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Model‐Filled polymers. III: Rheological behavior of polystyrene containing cross‐linked polystyrene beads
Author(s) -
Park M.,
Gandhi K.,
Sun L.,
Salovey R.,
Aklonis J. J.
Publication year - 1990
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760301808
Subject(s) - materials science , polystyrene , rheology , composite material , dispersity , polymer , bead , divinylbenzene , yield (engineering) , volume fraction , polymer chemistry , styrene , copolymer
The steady shear viscosity and dynamic moduli, at 180 and 200°C, of polystyrene composites, containing cross‐linked monodisperse polystyrene beads varying in diameter from 0.2 to 0.8 μm, are independent of bead size and cross‐link density, but increase with the volume fraction of beads. Steady shear viscosities exhibit power‐law regions up to 40% concentration of beads, but no yield stress. Storage and loss moduli are initially linear with frequency, on double logarithmic plots, with limiting slopes of 1.3 and 0.9, respectively. Uncross‐linked beads and beads cross‐linked with 0.1% divinylbenzene are destroyed by thermomechanical dispersion in the melt.