 חברת MALVERN מציגה מערכות חדשות למדידות צמיגות ותכונות
ריאולוגיות.
The measurement of viscoeleastic properties of polymers
and plastics are most commonly done on dilute solutions
or molten polymers, and are critical for determining
molecular architecture (molecular weight, molecular
weight distribution, and degree of branching), processing
behavior and end product performance.
Malvern Instruments present a new range of instruments
for the measurement of rheological properties:
viscoelasticity (G?, G??, tan delta) as a function of
frequency (time) and temperature
molecular architecture (molecular weight, molecular
weight distribution, branching) using frequency sweeps
and creep/recovery tests (zero shear viscosity)
influence of long chain branching on linear viscoelastic
properties (zero shear viscosity, steady state
recoverable compliance)
shear viscosity from low to high shear rates, directly
simulating conditions experienced during processing
melt fracture, die swell, and shark skin which are often
due on elastic properties that manifest themselves at
high shear rates during processing
extensional viscosity and/or melt strength, which become
important parameters to measure for many polymer
processes
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