Parallel oscillatory test results demonstrated that the G0
and G00 of pure PBS and the PBS/nano-CaCO3 composites
increased with an increase of frequency. The G0 < G00 over
the frequency range showed the viscous behavior for the
samples. The h* of all the samples showed the characteristic
of a Newtonian fluid with the value of h* remaining almost
constant when the frequency was not more than 0.25 rad/s.
A strong shear thinning effect was observed for all the
samples when the frequency exceeded 0.25 rad/s.
Compared to pure PBS, the torque of PBS/nano-CaCO3
composites was increased significantly, the effect was
enlarged with an increase in nano-CaCO3 content when the
frequency exceeded 10 rad/s. Furthermore, the results
showed that the nano-CaCO3 particles had little influence
on the microstructure of PBS; the microstructure and the
relaxation mechanism of the PBS/nano-CaCO3 composites
mainly depended on the PBS matrix