands in the polymeric network provide plentiful coordination sites for unsaturated Zn 2+ to guarantee fast exchange kinetics of Zn(II)-coordination bonds; (3) the dynamic exchange character of Zn(II)-coordination bonds and hydrogen bonds facilitates to reduce the energy barrier of polymer chain mobility and increase the rate of chain dynamics; (4) the PPG molecular chains have high chain mobility, which means that chains can diffuse across the interface leading to entanglement such that the interface disappears and ultimately restores the properties of the material.…”

Section: Resultsmentioning

confidence: 99%

Mechanically Robust and Self-Healable Polyureas Based on Multiple Dynamic Bonds

Hao

Zhu

2023

Ind. Eng. Chem. Res.

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The synthesis of polymeric materials that simultaneously possess multiple outstanding mechanical properties and self-healability is always a great challenge. Herein, we report the synthesis of a robust and self-healing polyurea material, which contains a dual metal coordination structure of Zn(II)-urea and Zn(II)-diamidepyridine as well as dense hydrogen bonds. Due to the synergistic enhancement of dynamic coordination bonds and hydrogen bonds in the supramolecular network, the obtained polyurea materials possess a combination of excellent mechanical properties and high-efficiency self-healing properties, which are adjustable by varying the content of Zn(II) ions. The optimal PU-L/Zn-3 sample has a tensile strength of ∼22.82 MPa, while the elongation at break is ∼1312% and the toughness is ∼222.68 MJ/m 3 . In addition, the fully cut sample exhibits a high healing efficiency of 95.7% based on toughness after treatment at 50 °C for 4 h. Multi-dynamic cross-linked polymers might provide a new way to obtain robust self-healing materials for protection materials and wearable electronics.

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Section: Resultsmentioning

confidence: 99%

Mechanically Robust and Self-Healable Polyureas Based on Multiple Dynamic Bonds

Hao

Zhu

2023

Ind. Eng. Chem. Res.

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“…In recent years, polyurethane (TPU) has attracted more and more attention depending on its excellent mechanical and thermal properties, which are attributed to their molecular composition structure and phase separation morphology of soft and hard segments. − TPU can be widely used in architecture, military, aviation, and other fields, depending on the advantages of molecular structure variability and performance controllability. − The strength of thermoplastic polyurethane is crucial for its wider application, so many methods has been mentioned to improve the strength of TPU. − The depolymerases hydrolyzing lignin partially has been used to synthesize polyurethane elastomers successfully instead of petroleum-derived polyols, the strength and toughness of which have been enhanced obviously attributed to the double cross-linking network structure and interfacial hydrogen bonds . The tensile strength and elongation at break of polyurethane can be controlled by adjusting the proportion of soft and hard segment structures, but performance regulation is limited, and its light transmittance is often difficult to meet the application requirements .…”

Section: Introductionmentioning

confidence: 99%

Strength Enhancement of Polyurethane Film by Solution Annealing

Liu,

Zhan,

et al. 2024

Langmuir

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Recently, polyurethane elastomer (TPU) has attracted more and more attention depending on its excellent optical, mechanical, and retreatment properties. The high strength of polyurethane has always been pursued, which can enable its application in more fields. In this work, an aliphatic polyurethane elastomer membrane (HRPU6) was successfully synthesized, and its strength was obviously improved by solvent annealing technology. The tensile strength and adhesion strength can reach 64.56 and 2.58 MPa, but 36.55 and 1.57 MPa only before solvent annealing, respectively. The impact strength of laminated glass based on HRPU has also been significantly improved after solvent annealing, confirmed through drop ball impact testing. It has been confirmed that the increase in strength of HRPU6 is attributed to the enhancement of hydrogen bonding and the improvement of the phase separation degree.

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“…Therefore, it is necessary to study the relationship between the chemical structures of the components to improve their properties and obtain new materials with specific applications. [1][2][3][4][5] The physical characteristics necessary in the specific application of the polymeric material must be provided by the components used for the synthesis of the polyurethanes. The structures of the soft segment and especially of the hard segment affect the properties because they act together on the degree of phase separation, crystallization, morphology and hydrogen bonds.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of water‐dispersible polyurethanes based on various diisocyanates and PEG as the hard segment

Oprea¹,

Potolinca²

2023

J of Applied Polymer Sci

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Water‐dispersible polyurethanes are a greener alternative to polyurethane solutions in organic solvents. Various polyurethane materials were prepared by a two‐step polymerization procedure of polypropylene glycol with Mn of 2000, polyethylene glycol with Mn of 1500, and diisocyanates with different chemical structures, aliphatic, cycloaliphatic and aromatic. It was investigated how the diisocyanate structure affected the molecular morphology, contact angle measurements, and physical characteristics of water‐dispersible polyurethanes. FTIR and NMR measurements showed a close relationship between the intermolecular connections and the hard segment structure, mainly of the diisocyanate used. Also, the polarized light method showed that the presence of the PEG in the hard domain improved aggregation through physical interactions due to its structural flexibility and mobility. These water‐dispersible polyurethanes can assure the use of these polyurethane materials in a broad range of applications with increased environmental protection.

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Ultra-high-strength self-healing supramolecular polyurethane based on successive loose hydrogen-bonded hard segment structures

Cited by 18 publications

References 57 publications

Mechanically Robust and Self-Healable Polyureas Based on Multiple Dynamic Bonds

Mechanically Robust and Self-Healable Polyureas Based on Multiple Dynamic Bonds

Strength Enhancement of Polyurethane Film by Solution Annealing

Synthesis and properties of water‐dispersible polyurethanes based on various diisocyanates and PEG as the hard segment

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