NIR-light-induced thermoset shape memory polyurethane composites with self-healing and recyclable functionalities

Du, Wei; Jin, Yong; Shi, Liangjie; Shen, Yichao; Lai, Shuangquan; Zhou, Yutang

doi:10.1016/j.compositesb.2020.108092

Cited by 80 publications

(32 citation statements)

References 51 publications

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“…It can be seen from the Figure 7 that the HE is improved after the introduction of GO, PU‐GO‐0.5 reaches a maximum of 98.54%, and PU‐GO‐0.1 decreases slightly to 86.37%, but both are higher than pure PU. The improvement of HE is attributed to the addition of GO, which will form more intermolecular hydrogen bonds, so the good HE can be obtained by the reversible oxime carbamate bonds and hydrogen bonds 50 . When the content of GO increases to 1.0 wt%, the reason for the decrease in HE is the introduction of a large amount of GO, which increases the crosslink density of the polymer and limits the mobility of the polymer chain.…”

Section: Resultsmentioning

confidence: 99%

Multi‐functional polyurethane composites with self‐healing and shape memory properties enhanced by graphene oxide

Luo

Guo

et al. 2021

J of Applied Polymer Sci

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Development of shape memory polymer materials with integrated self-healing ability, shape memory property, and outstanding mechanical properties is a challenge. Herein, isophorone diisocyanate, polytetramethylene ether glycol, dimethylglyoxime, and glycerol have been used to preparation polyurethane by reacting at 80 C for 6 h. Then, graphene oxide (GO) was added and the reaction keep at 80 C for 4 h to obtain polyurethane/GO composite with selfhealing and shape memory properties. Scanning electron microscopy shows that the GO sheets were dispersed uniformly in the polyurethane matrix. The thermal stability was characterized by thermogravimetric analyses. The tensile test shows that the Young's modulus of the composites increases from 38.57 ± 4.35 MPa for pure polyurethane to 95.36 ± 10.35 MPa for the polyurethane composite with a GO content of 0.5 wt%, and the tensile strength increases from 6.28 ± 0.67 to 15.65 ± 1.54 MPa. The oxime carbamate bond and hydrogen bond endow the composite good self-healing property. The healing efficiency can reach 98.84%. In addition, the composite has excellent shape memory property, with a shape recovery ratio of 88.6% and a shape fixation ratio of 55.2%. This work provides a promising way to fabricate stimulusresponsive composite with versatile functions.

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Section: Resultsmentioning

confidence: 99%

Multi‐functional polyurethane composites with self‐healing and shape memory properties enhanced by graphene oxide

Luo

Guo

et al. 2021

J of Applied Polymer Sci

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“…[ 51 ] Figure 3b depicts that the prepared DAPU samples presented two main regions at around −13 and 110 °C, which can be ascribed to the T g and retro Diels‐Alder reaction ( T rDA ), respectively. [ 51,52 ]…”

Section: Resultsmentioning

confidence: 99%

NIR Light Stimulated Self‐Healing Reduced Tungsten Oxide/Polyurethane Nanocomposite Based on the Diels−Alder Reaction

Motora

Chang

et al. 2021

Macro Materials & Eng

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Cracks formed in materials can influence the performances and shorten their lifetime. Self‐healing materials can repair cracks caused by mechanical damage using external stimuli, which increases their safety, extend their service life, and can save renovation costs. In this work, a novel thermo‐responsive linear Diels‐Alder polyurethane (DAPU) and reduced tungsten oxide (WO3−x) (W‐DAPU) is developed for the first time. Its near‐infrared (NIR) light‐induced self‐healing properties are evaluated using qualitative optical observation and quantitative tensile measurements. The NIR light‐induced self‐healing and photothermal conversion property of W‐DAPU is also systematically investigated. The results show that linear DAPU has an excellent thermo‐reversible self‐healing efficiency of 94.8% and heals within 6 s due to the presence of a DA bond. In addition, the W‐DAPU has a self‐healing efficiency of 83.2% with outstanding photothermal conversion. This study paves the way to design and fabricate stimuli‐responsive nanocomposite materials for various applications.

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“…Since the photo-activation resulted in a higher thermal energy, transesteri cations in the vitrimer network were initiated to dissociate the crosslinked network. This phenomenon allows the polymer chain diffusion to ll the scratch, resulting in self-healing (40). Without CNTs, the V-CNT0 showed self-healing because of the -interactions between polymer chains (41), but the self-healing ability was only 31%.…”

Section: Nir Self-healing Ability Of Vitrimer Nanocompositesmentioning

confidence: 99%

Self-healing Ability of Epoxy Vitrimer Nanocomposites Containing Bio-Based Curing Agents and Carbon Nanotubes for Corrosion Protection

et al. 2021

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Epoxy is extensively used for anti-corrosion coatings on metallic materials. Conventional epoxy coatings have a permanent crosslink network that is unable to repair itself when cracks and damages occur on the coating layer. This study aims to develop self-healing epoxy vitrimer/carbon nanotube (CNTs) nanocomposite for coating. Two bio-based curing agents viz., cashew nut shell liquid (CNSL) and citric acid (CA) were employed to create covalent adaptable networks. The 0-0.5 wt% CNTs were also incorporated into epoxy/CNSL/CA matrix (V-CNT0-0.5). Based on the results of our study, thermomechanical properties of V-CNT nanocomposites increased with increasing CNTs content. The bond exchange reaction of esteri cation was thermally activated by near infrared (NIR) light. The V-CNT0.5 showed the highest self-healing e ciency in Shore D hardness of 97.37%. The corrosion resistance of coated steel with V-CNT0 and V-CNT0.5 were observed after immersing the samples in 3.5 wt% NaCl for 7 days. The corrosion rate of coated steel with V-CNT0.5 decreased from 9.53 x 10 2 MPY to 3.12 x 10 -5 MPY whereas an increase in protection e ciency of 99.99% was observed. By taking advantages of the superior self-healing and anti-corrosion properties, V-CNT0.5 could prove to be a desirable organic anti-corrosion coating material.

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NIR-light-induced thermoset shape memory polyurethane composites with self-healing and recyclable functionalities

Cited by 80 publications

References 51 publications

Multi‐functional polyurethane composites with self‐healing and shape memory properties enhanced by graphene oxide

Multi‐functional polyurethane composites with self‐healing and shape memory properties enhanced by graphene oxide

NIR Light Stimulated Self‐Healing Reduced Tungsten Oxide/Polyurethane Nanocomposite Based on the Diels−Alder Reaction

Self-healing Ability of Epoxy Vitrimer Nanocomposites Containing Bio-Based Curing Agents and Carbon Nanotubes for Corrosion Protection

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