▁chem istry , ▁as ▁an ▁et chant , ▁and ▁as ▁a ▁clean ing ▁and ▁ble aching ▁agent . ▁ ▁The ▁dissol ution ▁of ▁the ▁salt ▁in ▁water ▁is ▁an ▁end oth erm ic ▁process . ▁ ▁Pre par ation ▁Am mon ium ▁pers ulf ate ▁is ▁prepared ▁by ▁electro ly s is ▁of ▁a ▁cold ▁concentr ated ▁solution ▁of ▁either ▁am mon ium ▁sul f ate ▁or ▁am mon ium ▁bis ulf ate ▁in ▁sul fur ic ▁acid ▁at ▁a ▁high ▁current ▁density . ▁The ▁method ▁was ▁first ▁described ▁by ▁Hugh ▁Marshall . ▁ ▁Us es ▁As ▁an ▁ox id izing ▁agent ▁and ▁a ▁source ▁of ▁radical s , ▁A PS ▁finds ▁many ▁commercial ▁applications . ▁ ▁Sal ts ▁of ▁sul f ate ▁are ▁mainly ▁used ▁as ▁radical ▁initi ators ▁in ▁the ▁polym er ization ▁of ▁certain ▁al ken es . ▁Com mer cially ▁important ▁polym ers ▁prepared ▁using ▁pers ulf ates ▁include ▁sty rene - but ad iene ▁rub ber ▁and ▁pol yt etra flu oro eth yl ene . ▁ ▁In ▁solution , ▁the ▁di an ion ▁dis soci ates ▁to ▁give ▁radical s : ▁[ O 3 SO – OS O 3 ] 2 − ▁▁▁ 2 ▁[ SO 4 ] • − ▁The ▁sul f ate ▁radical ▁adds ▁to ▁the ▁alk ene ▁to ▁give ▁a ▁sul f ate ▁est er ▁radical . ▁ ▁It ▁is ▁also ▁used ▁along ▁with ▁t et ram eth yle thy len ed iam ine ▁to ▁catal y ze ▁the ▁polym er ization ▁of ▁ac