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Data on typical glass transition temperatures of polymers are given in Table 3.1 [9].
The power law exponent n can be obtained from Equation 1.39:
For high shear rates n becomes [12]
n =
Example
1
1-C
Following constants are given for a specific LDPE:
A = 32400 Pa • s
B = 3.1s
C = 0.62
TST = -133 0 C
T1 = 190 0 C
The viscosity is to be calculated at
T2 = 200 0 C and fa = 500 s" 1 .
Solution
From Equation 1.40 one obtains
and
The power law exponent is calculated from Equation 1.42
where
(1.42)