MACROMOLECULAR
DIVISION
COMMISSION ON POLYMER CHARACTERIZATION AND PROPERTIES
WORKING PARTY ON STRUCTURE AND PROPERTIES OF
COMMERCIAL POLYMERS
Blends containing core-shell impact modifiers Part 2. Melt rheology
of rubber-toughened plastics (IUPAC Technical Report)
M. Kozlowski1 and C.
B. Bucknall*2
1Wroclaw Technical University, Wybrzeze Wyspianskiego
27, PL 50-370 Wroclaw, Poland; 2Advanced Materials Department, Cranfield
University, Bedford MK43 0AL, UK
Abstract: The influence of impact modifiers composed of an elastomer-based
core and a poly(methyl methacrylate) (PMMA) shell on the melt flow properties
of different thermoplastics has been studied, using both steady-state
and dynamic viscosity measurements. The melt viscosities of the rubber-toughened
blends were similar to those of the matrix polymers, over the range
of shear rates commonly applied during melt processing. In the case
of the matrix polymers, viscosity curves obtained under dynamic conditions
coincided with those obtained under steady-state conditions. However,
for blends the two curves show a slight divergence at low strain rates,
where yielding is observed.
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> Link to Part 1: Structure and tensile
deformation mechanisms
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*Corresponding author
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