Enhanced Energy Storage Property of Polypropylene/ N-Benzene Based Maleamidic Acid Grafted Polypropylene/Nano-ZrO2

A ternary polypropylene composite co-doped with N-benzene based maleamidic acid(PMA) grafted polypropylene (PP-g-PMA) and nano-ZrO
₂
was studied on its morphology and energy storage properties. The introduction of PP-g-PMA largely improved the dispersion of nano-ZrO
₂
, while high content of nano-ZrO
₂
suppressed the formation of β-crystal. Direct Current(DC) breakdown strength of ternary PP was enhanced obviously comparing with the traditional binary PP/nano-ZrO
₂
composites. Besides the permittivity of ternary PP was also increased. Consequently, the energy density of PP/PP-g-PMA/nano-ZrO
₂
composites was enhanced by 39.4% with 1.5 wt% nano-ZrO
₂
doped compared to isotactic PP, while this improvement was only 5.1% of the traditional battery PP composite-PP/nano-ZrO
₂
. Meanwhile, all composites exhibited an extremely low dielectric loss that below 0.01, providing a large potential for the practical application in power system.