A Robust and High Self‐Healing Efficiency Poly(Urea‐Urethane) Based on Disulfide Bonds with Cost‐Effective Strategy

Wang, Yulong; Li, Yaqiong; Bai, Jingjing; Li, Zhenzhong; Hu, Guosheng

doi:10.1002/macp.201900340

Cited by 11 publications

(3 citation statements)

References 34 publications

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“…To confirm their molecular structure, attenuated total reflectance-Fourier transform infrared (ATR-FTIR) and proton nuclear magnetic resonance (1H NMR) studies were conducted (Figures S4 and S5). The absorption peaks of the S–S bond and C–S bond observed in the Raman spectra (Figure S6) indicated the successful insertion of disulfide bonds on the polymer chain. , To demonstrate the impact of disulfide bonds on the crystallization of PCL segments, we synthesized PUU-EDA using nondisulfide bonds-containing ethylenediamine (EDA) as a chain extender (the corresponding FTIR and NMR spectra shown in Figures S7 and S8). Figures S9a,b demonstrate that the introduction of disulfide bonds hinders the strong crystallization tendency of PUU elastomers, which is highly advantageous for their application as matrices in flexible electronic devices …”

Section: Resultsmentioning

confidence: 99%

Construction of Mechanical Robust Elastomers by Simulating the Strengthening and Healing Process of Natural Skin toward Multifunctional Electronics

Zhang,

Wang,

Yang

et al. 2024

Macromolecules

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High-strength elastomers capable of room-temperature healing hold promising applications in flexible electronics. However, the unwanted spontaneous merging for the incorrect contact (such as folding or stacking) during the use process will prevent the widespread promotion of these elastomers. By simulating the strengthening and healing processes of natural skin, a series of robust and kinetically stable poly(urea-urethane) elastomers (PUU) were synthesized by integrating three reversible interactions, including dynamic disulfide bonds, hierarchical hydrogen bonds, and strain-induced crystallization, into polymer chains. Among these elastomers, PUU-DTDA9 exhibits high strength (40 MPa), exceptional transient room-temperature selfhealing ability (97.71% healing efficiency of tensile strength), and good kinetic stability (no merging occurs at the contact area after it is kept at room temperature for 24 h). The exchangeability of disulfide bonds was locked by the hydrogen bonds with moderate density in the polymer chains, ensuring a high kinetic stability of the elastomer under service conditions. This prevents undesired merging efficiently while gaining an excellent transient self-healing ability triggered by ethanol at room temperature. Furthermore, to simulate the ion transport capabilities of natural skin, PUU-DTDA9 was mixed with ionic liquid to prepare sensitive multifunctional ionic skin with high tensile strength (18 MPa) and excellent transient self-healing ability, showing promising potential in highperformance flexible wearable electronics.

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Section: Resultsmentioning

confidence: 99%

Construction of Mechanical Robust Elastomers by Simulating the Strengthening and Healing Process of Natural Skin toward Multifunctional Electronics

Zhang,

Wang,

Yang

et al. 2024

Macromolecules

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“…According to the above, among the four SPU samples, although the self-healing efficiency of SPU-4 is the lowest, the mechanical properties (fracture tensile strength of 19.5 MPa and elongation at break of 744%) of the healed sample is the best after heat treatment at 120 C, which is also standout compared to self-healing polyureas reported previously (Figure 8h). 11,16,20,[35][36][37][38][39][40]…”

Section: Mechanical and Self-healing Propertiesmentioning

confidence: 99%

A high‐performance self‐healing polyurea material based on exchangeable aromatic disulfide

Hao

Zhu

et al. 2022

J of Applied Polymer Sci

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High-performance polyurea materials demonstrate promising applications in the field of aerospace, military, etc. During processing and use, however, the formation of cracks may cause serious degradation of material properties. Selfhealing polyurea should be an effective way to address this issue. Here, an innovative polyurea material, which exhibited excellent mechanical properties and self-healing abilities, was synthesized from the commercially available poly(propylene glycol) bis(2-aminopropyl ether), isophorone diisocyanate, and 2-Aminophenyl disulfide (APD). The rigid benzene ring in APD is beneficial to the mechanical properties of polyureas, simultaneously the irregular structure of APD prevents the hard segments from stacking tightly, which facilitates the exchange of disulfide bonds to achieve the self-healing function. Furthermore, the microstructure, mechanical properties and self-healing ability of the polyureas are highly dependent on the amount of APD. The obtained SPU-4 exhibits robust mechanical strength (tensile stress of 21.2 MPa), outstanding stretchability (strain of 1006%), high rigidity (Young's modulus of 248.1 MPa), and excellent energy absorption (toughness of 139.7 MJÁm À3 ), besides, with heat stimulation, the self-healing efficiencies based on strength and elongation could reach 92.7% and 74.5%, respectively. The excellent properties allow the material to show broad potential in the practical applications such as protection, energy absorption, etc.

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“…After stirring adequately, the white triethylamine hydrochloride was removed by filtration and the pale yellow filtrate was DMF solution of CDE. 20…”

Section: Synthesis Of Cdementioning

confidence: 99%

Effect of chain extender on microphase structure and performance of self‐healing polyurethane and poly(urethane‐urea)

Wang

et al. 2021

J of Applied Polymer Sci

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In this work, four aliphatic chain extenders, hexanediol (HDO), hexane diamine (HDA), cystamine (CY), and cystine dimethyl ester (CDE), were chosen to synthesize four kinds of polyurethane and poly(urethane-urea)s (PUs), respectively. HDO extended polyurethanes, HDA extended poly(urethane-urea), CY extended poly(urethane-urea), and CDE extended poly(urethane-urea) were denoted as OPU, APU, CPU, and SPU, respectively. The effect of chain extender type on microphase structure and performance of four PUs was investigated. Our research showed that mechanical strength increased in the following order: OPU < SPU < CPU < APU, and self-healing performance increased in the opposite direction. This result is attributed to the increasing degree of microphase separation: OPU < SPU < CPU < APU. The optimal sample SPU has not only excellent mechanical properties (tensile strength of 27.1 MPa and elongation at break of 397.7%), but also exhibits superior self-healing performance (self-healing efficiencies of 95.3% and 93.5% based on tensile strength and elongation at break). The moderate degree of microphase separation between the soft segments and the hard segments, the introduction of disulfide bonds and low degree of hydrogen bonding are responsible for preparing a polyurethane or poly(urethane-urea) system with high mechanical strength and excellent self-healing performance simultaneously. This work provides useful information for us to develop self-healing polyurethane or poly(urethane-urea) materials in the future.

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A Robust and High Self‐Healing Efficiency Poly(Urea‐Urethane) Based on Disulfide Bonds with Cost‐Effective Strategy

Cited by 11 publications

References 34 publications

Construction of Mechanical Robust Elastomers by Simulating the Strengthening and Healing Process of Natural Skin toward Multifunctional Electronics

Construction of Mechanical Robust Elastomers by Simulating the Strengthening and Healing Process of Natural Skin toward Multifunctional Electronics

A high‐performance self‐healing polyurea material based on exchangeable aromatic disulfide

Effect of chain extender on microphase structure and performance of self‐healing polyurethane and poly(urethane‐urea)

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