As a result, fewer polymer chains
remained in the entanglement state for a sufficiently long
time, which caused the drop in h*. Furthermore, the
abnormal change of h* for sample PBSn9 when the frequency
was not more than 10 rad/s may due to the poor
dispersion of the nano-CaCO3 particles in the PBS matrix.
Also regarding the sample PBSn9, the shear thinning effect
was weakened when the frequency exceeded 10 rad/s,
which may also illustrate that there were nano-CaCO3 agglomerates
in the PBS matrix.