The photoinitiated (at wavelength λ = 365 nm) terpolymerization of acrylonitrile, maleic anhydride and styrene in the presence and/or absence of additives such as ZnCl2 or N,N‐dimethylaniline (DMA) in acetone was studied, and the relative reactivities R of maleic anhydride and acrylonitrile towards a styryl radical were determined. In the presence of ZnCl2 and/or DMA, the relative reactivities R are by about 40% lower than the value of R (= 13,3 ± 2,1) for the terpolymerization system without additives.
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Capek et al. (1981) studied this question.
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