Effects of rare earth oxide additive on surface and tribological properties of polyimide composites

Pan, Zihe; Wang, Tianchang; Chen, Li; Idziak, Stefan H. J.; Huang, Zhaohui; Zhao, Boxin

doi:10.1016/j.apsusc.2017.04.172

Cited by 34 publications

(12 citation statements)

References 64 publications

(94 reference statements)

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“…In the modeling of PI1 molecules, 3,3′,4,4′‐diphenyl ether tetracarboxylic anhydride (ODPA) and diaminodiphenyl ether (ODA) were applied to build molecular chains. PI with this configuration had a mature application in the ultrasonic motor designed and manufactured by our group 22–26 . According to the design method of Ma et al, 10–12 the molecular structure of PI1 was changed into PI2 to improve the rigidity and heat resistance.…”

Section: Methodsmentioning

confidence: 99%

Improving the high temperature tribology of polyimide by molecular structure design and grafting POSS

Yin

Song

Zhao

et al. 2021

Polymers for Advanced Techs

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In this paper, the method of enhancing glass transition temperature of polyimide (PI) composite for ultrasonic motor was employed from the three aspects by molecular dynamics simulation. First, polyimide with different molecular stiffness was designed and their mechanical and thermal properties were calculated after optimization. The simulated results showed that polyimide with stronger stiffness had higher glass transition temperature (Tg), higher Young's modulus and shear modulus. Besides, PI composite was designed by filling different proportional polyhedral oligomeric silsesquioxane (POSS) to improve the thermostability continuously. Simulated results showed that the glass transition temperature of PI composites increased with an increase of POSS content. The third method was filling grafted POSS (POSS‐PI) with PI molecular into PI matrix to improve the compatibility. It was found that the thermal properties were slightly improved compared with PI filled with single POSS. PI composite with 9% POSS‐PI2 had the highest glass transition temperature. More importantly, the friction coefficient and the temperature rise on the friction interface were calculated and the result showed that the friction coefficient decreased with the increase of environment temperature. Finally, the improvement mechanism of grafted POSS was analyzed by extracting the energy of intermolecular interaction, mean square displacement, atomic relative concentration and velocity.

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Section: Methodsmentioning

confidence: 99%

Improving the high temperature tribology of polyimide by molecular structure design and grafting POSS

Yin

Song

Zhao

et al. 2021

Polymers for Advanced Techs

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show abstract

“…[6,7] Hence, tremendous research efforts have been carried out to improve the tribological performance of PIs. Multifarious reinforcement materials, including graphene oxide, [8,9] carbon fabric, [10] MoS 2 , [11] polytetrafluoroethylene (PTFE), [12] bamboo fibers, [13] aramid particles, [14] graphite, [15] SiO 2 nanospheres, [16,17] La 2 O 3 , [18] and foamed Cu [19] have been introduced into a PI matrix via a myriad of preparation methods to enhance their mechanical, thermal, and tribological properties.…”

Section: Introductionmentioning

confidence: 99%

Surface wettability, tensile mechanical performance, and tribological behavior of polyimide/polytetrafluoroethylene blends enhanced with hydroxylated multiwalled carbon nanotubes at high relative humidity

Yan

Xue

2021

Polymer Composites

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Multiwalled carbon nanotubes were hydroxylated (MWCNTs-OH) by a strong acid mixture and then used as a reinforcement nanofiller in blends of polytetrafluoroethylene (PTFE) and polyimide (PI) to fabricate MWCNTs-OH/ PTFE/PI nanocomposites. The influences of MWCNTs-OH additions on the surface wettability, tensile mechanical property, and tribological behaviors of MWCNTs-OH/PTFE/PI nanocomposites under different relative humidity were investigated. Test results indicate that the introduction of MWCNTs-OHcan dramatically decrease the static water contact angles and increase the tensile strengths and elastic moduli of the PTFE/PI polymer blends. This is largely due to the existence of numerous hydrophilic functional groups on the surfaces of MWCNTs-OH and its ultrahigh mechanical characteristics. The relative humidity has a much weaker impact on the friction coefficients of the MWCNTs-OH/PTFE/PI nanocomposites than on the wear rates. Of all composites, the 0.8 wt% MWCNTs-OH/PTFE/PI nanocomposite possesses the lowest friction coefficient (0.11) and wear rate (2.97 Â 10 À15 m 3 /(Nm)) at a high relative humidity of 90%. The conspicuous increase in wear resistance is attributable to the enhancement effect of MWCNTs-OH and the generation of homogeneous polymer self-lubricating tribofilms.

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“…high-performance polymers and their composites are suitable for the applications of long-term service at high temperature and in extreme tribological working environments with rapid temperature changes. 9,10 For the sake of further strengthening the antifriction and wear-resistant properties of these polymers, all types of reinforcement materials (carbon fibers 11 ) and solid lubricants (MoS 2 , 12 graphene oxide, 13 rare earth oxides, 14 etc.) were applied in the preparation process of polymer-matrix composites.…”

mentioning

confidence: 99%

Thermomechanical and tribological properties of polyimide and polyethersulfone blends reinforced with expanded graphite particles at various elevated temperatures

Xue

Yan

Chen

2022

J of Applied Polymer Sci

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Expanded graphite (EG) particles were introduced into the polyimide (PI) and polyethersulfone (PES) blend to enhance the dynamic thermomechanical and tribological performances of this polymer composite at evaluated temperatures ranging from room temperature to 250°C. The influences of EG dosage, evaluated temperature and vertical loads on the high‐temperature tribological behaviors, worn surface morphologies and wear mechanisms of EG/PES/PI composites were analyzed. Experimental results suggest that tensile strength, dynamic storage modulus, glass transition temperature as well as thermal stability of EG/PES/PI composites are superior to those of the PES/PI blend and they are raised as the EG additions increase. Whether at room temperature or at the high temperature of 250°C, the EG/PES/PI composites display the better friction‐reducing and abrasion resistant performances than the PES/PI blend. Among all these composites, the 7.0 wt% EG/PES/PI composite demonstrates the best friction and wear properties (0.23, 5.68 × 10−16 m3/[N·m]) at evaluated temperatures. The noticeable improvement in abrasive property of EG/PES/PI composites at high‐evaluated temperatures stems from extraordinary porous microstructures and outstanding lubrication characteristics of EG particles as well as the formation of uniform self‐lubricating polymer tribofilms. This composite as antifriction and wear‐resistant materials possesses potential applications in high‐temperature engineering tribology, such as rolling bearing retainer, and so forth.

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Effects of rare earth oxide additive on surface and tribological properties of polyimide composites

Cited by 34 publications

References 64 publications

Improving the high temperature tribology of polyimide by molecular structure design and grafting POSS

Improving the high temperature tribology of polyimide by molecular structure design and grafting POSS

Surface wettability, tensile mechanical performance, and tribological behavior of polyimide/polytetrafluoroethylene blends enhanced with hydroxylated multiwalled carbon nanotubes at high relative humidity

Thermomechanical and tribological properties of polyimide and polyethersulfone blends reinforced with expanded graphite particles at various elevated temperatures

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