Unusually high temperature transition and microporous structure of polytetrafluoroethylene fibre prepared through film fibrillation

[Display omitted] •The molecular constraints created through the processes existed in the PTFE fibre.•PTFE fibre has a reversible high temperature transition at 380°C.•The rectangular and rhombus porous structures of PTFE fibre have been produced.•The molecular constraints resulted in forming the mi...

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Bibliographic Details
Published in:European polymer journal 2015-11, Vol.72, p.50-63
Main Authors: Shyr, Tien-Wei, Chung, Wan-Chih, Lu, Wen-Ling, Lin, Ai-Jing
Format: Article
Language:English
Subjects:
Anisotropic optical property
Channels
Crystal structure
Fibre
Fibrillation
Film fibrillation
Melting
Molecular structure
Polytetrafluoroethylene fibre
Polytetrafluoroethylenes
Rectangular porous structure
Rhombus porous structure
Scanning
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Summary:[Display omitted] •The molecular constraints created through the processes existed in the PTFE fibre.•PTFE fibre has a reversible high temperature transition at 380°C.•The rectangular and rhombus porous structures of PTFE fibre have been produced.•The molecular constraints resulted in forming the microporous PTFE fibre. The melting behaviour and structure of polytetrafluoroethylene (PTFE) fibre prepared through film fibrillation were investigated in this study. An unusually high temperature transition of PTFE fibre was observed using a differential scanning calorimeter and a hot stage polarising microscope. The network rectangular porous channel structure framed with fibrils and membranes in the PTFE fibre was obtained after an axial tear failure. It was suggested that the extruding, rolling, and drawing processes be beneficial for molecular constraints between crystals and have contributed to the presence of the unusually high temperature transition of PTFE and the formation of a rectangular porous channel structure in the PTFE fibre. The development of the microporous structure of PTFE fibre is present in diagrams in this paper.
ISSN:0014-3057
1873-1945
DOI:10.1016/j.eurpolymj.2015.08.017