The rheological characteristics of
anionic colloidal unimolecular
polymer (CUP) particles in water were investigated. The intrinsic
viscosities were determined for CUPs with different molecular weights
as a function of volume fraction. The specific viscosities were measured
and fit with models considering hydrodynamic interaction and electroviscous
effects. The rheological characteristics were consistent with a surface
layer of water which increases with the particle size or molecular
weight of CUPs. The effective charges on the surface of particle were
calculated and correlated with the rheological behavior of the CUP
particles from the dilute to semidilute range, a volume fraction of
0.0001–0.08.
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