Preparation and oil lubrication of polyvinylidene fluoride (PVDF) nanospheres

Dong, Guangneng; Hafezi, Mahshid; Tong, Zhe; Qin, Liguo

doi:10.1088/2053-1591/ab220e

Cited by 7 publications

(11 citation statements)

References 40 publications

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“…Nevertheless, PVDF has the problems of high friction coe cient and poor self-lubricating properties. Therefore, it is worthy of attention to select suitable lubricating llers, improve the tribological properties of PVDF, and thus boost its tribological application [22][23][24]. In recent years, there have been some efforts to overcome the limitations of PVDF.…”

Section: Introductionmentioning

confidence: 99%

Influence of PAO@PSF microcapsules on the tribological properties of polyvinylidene fluoride matrix recovered from waste membranes

Liang

et al. 2023

Preprint

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In the study, the waste polyvinylidene fluoride (PVDF) membranes were recovered and the micropowders of this polymer were obtained by solvent recovery method. Moreover, the new direction for applying waste PVDF membranes to the field of tribology were developed. Thus, a novel PVDF-based tribological composite (PAO@PSF/PVDF) was fabricated with recycled PVDF micropowders acted as the matrix polymer and PAO@PSF microcapsules with the configuration of polysulfone (PSF) capsuling lubricant oil (PAO) served as the filler. The self-lubricating and wear properties of PAO@PSF/PVDF composite were tested under dry sliding condition using a ball-on-disc configuration. In particular, this kind of composite with the inclusion of 20 wt% PAO@PSF microcapsules exhibited the best tribological properties, i.e., the lowest friction coefficient (0.077) and the smallest wear rate (2.34×10-15 m3/Nm). The filling of PAO@PSF microcapsules greatly improved the antifriction and wear resistance of PVDF, guaranteeing the self-lubricating feature of this polymer. The tribological properties of PAO@PSF/PVDF composite can reach close to those under the condition of dripping lubricating oil, and the prepared PAO@PSF/PVDF self-lubricating composite can be applied to a large range of friction conditions. Furthermore, without any doubt, it will facilitate the reutilization of waste polymers.

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Section: Introductionmentioning

confidence: 99%

Influence of PAO@PSF microcapsules on the tribological properties of polyvinylidene fluoride matrix recovered from waste membranes

Liang

et al. 2023

Preprint

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“…But the problems of PVDF are high friction coefficient and poor self‐lubricating properties. Therefore, it is worthy to investigate the improvement of tribological properties of PVDF by selecting suitable lubricating fillers for the incorporation into this polymer framework, and thus boosting its tribological application 22–24 . In the recent years, efforts have been put to overcome the limitations of PVDF.…”

Section: Introductionmentioning

confidence: 99%

The sustainable recycling of polyvinylidene fluoride membrane for tribological application

Liang

et al. 2023

J of Applied Polymer Sci

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In the study, the waste polyvinylidene fluoride (PVDF) membranes were recovered and the obtained resin powders by a solvent recovery method were employed for the fabrication of a novel PVDF-based tribological composite.Herein, a new strategy was developed for applying the waste PVDF membranes to fabricate a self-lubricant composite, where the recycled PVDF powders acted as the polymer matrix and microcapsules with the configuration of polysulfone (PSF) capsuling lubricant oil (PAO) served as the filler. The morphologies, crystal phases, chemical components and groups as well as thermal stabilities of fabricated PAO@PSF/PVDF composites were characterized, and the self-lubricating and wear properties of fabricated composites were tested under the dry sliding condition using a ball-on-disc configuration. Experimental results suggest that the PAO@PSF/PVDF composite with an addition of 20 wt% PAO@PSF microcapsules exhibits the best tribological properties, in view of the lowest friction coefficient (0.077) and the smallest wear rate (2.34 Â 10 À15 m 3 /Nm). The incorporation of PAO@PSF microcapsules greatly reduces the friction coefficient of PVDF polymer. The tribological properties of fabricated PAO@PSF/PVDF composite will be expectable to that of the PVDF polymer with the dripping presence of lubricating oil.

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“…PVDF and their composites have seldom been produced by other common techniques used to produce polymeric microspheres with only two references found, one for nanoprecipitation and one for emulsion. 35,36 Microfluidics are miniature fluidic systems composed of reduced channel sizes that originate laminar flows, making them very well suited for the obtention of uniform polymer microspheres. 37,38 These systems possess several advantages when compared to other common methods for polymer microsphere production.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The difficulty of collecting and dispersing the microspheres upon production sometimes hinders their applicability. PVDF and their composites have seldom been produced by other common techniques used to produce polymeric microspheres with only two references found, one for nanoprecipitation and one for emulsion. , …”

Section: Introductionmentioning

confidence: 99%

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Microfluidic Processing of Piezoelectric and Magnetic Responsive Electroactive Microspheres

Martins

Ródenas-Rochina

Salazar

et al. 2022

ACS Appl. Polym. Mater.

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Poly(vinylidene fluoride) (PVDF) combined with cobalt ferrite (CFO) particles is one of the most common and effective polymeric magnetoelectric composites. Processing PVDF into its electroactive phase is a mandatory condition for featuring electroactive behavior and specific (post)processing may be needed to achieve this state, although electroactive phase crystallization is favored at processing temperatures below 60 °C. Different techniques are used to process PVDF−CFO nanocomposite structures into microspheres with high CFO dispersion, with microfluidics adding the advantages of high reproducibility, size tunability, and time and resource efficiency. In this work, magnetoelectric microspheres are produced in a one-step approach. We describe the production of high content electroactive phase PVDF and PVDF−CFO microspheres using microfluidic technology. A flow-focusing polydimethylsiloxane device is fabricated based on a 3D printed polylactic acid master, which enables the production of spherical microspheres with mean diameters ranging from 80 to 330 μm. The microspheres feature internal and external cavernous structures and good CFO distribution with an encapsulation efficacy of 80% and prove to be in the electroactive γ-phase with a mean content of 75%. The microspheres produced using this approach show suitable characteristics as active materials for tissue regeneration strategies and other piezoelectric polymer applications.

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Preparation and oil lubrication of polyvinylidene fluoride (PVDF) nanospheres

Cited by 7 publications

References 40 publications

Influence of PAO@PSF microcapsules on the tribological properties of polyvinylidene fluoride matrix recovered from waste membranes

Influence of PAO@PSF microcapsules on the tribological properties of polyvinylidene fluoride matrix recovered from waste membranes

The sustainable recycling of polyvinylidene fluoride membrane for tribological application

Microfluidic Processing of Piezoelectric and Magnetic Responsive Electroactive Microspheres

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