Synthesis and optimization of polyurethane microcapsules containing [BMIm]PF6 ionic liquid lubricant

Ma, Yingjie; Li, Zhike; Wang, Huaiyuan; Li, Haiyan

doi:10.1016/j.jcis.2018.09.059

Cited by 90 publications

(43 citation statements)

References 38 publications

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“…and have a rough outer surface resulting from the deposition of PUF particles. The morphology of prepared multilayer microcapsules was quite different from PU microcapsules with smooth outer surface prepared in our previous work (as shown in Figure b). The outer surface was very rough because of the deposition of PUF particles.…”

Section: Resultscontrasting

confidence: 61%

“…The tribological properties are superior to that of reported composites incorporating microcapsules containing wax, lubricant oil, and IPDI, indicating [BMIm]PF 6 has a better lubrication effect. Furthermore, compared with our previous study, the multilayer shell structure of the microcapsules also plays an active role in improving the tribological properties, which attribute to the improved interface strength between the microcapsules and resin matrix brought about by the rough outer surface of microcapsules compared with smooth PU shell microcapsules. The results show that [BMIm]PF 6 ‐loaded multilayer microcapsules with high core content can indeed result in excellent self‐lubricating properties of the composites.…”

Section: Resultsmentioning

confidence: 63%

“…Simultaneously, much of the polymer debris formed on the worn surface and no transfer film was formed during the friction process, as shown in Figure a, which resulted in the larger frictional coefficient and specific wear rate. However, the worn surface of composites containing 20 wt% PU microcapsules (prepared by a previous method) and PU/Lignin/PUF multilayer shell microcapsules are smoother than that of pure epoxy, which could be attributed to the formation of a firm transfer film on the worn surface because of the release of bipolar [BMIm]PF 6 ionic liquid from microcapsules. The red and blue circles drawn in the SEM images mark these ruptured microcapsules filled with wear debris.…”

Section: Resultsmentioning

confidence: 98%

“…Figure illustrates the synthetic process multilayer microcapsules. [BMIm]PF 6 was stabilized by lignin Pickering emulsion, and then [BMIm]PF 6 ‐loaded PU/lignin microcapsules were prepared adopting the established optimal synthesis method in our previous work . PU/Lignin/PUF multilayer microcapsules were then synthesized by in situ polymerization.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, we have prepared ionic liquid [BMIm]PF 6 ‐loaded polyurea (PU) microcapsules with >70 wt% encapsulation efficiency by optimizing a Pickering emulsion and interface polymerization method. The Pickering emulsion was stabilized by lignin solid particles instead of molecular surfactants and some inorganic particles, and we found that the lignin exhibited excellent emulsifying properties for ionic liquid . However, the smooth outer surface of PU microcapsules prevents them from forming a good interface with the resin matrix when they are used to prepared composites.…”

Section: Introductionmentioning

confidence: 94%

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Ultralow Tribological Properties of Polymer Composites Containing [BMIm]PF₆‐Loaded Multilayer Wall Microcapsule

Cui

et al. 2019

Macro Materials & Eng

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polymer bulk materials or coating. Upon damaging the self-lubricating materials by friction, the embedded microcapsules simultaneously rupture, release the lubricant, form the transfer film, and then lubricate the wear surface. Therefore, selflubricating microcapsules must possess several features, such as excellent thermal stability, high encapsulation efficiency, and good lubricating properties.Various lubricants have been microencapsulated, including lubricant oil, [4][5][6][7] paraffin, wax, [8][9][10][11] diisocyanate, [12,13] and ionic liquid. [14][15][16] In addition to reducing friction and wear, lubricating oils are required to cool the rubbing surfaces that are heated due to friction. Thermooxidative stability of lubricants is essential to minimize degradation during service and storage. Lubricating oils may vaporize and sometimes may catch fire due to friction heat. Therefore, less volatile and nonflammable liquids are desirable for lubricants. [17] Compared with some common lubricants, ionic liquids have high thermal stabilities (the thermal degradation temperature is usually higher than 350 °C) and low volatility and non-flammability. These excellent properties make them more suitable as high-performance lubricants. [18][19][20][21] Nevertheless, when the wrapped core material is an ionic liquid, the encapsulation efficiency is lower because the high viscosity and bipolar nature of the ionic liquid make them difficult to disperse in a continuous phase during microencapsulation. [22][23][24][25] Recently, we have prepared ionic liquid [BMIm] PF 6 -loaded polyurea (PU) microcapsules with >70 wt% encapsulation efficiency by optimizing a Pickering emulsion and interface polymerization method. The Pickering emulsion was stabilized by lignin solid particles instead of molecular surfactants and some inorganic particles, and we found that the lignin exhibited excellent emulsifying properties for ionic liquid. [26] However, the smooth outer surface of PU microcapsules prevents them from forming a good interface with the resin matrix when they are used to prepared composites. In order to improve the thermal stability, mechanical properties, long-term stability at room temperature of microcapsules, and then to make these microcapsules were satisfy the requirements of the processing of polymeric composites under high temperatures and large shear stress conditions, Self-Lubricating CompositesMultilayer wall microcapsules efficiently loaded with a lubricant (ionic liquid [BMIm]PF 6 ) are successfully synthesized via a combination of interfacial and in situ polymerization reactions based on lignin nanoparticle-stabilized Pickering emulsion templates. The resulting microcapsules are spherical in shape, with an ideal structure of a rough outer surface and a smooth inner surface. The mean diameter and wall thickness of the resultant microcapsules are 52 ± 18 µm and 3-6 µm. The core fraction is ≈71.29 wt%. Compared with the pure epoxy resin, the friction coefficient of self-lubricating composites decreases by 83.6% (fr...

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Section: Resultscontrasting

confidence: 61%

Section: Resultsmentioning

confidence: 63%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

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Ultralow Tribological Properties of Polymer Composites Containing [BMIm]PF₆‐Loaded Multilayer Wall Microcapsule

Cui

et al. 2019

Macro Materials & Eng

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Ionic Liquid‐Filled Polyamide Microcapsules Obtained by Interfacial Polymerization

Scholl,

Freudenmann

2024

Adv Materials Inter

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Microencapsulated ionic liquids (ILs) have a wide range of exciting properties. They can be synthesized by a variety of methods, of which interfacial polymerization represents a very simple, fast, and reliable production process, but the number of available shell materials that can be obtained by this method is limited. However, recent advances in the field of interfacial polymerization have described the formation of a polyamide membrane at the IL/organic phase interface, which is extended in this work to the first microencapsulation of ILs with a polyamide shell, providing an additional and versatile shell material. The IL‐filled microcapsules are obtained using a surfactant‐free synthesis process and inexpensive, low‐toxicity monomers and solvents and feature an exceptionally high core‐to‐shell weight ratio enabling a broad range of possible applications.

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Chemical Vapor Deposition of Ionic Liquids for the Fabrication of Ionogel Films and Patterns

et al. 2021

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Film deposition and high‐resolution patterning of ionic liquids (ILs) remain a challenge, despite a broad range of applications that would benefit from this type of processing. Here, we demonstrate for the first time the chemical vapor deposition (CVD) of ILs. The IL‐CVD method is based on the formation of a non‐volatile IL through the reaction of two vaporized precursors. Ionogel micropatterns can be easily obtained via the combination of IL‐CVD and standard photolithography, and the resulting microdrop arrays can be used as microreactors. The IL‐CVD approach will facilitate leveraging the properties of ILs in a range of applications and microfabricated devices.

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Synthesis and optimization of polyurethane microcapsules containing [BMIm]PF6 ionic liquid lubricant

Cited by 90 publications

References 38 publications

Ultralow Tribological Properties of Polymer Composites Containing [BMIm]PF₆‐Loaded Multilayer Wall Microcapsule

Ultralow Tribological Properties of Polymer Composites Containing [BMIm]PF₆‐Loaded Multilayer Wall Microcapsule

Ionic Liquid‐Filled Polyamide Microcapsules Obtained by Interfacial Polymerization

Chemical Vapor Deposition of Ionic Liquids for the Fabrication of Ionogel Films and Patterns

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Synthesis and optimization of polyurethane microcapsules containing [BMIm]PF6 ionic liquid lubricant

Cited by 90 publications

References 38 publications

Ultralow Tribological Properties of Polymer Composites Containing [BMIm]PF6‐Loaded Multilayer Wall Microcapsule

Ultralow Tribological Properties of Polymer Composites Containing [BMIm]PF6‐Loaded Multilayer Wall Microcapsule

Ionic Liquid‐Filled Polyamide Microcapsules Obtained by Interfacial Polymerization

Chemical Vapor Deposition of Ionic Liquids for the Fabrication of Ionogel Films and Patterns

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Ultralow Tribological Properties of Polymer Composites Containing [BMIm]PF₆‐Loaded Multilayer Wall Microcapsule

Ultralow Tribological Properties of Polymer Composites Containing [BMIm]PF₆‐Loaded Multilayer Wall Microcapsule