403 / 2022-03-15 20:22:39

Effect of UV irradiation crosslinking on dielectric properties of polypropylene films for power capacitors

polypropylene,UV irradiation,crosslink

The thermal motion of the molecular chains in the amorphous region of polypropylene (PP) is intensified at high temperature, resulting in the rapid decline of its breakdown strength, which limits the application of metallized film capacitors in high temperature environment.The study found that UV irradiation can produce crosslinked structure between polypropylene molecular chains,which inhibit the thermal movement of molecular chains.In this paper, the degree of cross-linking between polypropylene molecular chains is enhanced by UV irradiation of polypropylene system, so as to improve the high temperature dielectric properties of polypropylene.