Representation of the rheological properties of polymer melts in terms of complex fluidity |
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Authors: | V Verney A Michel |
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Institution: | (1) C.N.R.S., Laboratoire des Matériaux Organiques, BP. 24, F-69390 Vernaison, France |
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Abstract: | In dynamic rheological experiments melt behavior is usually expressed in terms of complex viscosity
*
() or complex modulusG
*
(). In contrast, we attempted to use the complex fluidity
*
() = 1/µ
*
() to represent this behavior. The main interest is to simplify the complex-plane diagram and to simplify the determination of fundamental parameters such as the Newtonian viscosity or the parameter of relaxation-time distribution when a Cole-Cole type distribution can be applied.
*
()
complex shear viscosity
-
()
real part of the complex viscosity
-
()
imaginary part of the complex viscosity
-
G
*
()
complex shear modulus
-
G()
storage modulus in shear
-
G()
loss modulus in shear
-
J
*
()
complex shear compliance
-
J()
storage compliance in shear
-
J()
loss compliance in shear
-
shear strain
-
rate of strain
-
angular frequency (rad/s)
-
shear stress
-
loss angle
-
*
()
complex shear fluidity
-
()
real part of the complex fluidity
-
()
imaginary part of the complex fluidity
-
0
zero-viscosity
-
0
average relaxation time
-
h
parameter of relaxation-time distribution |
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Keywords: | Melt rheology complexviscosity complexfluidity polypropylene polyethylene polystyrene |
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