Wear and friction of epoxy based nanocomposites with silica nanoparticles and wax-containing microcapsules

Imani, Abolhassan; Zhang, Hui; Owais, Mohammad; Zhao, Jun; Chu, Pengfei; Yang, Jinglei; Zhong, Ziyi

doi:10.1016/j.compositesa.2018.01.033

Cited by 73 publications

(22 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Figure shows the COF of pure PA66 and the representative PA66 composites containing 0.5 wt% FG and 0.5 wt% GrF as a function of sliding distance. The COF of all the samples first experienced a rapid increase, which may be related to an increase in real contact area between the friction pairs . After the running‐in stage, the COF curve for pure PA66 and the PA66 composites became relatively stable, which is related to formation of the transfer film on the steel disc .…”

Section: Sliding Wear Behavior Of the Pa66 Compositesmentioning

confidence: 96%

Graphite fluoride and fluorographene as a new class of solid lubricant additives for high‐performance polyamide 66 composites with excellent mechanical and tribological properties

Sun

Fan

et al. 2020

Polymer International

View full text Add to dashboard Cite

Fluorographene (FG) with layer numbers of 3-4 was successfully prepared through facile microwave-assisted liquid phase exfoliation of raw graphite fluoride (GrF). The raw GrF and the as-prepared FG were then directly incorporated into polyamide 66 (PA66) by melt processing without using any surfactants. Microstructural, mechanical and tribological properties of the prepared PA66 composites were investigated. Various characterization results showed that both GrF and FG, as novel solid lubricants, can effectively improve the mechanical and anti-wear performances of the PA66 matrix. It was also found that FG is better at improving mechanical properties and reducing the friction of PA66 than GrF at low concentrations owing to the large surface-volume ratio. The addition of 0.5 wt% FG into PA66 exhibits a ca 13% increase in tensile modulus, ca 5% increase in tensile strength, ca 18% reduction in coefficient of friction (COF) and ca 43% reduction in wear rate. However, at relatively high concentrations, such as 1.0 wt%, GrF shows a better reinforcement effect than FG owing to a uniform dispersion of GrF in the PA66 matrix. The addition of 1.0 wt% GrF into PA66 exhibits a ca 18% increase in tensile modulus, ca 5% increase in tensile strength, ca 37% reduction in COF and ca 46% reduction in wear rate. Wear tests also show that the excellent wear resistance of the PA66 composites is due to the improved mechanical properties and the lubrication of GrF and FG between the worn surfaces. Our current work demonstrates the tremendous potentials of fluorinated carbon materials for enhancing mechanical and anti-wear properties of polymeric materials. -assisted liquid phase exfoliation; mechanical and tribological properties occurs when 20 wt% graphite is added into the PA6 matrix. Basavaraj et al. 19 also found that the PA66/graphite/PTFE composites show higher impact strength, higher thermal stability and better wear resistance than pure PA66. The PTFE plays the main role in improving the anti-wear properties of the PA66/graphite/PTFE composites, while the graphite plays the major role in enhancing the mechanical properties of the matrix, thereby compensating for the softening effect of PTFE on the PA66 matrix. However, traditional solid lubricants must be added in sufficient quantities to

show abstract

Section: Sliding Wear Behavior Of the Pa66 Compositesmentioning

confidence: 96%

Graphite fluoride and fluorographene as a new class of solid lubricant additives for high‐performance polyamide 66 composites with excellent mechanical and tribological properties

Sun

Fan

et al. 2020

Polymer International

View full text Add to dashboard Cite

show abstract

“…In general, there are two ways for core–shell particles to improve the tribological properties of the matrix: in the form of micro/nanocapsules and core–shell particles with solid cores. The commonly used method is micro/nanocapsules [ 55 , 56 , 57 , 58 , 59 , 60 , 61 ]. The core–shell particles with solid cores to improve the tribological properties of solid matrix are less reported at present relatively.…”

Section: Applicationsmentioning

confidence: 99%

“…1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM]PF 6 )@PU high-temperature-resistant microcapsules were prepared to greatly improve the fiction properties of epoxy resin (COF of 0.151, 72.7% lower than that of pure epoxy resin (EP)) [ 60 ]. Imani and his team [ 61 ] synthesized wax@SiO 2 nanoparticles and embedded them in the EP/SiO 2 matrix. The COF and wear rate of the composites were both reduced significantly due to the development of the thin and continuous transfer film on the steel ball and the good balance among basic mechanical properties.…”

Section: Applicationsmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of Core–Shell Micro/Nanoparticles and Their Tribological Application: A Review

Chen

Lin

et al. 2020

Materials

View full text Add to dashboard Cite

Owing to the diverse composition, adjustable performance, and synergistic effect among components, core–shell micro/nanoparticles have been widely applied in the field of tribology in recent years. The strong combination with the matrix and the good dispersion of reinforcing fillers in the composites could be achieved through the design of core–shell structural particles based on the reinforcing fillers. In addition, the performance of chemical mechanical polishing could be improved by optimizing the shell material coated on the abrasive surface. The physical and chemical state of the core–shell micro/nanoparticles played important effects on the friction and wear properties of materials. In this paper, the synthesis methods, the tribological applications (acted as solid/liquid lubricant additive, chemical mechanical polishing abrasives and basic units of lubricant matrix), and the functionary mechanisms of core–shell micro/nanoparticles were systematically reviewed, and the future development of core–shell micro/nanoparticles in tribology was also prospected.

show abstract

“…Capsule‐based self‐lubricating composites have attracted increasing attention and have been extensively investigated in recent years . As reported in previous research, to provide the self‐lubricating function, the lubricant must be wrapped in microcapsules before being incorporated into self‐lubricating polymer bulk materials or coating.…”

Section: Introductionmentioning

confidence: 99%

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

Cui

et al. 2019

Macro Materials & Eng

View full text Add to dashboard Cite

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...

show abstract

Wear and friction of epoxy based nanocomposites with silica nanoparticles and wax-containing microcapsules

Cited by 73 publications

References 35 publications

Graphite fluoride and fluorographene as a new class of solid lubricant additives for high‐performance polyamide 66 composites with excellent mechanical and tribological properties

Graphite fluoride and fluorographene as a new class of solid lubricant additives for high‐performance polyamide 66 composites with excellent mechanical and tribological properties

Synthesis of Core–Shell Micro/Nanoparticles and Their Tribological Application: A Review

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

Contact Info

Product

Resources

About

Wear and friction of epoxy based nanocomposites with silica nanoparticles and wax-containing microcapsules

Cited by 73 publications

References 35 publications

Graphite fluoride and fluorographene as a new class of solid lubricant additives for high‐performance polyamide 66 composites with excellent mechanical and tribological properties

Graphite fluoride and fluorographene as a new class of solid lubricant additives for high‐performance polyamide 66 composites with excellent mechanical and tribological properties

Synthesis of Core–Shell Micro/Nanoparticles and Their Tribological Application: A Review

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

Contact Info

Product

Resources

About

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