Delphine L. Tillier, Jan Meuldijk, Pieter C. M. M. Magusin, Alex M. van Herk and Cor E. Koning
Crosslinking of artificial latices based on EPM and/or EPDM has not thoroughly been studied yet. Moreover, it is a prerequisite for the formation of a poly(methyl methacrylate) shell. Therefore, the aim of this article is to improve the general understanding of the chemistry involved in the crosslinking process. This work especially emphasizes the influence of the initiation method, that is, by a peroxide or a pulsed electron-beam, on crosslinking efficiency. The efficiency of various peroxides is also reported. The incorporation of a coagent, for example, divinylbenzene, into the EP(D)M phase was studied on a microscopic level by solid-state 13C and 1H NMR. The efficiency of crosslinking initiated by a pulsed electron-beam was improved to a great extent by the presence, in the aqueous phase, of potassium nitrosodisulfonate, also referred to as Fremy salt. MALDI-TOF-MS was used to determine the influence of electron-beam irradiation on the chemical stability of surfactants.