TITLE

Creating Pathways in Subsurface of PFA/Aerosil Composite Membranes as a Way of Achieving Fluid Transport

AUTHOR(S)
Salejova, Gabriela; Kang Li; Livingston, Andrew G.; Bismarck, Alexander
PUB. DATE
March 2012
SOURCE
Journal of Materials Science & Engineering A;2012, Vol. 2 Issue 3, p273
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Melt processing throughout the assistance of torque rheometer is proposed as an alternative route for melt processable thermoplastic fluoropolymer Hyflon� perfluoroalkoxy (PFA) to be compounded with nano-sized Aerosil�. Fusion behaviour and adhesion between smooth hydrophobic semi crystalline polymer and hydrophobic pyrogenic silica spheres < 14 nm was monitored in form of on-line diagrams during the measurement in measuring mixer. Agglomerate size distribution of silica spheres integrated in polymer matrix was evaluated from scanning electron micrographs taken across depth layers of fabricated composite membrane. Powder X-ray diffraction provided gradual genesis of non-crystallographic morphologies coupled with an increasing ratio of Aerosil incorporated in PFA/Aerosil composite membranes. The hydrophobic interactions at the surface interface between non-sticky polymer and porous silica have led to formation of spaces around the silica agglomerates and thus formation of pathways enabling the mass transport of fluid through the composite membranes. The separation performance of PFA/Aerosil composite membranes prepared by melt processing has been studied in organic solvent nanofiltration (OSN) experiments.
ACCESSION #
76286192

 

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