Aromatic disulfide-induced self-reinforcing polyurethane elastomer with self-healability

Luo, Yanlong; Chen, Jialiang; Situ, Gaohua; Li, Chichao; Zhang, Chenrui; Li, Fanzhu; Li, Chenghui; Luo, Zhenyang; Zhang, Xi

doi:10.1016/j.cej.2023.143958

Cited by 23 publications

(14 citation statements)

References 39 publications

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“…4,22 Moreover, the phase diagram of atomic force microscopy (AFM) also confirmed that the PU possessed a microphaseseparated structure (Figure S3). 10,48,49 Interestingly, the glass transition temperatures in the soft segment phase (T gd s ) of the PU 3:1 , PU 0.5%BADS , PU 1%BADS and PU 2%BADS elastomers showed a decreased trend followed by an increasing trend of −66.85, −68.69, −68.94, and −67.42 °C, respectively. This was probably because the introduction of BADS acted as a chain extender to prolong the molecular chain and a rigid structure to restrict the movement of the molecular chain.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Mechanically Ductile, Self-Healable, Low-Temperature, and Water-Tolerant Polyurethane for High-Performance Strain Sensor

Wu,

Ma,

Zhang

et al. 2023

ACS Appl. Polym. Mater.

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The water degradation of polyurethane (PU) elastomers can seriously influence the quality of related equipment and instruments and may even entail serious economic and safety problems as well as environmental hazards. Therefore, the development of PU with water tolerance to ensure its safety and functional stability is of great importance for practical applications.Here, the hydrophobic functional component α-cyclodextrin (α-CD) has been further introduced into the current hydroxylterminated polybutadiene (HTPB)-based water-resistant PU molecular chains. Benefiting from the hydrophobic inner cavity in the α-CD structure, on the one hand, the water resistance of PU elastomers was significantly improved, while on the other hand, the mechanical properties of the PU molecular chains were enhanced thanks to the covalent cross-linked network in the structure. The PU elastomer exhibited a high tensile strain of 1307%, fracture energy of 52,800 J m −2 , puncture energy of 374 mJ, and self-healing efficiency of 98% when heated for 2 h. Remarkably, the asprepared PU elastomer, strain sensor, and conductive inks still exhibited excellent mechanical properties, stability, sensing performance, and conductivity even in harsh underwater and low-temperature environments. Moreover, the strain sensor possessed excellent recyclability and reprocessability, which further extended the practical applications of the strain sensor in harsh environments.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Mechanically Ductile, Self-Healable, Low-Temperature, and Water-Tolerant Polyurethane for High-Performance Strain Sensor

Wu,

Ma,

Zhang

et al. 2023

ACS Appl. Polym. Mater.

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“…The results revealed that the addition of modified nano-SiO 2 particles dramatically increased the intermolecular interaction forces and boosted the average intermolecular chain crosslinking density, contributing to stronger internal molecular structural stability. 23,28 No fracture occurred in the process of loading-unloading cycles under large strain, indicating that it possessed superior mechanical stability. Moreover, we conducted 100 cycles of stretching (Figure S8) for the PPU/SiO 2 -0.2 system at relatively minor strain (60%), further demonstrating that the PPU/SiO 2 -0.2 elastomer can be reliably repeated in the stretched state.…”

Section: Mechanical Properties Of Ppu/sio 2 Elastomersmentioning

confidence: 99%

“…In Figure 3I, the stress-cycle time curve also verified the breakage of the sacrificial bonds (hydrogen bond breaking) and the process of attaining dynamic equilibrium, which is plotted schematically in Figure S9. 28,29 Tear resistance is one of the most valuable mechanical properties of elastomers. Adequate tear resistance enables elastomers to withstand large loading without being damaged, which is vital for the safety in use.…”

Section: Mechanical Properties Of Ppu/sio 2 Elastomersmentioning

confidence: 99%

“…6,24 The fracture and recombination of sacrificial bonds effectively promote the energy dissipation efficiency of steady-state propagation as well as resist the crack propagation. 28,32 Furthermore, the trouser tearing test was carried out, and the results revealed that the tearing force was 14 N, while the tearing energy could reach 67.7 kJ m À2 (Figure 4D). 24 These experiments indicate that PPU elastomer boasts outstanding mechanical robustness and tear resistance, and can effectively withstand crack growth.…”

Section: Mechanical Properties Of Ppu/sio 2 Elastomersmentioning

confidence: 99%

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Vat photopolymerization printing of strong tear‐resistance and stretchable polyurethane elastomer for highly sensitive strain sensors

Fei,

Rong,

et al. 2023

Polymer Composites

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Herein, a polyurethane elastomer reinforced with SiO2 nanoparticles modified with 3‐(trimethoxysilyl) methacrylate was proposed, enabling outstanding tensile, tear resistance and suitability for a variety of complex applications. The introduction of modified SiO2 nanoparticles has augmented the crosslink density among the molecular chains. The prioritized fracture of sacrificial bonds and chain entanglement can extend the local damage at the crack tip to the whole elastomer network. This effect might significantly improve the efficiency of energy dissipation, as well as prevent the crack propagation. The polyurethane elastomer, which consists of 0.5% modified nano‐SiO2, demonstrated a tear strength of 23.4 N/mm and superior mechanical stability, surpassing most commercial photocurable 3D printed polyurethane elastomers available commercially. Subsequently, polyurethane composite nano‐SiO2/LiTFSI (PSL) strain sensors with various flexible architectures were fabricated using DLP 3D printing technology by incorporating LiTFSI ionic liquid. The PSL strain sensor exhibited long‐term operational stability and high sensitivity, showing a considerable potential in the field of electronics. Overall, this study has opened up new opportunities for 3D printing of smart structured wearable devices with high performance.Highlights We constructed a SiO2 nanoparticle which can be used as a crosslinking agent of polyurethane molecular chain. The polyurethane elastomer doped with SiO2 nanoparticles is endowed with an excellent tear resistance. The LiTFSI composite PPU strain sensor constructed by DLP exhibited long‐term operational stability and high sensitivity.

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“…By adjusting the hard and soft segments, polyurethanes have flexible and versatile structure [ 31–33 ] to meet their needs in different fields. [ 34,35 ] In previous studied, researchers have favored to find special raw materials to prepare large‐molecular‐weight polyurethanes with robust mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

3D Printing of Branched Polyurethane with Tough Mechanical Properties for Stretchable Sensors

Shuai,

Zhang,

Yao

et al. 2023

Adv Eng Mater

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The poor mechanical properties and difficulties in manufacturing complex structures seriously limit the applications of elastomers especially in flexible electronic sensor. Herein, a series of polyether amine (PEA) grafted polyurethane acrylate oligomers (PUA‐g‐PEAs) and the corresponding low‐viscosity UV‐curable flexible 3D printing elastomers (PEA‐1/IDAs) were synthesized. The results showed that a certain amount of PEA branch exactly had strengthening and toughening effect on polyurethane, resulting in 12% increase in tensile strength and 44% increase in elongation at break of PUA‐g‐PEA‐1. When mixed PUA‐g‐PEA‐1with ACMO and IDA in the ratio of 3:5:2, PEA‐1/IDA‐20 with best overall mechanical properties was obtained. Its tensile strength and elongation at break were 18.5 MPa and 297.4%, respectively. The unprecedented fatigue resistance of PEA‐1/IDA‐20 ensured that it can withstand 100 compression cycles at 80% strain without damage. Besides, piezoresistive sensors and wearable finger guard sensors were fabricated by laminating a layer of conductive hydrogel on the surface of the 3D‐printed devices. The impressive mechanical properties and 3D printing producing process of this branched PUA endow it with great potentials in advanced electronic sensors.This article is protected by copyright. All rights reserved.

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Aromatic disulfide-induced self-reinforcing polyurethane elastomer with self-healability

Cited by 23 publications

References 39 publications

Mechanically Ductile, Self-Healable, Low-Temperature, and Water-Tolerant Polyurethane for High-Performance Strain Sensor

Mechanically Ductile, Self-Healable, Low-Temperature, and Water-Tolerant Polyurethane for High-Performance Strain Sensor

Vat photopolymerization printing of strong tear‐resistance and stretchable polyurethane elastomer for highly sensitive strain sensors

3D Printing of Branched Polyurethane with Tough Mechanical Properties for Stretchable Sensors

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