Influence of physical properties and peroxide decomposition products on the space charge formation in XLPE and EPDM

Distributions of space charges formed under DC voltage in LDPE, XLPE and EPDM were studied using pulsed electroacoustic methods. The material density of LDPE was found to affect the space charge distribution, whereas the MFR shows no influence. Heterocharges are created in XLPE containing peroxide decomposition products, while homocharges are formed in the absence of decomposition products. It was confirmed that the space charge profiles change when the time duration of voltage application changes. Moreover, the heterocharge was produced in the vicinity of the negative electrode in non cross-linked EPDM. Taking account of the results of FTIR analysis, the contribution of acetophenone on the space charge formation in XLPE and EPDM was examined.