Highly stretchable, high efficiency room temperature self-healing polyurethane adhesive based on hydrogen bonds – applicable to solid rocket propellants

Tu, Jing; Xu, Huifang; Xiang, Guifeng; Ling, Chen; Li, Pingyun; Guo, Xiaode

doi:10.1039/d1py00439e

Cited by 41 publications

(14 citation statements)

References 57 publications

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“…So, the maximum healing efficiency can be attained via increasing the self-healing time. 45 To realize the self-healing performance from rheology, the stress−relaxation experiment was conducted on the WPU films at rt and 90 °C, provided at a fixed strain of 10% for 15 min. Additionally, to explore the key role of DMF in the healing mechanism, 0.2 μL of DMF was spread on the film (WPU-HI-2) for 10 s prior to the test under the same condition.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Asymmetric Hard Domain-Induced Robust Resilient Biocompatible Self-Healable Waterborne Polyurethane for Biomedical Applications

Morang

Bandyopadhyay

Mandal

et al. 2023

ACS Appl. Bio Mater.

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The synthesis of eco-friendly and biocompatible waterborne polyurethanes (WPUs) through judicious molecular engineering with supreme mechanical strength, good shape recoverability, and high self-healing efficiency is still a formidable challenge because of some mutually exclusive conflicts among these properties. Herein, we report a facile method to develop a transparent (80.57–91.48%), self-healable (efficiency 67–76%) WPU elastomer (strain 3297–6356%) with the highest reported mechanical toughness (436.1 MJ m–3), ultrahigh fracture energy (126.54 kJ m–2), and good shape recovery (95% within 40 s at 70 °C in water). These results were accomplished by introducing high-density hindered urea-based hydrogen bonds, an asymmetric alicyclic architecture (isophorone diisocyanate–isophorone diamine), and the glycerol ester of citric acid (a bio-based internal emulsifier) into the hard domains of the WPU. Most importantly, platelet adhesion activity, lactate dehydrogenase activity, and erythrocyte or red blood corpuscle lysis demonstrated the hemocompatibility of the developed elastomer. Simultaneously, the cellular viability (live/dead) assay and the cell proliferation (Alamar blue) assay of human dermal fibroblasts corroborated the biocompatibility under in vitro conditions. Furthermore, the synthesized WPUs showed melt re-processability with retention of mechanical strength (86.94%) and microbe-assisted biodegradation. The overall results, therefore, indicate that the developed WPU elastomer might be used as a potential smart biomaterial and coating for biomedical devices.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Asymmetric Hard Domain-Induced Robust Resilient Biocompatible Self-Healable Waterborne Polyurethane for Biomedical Applications

Morang

Bandyopadhyay

Mandal

et al. 2023

ACS Appl. Bio Mater.

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“…The phase diagrams of PUU-1 to PUU-5 samples taken by the AFM are shown in Figure b. The bright and dark areas correspond to the difference in material elasticity . The bright area is the hard segment, and the dark area is the soft segment.…”

Section: Results and Discussionmentioning

confidence: 99%

“…The bright and dark areas correspond to the difference in material elasticity. 47 The bright area is the hard segment, and the dark area is the soft segment. The hard dominations are randomly distributed in the soft dominations, and the distribution of bright areas increases significantly as the content of the hard segments increases.…”

Section: Resultsmentioning

confidence: 99%

Novel Molecular-Level Insight into the Self-Healing Behavior and Mechanism of Polyurethane-Urea Elastomer Based on a Noncovalent Strategy

Chen

Jia

et al. 2022

Macromolecules

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A larger number of studies successfully prepared various polymer materials with excellent self-healing properties, but the study on the underlying self-healing mechanism remains comparably backward and still unclear. In this study, we prepared a self-healing polyurethane-urea (PUU) elastomer based on noncovalent bonds. Then, a coarse-grained model of PUU was successfully constructed using the iteration Boltzmann inversion (IBI) method. Microphase separation and mechanical properties of PUU were reproduced using this model by coarse-grained molecular dynamics (MD) simulation. The three-stage healing mechanism comprised the following: (1) movement of the material to close the gap, (2) interdiffusion of the polymer, and (3) bond exchange. The mechanism was revealed by determining the effects of hard segment content on the microstructure (chain entanglement, interactions of soft and hard segments, chain motility) and healing capacity over healing time. In the initial stage of healing, the polymer chains were disentangled, and the degree of entanglement of the healed samples decreased. A novel experimental strategy confirmed the transition of hydrogen bonds from disorder to order during the healing process. The motility of the cut polymer chains (low molecular weight), especially the cut soft segment, and the disordered hydrogen bonds played a key role in the healing capacity. The increased content of the ordered hydrogen bonds led to the formation of a hard segment network, which was not conducive to healing. Finally, the promoting mechanism of external factors, such as heating and trace amount of solvent, on the healing of PUU was explained. Our work systematically and profoundly reveals the self-healing behavior and mechanism of microphase-separated PUU at the molecular level.

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“…The decomposition peak at about 420 1C represented the breaking of the soft polyurethane segment. 50,51 According to the details of Fig. 3a, PU-A was the first to undergo thermal decomposition compared with the other samples.…”

Section: Thermal and Mechanical Propertiesmentioning

confidence: 99%

Rapid self-healing and tough polyurethane based on the synergy of multi-level hydrogen and disulfide bonds for healing propellant microcracks

Xiang

et al. 2022

Mater. Chem. Front.

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Highly stretchable, high efficiency room temperature self-healing polyurethane adhesive based on hydrogen bonds – applicable to solid rocket propellants

Abstract: Formation and expansion of cracks in propellant would induce debonding at interface between different constituents, and may even cause explosion of the propellant during launch. One way to prohibit the...

Cited by 41 publications

References 57 publications

Asymmetric Hard Domain-Induced Robust Resilient Biocompatible Self-Healable Waterborne Polyurethane for Biomedical Applications

Asymmetric Hard Domain-Induced Robust Resilient Biocompatible Self-Healable Waterborne Polyurethane for Biomedical Applications

Novel Molecular-Level Insight into the Self-Healing Behavior and Mechanism of Polyurethane-Urea Elastomer Based on a Noncovalent Strategy

Rapid self-healing and tough polyurethane based on the synergy of multi-level hydrogen and disulfide bonds for healing propellant microcracks

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