The Dielectric Properties of Polypropylene Grafting with Methyl Methacrylate

Grafted-modified polypropylene (PP) has been studied widely due to thermostability and hard breakdown. The dielectric properties of grafted polypropylene affect the long-time usage directly in AC voltage. In this paper, methyl mechacrylate grafted polypropylene (PP-g-MMA) in different grafting proportions were prepared by water-solid phase suspension grafting method. The wide frequency dielectric spectrometer was used to test the dielectric properties of PP-g-MMA, including permittivity and dielectric loss. The results have shown that the overall trend of permittivity and dielectric loss tangent $(\text{tan}\delta)$ of PP-g-MMA is similar at different temperature. The permittivity increases with the increasing grafting proportion. With the increasing grafting proportion, the $\text{tan}\delta$ of PP-g-MMA increases in the low frequency, and decreases in the middle and high frequency. It lays the foundation for the subsequent study in properties and parameters.