Fabrication of ultrafine fibrous polytetrafluoroethylene porous membranes by electrospinning

Xiong, Jie; Huo, Pengfei; Ko, Frank

doi:10.1557/jmr.2009.0347

Cited by 66 publications

(44 citation statements)

References 33 publications

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“…23 The solution was electrospun into composite nanofibers, then sintered to obtain a PTFE porous membranes . The membranes exhibited good thermal stability and strong hydrophobicity.…”

Section: Poly(tetrafluoroethylene)mentioning

confidence: 99%

Membrane Materials

2015

Membrane-Assisted Crystallization Technology

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The membrane itself represents the core of a membrane crystallizer. Although a quite large variety of membranes exists (depending on their different morphology, topology, mass and energy transport properties, selectivity, and separation mechanism), microporous hydrophobic membranes are usually required for membrane crystallization (MCr) operations. However, in principle, any surface is suitable for promoting a controlled heterogeneous nucleation phenomenon. According to the most traditional classification, synthetic membranes are divided into organic (polymeric) and inorganic membranes; within the same class, different properties are originated by dissimilar raw materials or preparation methods.At present, due to their easy processability on industrial scale and possibility to properly modulate their physico-chemical properties, polymeric membranes have attracted much more interest than inorganic ones. The most significant exception probably concerns the use of ceramic membranes in high-temperature separation and emulsification processes. Membrane PolymersThe selection of a polymeric material is preliminarily driven by the necessity to achieve a high chemical and thermal stability. Moreover, preparation methods and related characteristics of the resulting membranes critically limit the choice of materials. It is beyond the scope of this book to give details on such an extremely complex matter, and readers are referred to specific handbooks and literature papers in this field. 77 Membrane-Assisted Crystallization Technology Downloaded from www.worldscientific.com by NATIONAL UNIVERSITY OF SINGAPORE on 10/09/15. For personal use only.78 Membrane-Assisted Crystallization Technology MEMBRANES SYMMETRIC ASYMMETRIC HOMOGENEOUS DENSE FILM POROUS SPONGE-TYPE COMPOSITE INTEGRAL Porous skyn layer Dense skyn layer

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“…23 The solution was electrospun into composite nanofibers, then sintered to obtain a PTFE porous membranes . The membranes exhibited good thermal stability and strong hydrophobicity.…”

Section: Poly(tetrafluoroethylene)mentioning

confidence: 99%

Membrane Materials

2015

Membrane-Assisted Crystallization Technology

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“…Pyrolysis of one component of the block copolymers or the polymer colloids results in a porous structure . Peng et al showed that ultrathin carbon fibers with nanoporous structure throughout the surface and the interior of the fibers were obtained by electrospinning a mixture of PAN and a copolymer of acrylonitrile and methyl methacrylate (poly(AN‐co‐MMA)) in DMF followed by oxidizing (260–300°C, 2 h) and carbonizing (under the protection of nitrogen, 800°C, 4 h) the fibers.…”

Section: Introductionmentioning

confidence: 99%

Preparation of porous nylon 6 fiber via electrospinning

Zhang

Jia

et al. 2014

Polymer Engineering & Sci

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Porous nylon‐6 fibers were obtained by electrospinning of ultra‐high molecular polyamide 6 (UHMW‐PA6). First, UHMW‐PA6/calcium formate composite nanofibers were prepared as precursors by electrospinning UHMW‐PA6 solutions containing different contents of calcium formate particles. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to examine the surface morphology and inner structure of composite nanofibers. It was found that calcium formate particles were distributed both inside and on the surface of nanofibers. Fourier transform infrared (FTIR), differential scanning calorimetry, and thermal gravimetric analysis (TGA) were used to study the structure and properties of these nanofibers. Then, porous UHMW‐PA6 nanofibers were obtained by soaking the electrospun web in water for 24 h, to remove calcium formate particles. The removal of calcium formate particles was confirmed using FTIR and TGA tests. SEM and TEM observations revealed the formation of porous structure in these nanofibers. In addition, CaCl2 was used instead of calcium formate to prepare the UHMW‐PA6 nanoporous fiber. POLYM. ENG. SCI., 55:1133–1141, 2015. © 2014 Society of Plastics Engineers

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“…So it needs more time and energy to remove the fiber-forming polymer in the following sintering processes. Xiong 14 in china prepared spinning solution by blending PVA and PTFE emulsion with different mass concentrations. Then the spinning dope was electrospun into composite nanofibers, whereby the PTFE porous membranes were obtained after sintering.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of polytetrafluoroethylene/CaCO₃ hybrid hollow fiber membranes

Huang

Xiao

2011

J of Applied Polymer Sci

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A novel method of preparing polytetrafluoroethylene (PTFE) hollow fiber membrane was presented by utilizing poly (vinyl alcohol) (PVA) can form a gel of two dimensional complex compounds with Boric acid (H 3 BO 3 ). Effects of H 3 BO 3 on PTFE nascent hollow fiber were investigated, and the results showed that the introduction of H 3 BO 3 effectively reduced the addition of PVA. The configuration named ''fibril'' formed between PVA and H 3 BO 3 could be observed in nascent hollow fiber by SEM (Scanning electronic microscopy). Furthermore, Calcium carbonate (CaCO 3 ) particles (60 nm$ 90 nm) were introduced into PTFE matrix. The interfacial microvoids (IFMs) which were different from the PTFE sintering or node-fibril network structure were obtained. The assumption of the IFMs formation was proposed in this study. Effects of CaCO 3 amount and draw ratios on structure and properties of hybrid hollow fiber membranes were analyzed, and the SEM results showed that the IFMs quantity and diameter improved with draw ratio increasing.

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Fabrication of ultrafine fibrous polytetrafluoroethylene porous membranes by electrospinning

Cited by 66 publications

References 33 publications

Membrane Materials

Membrane Materials

Preparation of porous nylon 6 fiber via electrospinning

Preparation and properties of polytetrafluoroethylene/CaCO₃ hybrid hollow fiber membranes

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Fabrication of ultrafine fibrous polytetrafluoroethylene porous membranes by electrospinning

Cited by 66 publications

References 33 publications

Membrane Materials

Membrane Materials

Preparation of porous nylon 6 fiber via electrospinning

Preparation and properties of polytetrafluoroethylene/CaCO3 hybrid hollow fiber membranes

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Product

Resources

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Preparation and properties of polytetrafluoroethylene/CaCO₃ hybrid hollow fiber membranes