Surface flashover of cross-linked polystyrene material in vacuum

The vacuum surface tests of cross-linked polystyrene material were carried out. Relations between the vacuum surface flashover voltage and the molecular chain structure and inner impurities of the material were respectively investigated. The results show that with the increasing of cross-linking degree, the vacuum surface flashover voltage first increases and then decreases. The structure of the cross-linked polystyrene material has an important effect on the vacuum surface flashover voltage. Moreover, the surface flashover voltage has relevance to the amount of hetero-structured molecules in the cross linked material, and the existence of the hetero-structured molecules leads to the reduction of the flashover voltage.