Formation and characterization of polytetrafluoroethylene nanofiber membranes for high-efficiency fine particulate filtration

Xu, Huan; Jin, Wanqin; Wang, Feng; Liu, Guojin; Li, Chengcai; Wang, Jieqi; Zhu, Hongliang; Guo, Yuhai

doi:10.1039/c9ra01643k

Cited by 46 publications

(25 citation statements)

References 56 publications

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“…Recently, successful hydrophilic coating of PTFE has been undertaken by Zhao et al 2019 [33], Li et al 2019 [34], and Villabos-Garcia et al 2018 [35], but also in the past by Song et al 2017 [36], Park et al 2015 [37], Mansouri et al 1999 [38], and Prasad et al 1987 [39], focusing, however, on different membrane applications. Although PTFE is a difficult polymer to work with and has little compatibility with other polymers, PVA from previous studies has worked satisfactorily with PTFE electrospun membranes [40][41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Flux Performance in PTFE Membranes for Direct Contact Membrane Distillation

et al. 2020

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This work focused on enhancing the flux on hydrophobic polymeric membranes aimed for direct contact membrane distillation desalination (DCMD) process without compromising salt rejection efficiency. Successful coating of commercial porous poly-tetrafluoroethylene membranes with poly(vinyl alcohol) (PVA) was achieved by solution dipping followed by a cross-linking step. The modified membranes were evaluated for their performance in DCMD, in terms of water flux and salt rejection. A series of different PVA concentration dipping solutions were used, and the results indicated that there was an optimum concentration after which the membranes became hydrophilic and unsuitable for use in membrane distillation. Best performing membranes were achieved under the specific experimental conditions, water flux 12.2 L·m-2·h-1 [LMH] with a salt rejection of 99.9%. Compared to the pristine membrane, the flux was enhanced by a factor of 2.7. The results seemed to indicate that introducing hydrophilic characteristics in a certain amount to a hydrophobic membrane could significantly enhance the membrane distillation (MD) performance without compromising salt rejection.

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Section: Introductionmentioning

confidence: 99%

Enhancement of Flux Performance in PTFE Membranes for Direct Contact Membrane Distillation

et al. 2020

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“…Additionally, nanoscale pores were observed on the surface of PTFE–PAI nanofibers, especially in Figure 3 c’. That could be attributed to the decomposition of PEO, which left voids in the body of PAI–PTFE nanofiber [ 37 ]. No nanoscale pores could be left after the removal of PEO for the PTFE–PEO nanofiber, due to the molten PTFE NPs were tightly held together by the cohesion force.…”

Section: Resultsmentioning

confidence: 99%

Preparation of PI/PTFE–PAI Composite Nanofiber Aerogels with Hierarchical Structure and High-Filtration Efficiency

Liu

Shen

et al. 2020

Nanomaterials

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Electrospun nanofiber, showing large specific area and high porosity, has attracted much attention across various fields, especially in the field of air filtration. The small diameter contributes to the construction of filters with high-filtration efficiency for fine particulate matter (PM), however, along with an increase in air resistance. Herein, composited nanofiber aerogels (NAs), a truly three-dimensional (3D) derivative of the densely compacted electrospun mat, were constructed with the blocks of polytetrafluoroethylene–polyamideimide (PTFE–PAI) composite nanofiber and polyimide (PI) nanofiber. PI/PTFE–PAI NAs with hierarchically porous architecture and excellent mechanical properties have been obtained by thermally induced crosslink bonding. Results indicated that sintering at 400 °C for 30 min could complete the decomposition of polyethylene (PEO) and imidization of polyamic acid (PAA) into PI, as well as generate sufficient mechanical bonding between adjacent nanofibers in the NAs without extra additive. The well-prepared PI/PTFE–PAI NAs could withstand high temperature up to 500 °C. In addition, the filtration tests illustrated that the composite NAs had an excellent performance in PM filtration. More importantly, the filtration behavior could be adjusted to meet the requirements of various applications. The excellent thermal stability and high-filtration efficiency indicated its great potential in the field of high-temperature air filtration.

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“…Figure displays the XRD patterns of PPS, PA66, and PPS/PA/PTFE composites under the conditions of CIM and TIM. The peak located at 2θ = 18.1° is considered as the crystalline phase of PTFE, which is indexed to the (100) plane . PPS shows two main diffraction peaks (2θ = 18.6°, 20.6°), which are attributed to the (110) and (102) (200) (111) planes of the orthorhombic structure .…”

Section: Resultsmentioning

confidence: 99%

In Situ Microfibrillation of Polyamide 66 and Construction of Ordered Polytetrafluoroethylene Fibers to Significantly Reduce the Friction Coefficient of Polyphenylene Sulfide

Shi

Liang

Zou

et al. 2020

Ind. Eng. Chem. Res.

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Self-lubricating polyphenylene sulfides (PPS) were obtained by in situ construction of the ordered polyamide 66 (PA) microfibrillar structure and polytetrafluoroethylene (PTFE) fibers, as induced by high-shear force fields in thin-wall injection molding (TIM). The average friction coefficient and specific wear rate of PPS/PA/PTFE20 composites reached 0.114 and 7.149 × 10–6 mm3/Nm, respectively, of which the former is 27.4% lower than that obtained from conventional injection molding. The worn surface of PPS/PA/PTFE composites prepared by TIM displayed a much smoother and more stable transfer film coupling with the homo-dispersed F element, which greatly improves the tribological properties of subsequent moldings. This study provides a novel perspective for improving the tribological performance of engineering plastics by systematically tailoring the microstructure.

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Formation and characterization of polytetrafluoroethylene nanofiber membranes for high-efficiency fine particulate filtration

Abstract: Polytetrafluoroethylene (PTFE) porous membranes are widely used for high-temperature filtration.

Cited by 46 publications

References 56 publications

Enhancement of Flux Performance in PTFE Membranes for Direct Contact Membrane Distillation

Enhancement of Flux Performance in PTFE Membranes for Direct Contact Membrane Distillation

Preparation of PI/PTFE–PAI Composite Nanofiber Aerogels with Hierarchical Structure and High-Filtration Efficiency

In Situ Microfibrillation of Polyamide 66 and Construction of Ordered Polytetrafluoroethylene Fibers to Significantly Reduce the Friction Coefficient of Polyphenylene Sulfide

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