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Many experimental results have revealed that entanglement networks of molecular chain would undergo the orientation, deformation, and breakdown under the condition with shear field, forming a new conformation with much reduced entanglement interactions with the surrounding medium. In this

Highly filled polymers with low viscosity and high melt flow rate (MFR) are in great demand for favorable processability. Disentanglement by the treatment of external processing fields usually can reduce the viscosity to meet the processing requirements. This work tries to evaluate the influence of hexagonal boron nitride (BN) on the kinetics of isotactic polypropylene (PP) entanglement recovery. The results show that polypropylene/boron nitride (PP/BN) composites after the shear experiment on a parallel-plate rotational rheometer can be kept in a low-viscosity state for a long time, indicating that the presence of BN effectively maintains the disentangled state of PP/BN composites. At the same time, the MFR of PP/BN composites with a diameter of 15 μm BN, which has the best effect of inhibiting entanglement recovery, increases from 1.62 to 3.51 g/10 min after the shear experiment. As for PP, the complex viscosity quickly recovers to its original state and the MFR has no obvious change. Consequently, it is possible to realize highly filled polymer disentanglement to meet the post-processing.