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Model filled polymers. XIII: Mixing and time‐dependent rheological behavior of polymer melts containing crosslinked polymeric particles
Author(s) -
Sun L.,
Park M.,
Aklonis J. J.,
Salovey R.
Publication year - 1992
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.760321904
Subject(s) - materials science , rheology , polystyrene , dispersity , composite material , polymer , mixing (physics) , methyl methacrylate , shear rate , shear (geology) , polymer chemistry , polymerization , physics , quantum mechanics
The rheological properties of polystyrene (PS) and poly(methyl methacrylate) (PMMA) composites filled with monodisperse sized crosslinked polymeric particles are sensitive to processing history and chemical composition. Particles compatible with the matrix, such as PMMA or copolystyrene‐vinylphenol in a PMMA matrix, are randomly dispersed on mixing, yielding (almost) Newtonian fluids. Particles incompatible with the matrix, such as PS or copolystyrene‐acetoxystyrene in PMMA, produce composites whose steady shear viscosities depend on shear rate and whose dynamic moduli are elevated at low frequency. Particles in incompatible composites tend to cluster, producing a structure that is destroyed at high shear rates and that reforms on aging at elevated temperatures.