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Rheological properties of polyurethane adhesives containing silica as filler: influence of the nature and surface chemistry of silica
Author(s) -
TorróPalau Ana M.,
FernándezGarcía Juan C.,
OrgilésBarceló A. César,
del Pilar FerrándizGómez Teresa,
MartínMartínez José Miguel
Publication year - 2001
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200105)169:1<191::aid-masy191>3.0.co;2-q
Subject(s) - fumed silica , thixotropy , adhesive , rheology , polyurethane , materials science , hydrophobic silica , precipitated silica , filler (materials) , chemical engineering , solvent , viscosity , composite material , polymer chemistry , chemistry , organic chemistry , layer (electronics) , natural rubber , engineering
Four silicas, two fumed silicas (one hydrophilic and one hydrophobic) and two precipitated silicas (one hydrophilic and one hydrophobic), were added as filler to solvent‐based polyurethane (PU) adhesive formulations. In general, the addition of silica increased the viscosity, the storage and loss moduli of the PU adhesives but only the hydrophilic fumed silica exhibited pseudoplasticity and thixotropy. The rheological properties imparted by adding filmed silicas to PU adhesive solutions were more noticeable than that of precipitated silicas. Interactions between the hydrophilic fumed silica, the polyurethane and/or the solvent seemed to be responsible for the improved rheological properties of filled PU adhesives.