Chemistry Reference
In-Depth Information
300
G
1
= 30 Pa
h
1
= 2
τ
1
= 100 s
G
2
= 275 Pa
h
2
= 0.8
τ
2
= 0.33 s
250
200
G′(ω)
150
100
G
″
(
ω
)
50
0
0.001
0.01
0.1
1
10
100
/rads
-1
ω
Figure 5.32
A plot of the storage and loss moduli for a PVA gel (symbols). The data
has been curve fit using two log normal distributions (see Section 4.4.5).
Figure 5.31. This is achieved readily in acid conditions. Naturally occurring
polysaccharides can be crosslinked by a wide range of divalent ions, cobalt for
example will crosslink hydroxypropyl guar. The specificity of the interactions
means that a prediction of the rheological behaviour has to allow for the
detailed chemistry of the polymer.
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