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Wilhelmy plate studies of carbon fiber/viscous fluid systems
Author(s) -
Giannotta G.,
Morra M.,
Occhiello E.,
Garbassi F.,
Nicolais L.,
D'amore A.
Publication year - 1993
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.750140307
Subject(s) - wilhelmy plate , wetting , viscosity , viscoelasticity , surface tension , rheology , materials science , contact angle , composite material , thermodynamics , physics
The use of Wilhelmy plate techniques for studying the interactions of fibers with fluids of variable viscosity is discussed. The influence of hydrodynamic effects of force ( F ) VS. DEPTH ( z ) plots is interpreted on the basis of surface tension‐independent added terms of the constitutive equation of the Wilhelmy experiment. Wetting experiments using pseudoplastic fluids (polyethyleneglycol/water solution) show that viscoelasticity is indeed important in the interpretation of Wilhelmy plate experiments. The comparison of wetting experiments performed on untreated and plasma‐treated carbon fibers showed that at low stage speed and fluid viscosity, surface chemistry and morphology determines contact angles. At higher stage speeds and viscosities and advancing and receding angles are affected by surface chemistry‐independent and hydrodynamics‐dependent added contributions.