Effect of Stretching Parameters on Structure and Properties of Polytetrafluoroethylene Hollow-Fiber Membranes

Polytetrafluoroethylene (PTFE) porous hollow‐fiber membranes were prepared by a method involving billet preform, paste extrusion, stretching, and sintering. The influence of stretching parameters including stretching ratio, temperature, and speed was systematically investigated. The structure and pr...

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Bibliographic Details
Published in:Chemical engineering & technology 2016-05, Vol.39 (5), p.935-944
Main Authors: Jia, Jingxuan, Kang, Guodong, Cao, Yiming
Format: Article
Language:English
Subjects:
Billets
Field emission
Hollow-fiber membrane
Membranes
Pastes
Polytetrafluoroethylene membrane
Polytetrafluoroethylenes
Porosity
Porous structure
Preforms
Stress-strain curve
Stretching
Stretching parameters
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Summary:Polytetrafluoroethylene (PTFE) porous hollow‐fiber membranes were prepared by a method involving billet preform, paste extrusion, stretching, and sintering. The influence of stretching parameters including stretching ratio, temperature, and speed was systematically investigated. The structure and properties of these membranes were characterized by field emission scanning electron microscopy, filtration performance, and mechanical strength test. The results indicate that the stretching ratio is the most significant influencing factor for the formation of various regions in the stress‐strain curve. With increasing stretching ratio, the porosity, maximum pore size, and ethanol flux increase remarkably while bovine serum albumin rejection is reduced. These findings have the potential to facilitate PTFE membrane fabrication with finely tuned microporous structure for various application processes. Polytetrafluoro‐ethylene porous hollow‐fiber membranes were fabricated by the paste extrusion method. The effects of stretching parameters were systematically investigated by introducing tensile testing equipment, controlling the stretching speed, and monitoring the tensile variation. Membrane fabrication with finely tuned microporous structure for various application processes is facilitated.
ISSN:0930-7516
1521-4125
DOI:10.1002/ceat.201500690