We have examined the effects of acetophenone andα-methylstyrene on the space charge evolution in PE. The samplestested are additive-free LDPE sheets. The important conclusions obtainedare as follows: (1) Positive charges are easy to migrate from thebyproduct-existing region to the non-existing region while negativecharges are difficult. (2) Positive charge migration is easier in theLDPE sheet soaked into α-methylstyrene than in the one soaked intoacetophenone, which is probably due to the difference in permeationvelocity of the two byproducts. (3) The values of mobility andconductivity calculated from the space charge profiles agree with theassumption that ionic carriers are responsible for the conduction in thebyproduct-existing region
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