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7.2.4. PAAM: Molecular
characteristics:
•
C-C chain: Random coil with low C
∞
•
COO
-
: Polyanionic, large expansion factor (α
2
)
•
Salt sensitive, esp. Ca
++
(Collapse at high ionic strength)
•
Shear sensitive
•
Amide unstable at high T (more hydrolysis)
•
Very high molecular weights (M
w
> 10
6
Da)
PAAM (20% AA) in 0.5 M NaCl: Molecular weight dependence of the intrinsic
viscosity: