Abstract
The radical copolymerization of citraconic anhydride (CAn) with styrene (St) was carried out in benzene solution at 70 °C. UV spectroscopy confirmed the presence of a 1:1 charge-transfer complex between CAn and St in the copolymerization system. The copolymerization of CAn with St was described by using the terminal model, penultimate model and complex participation model. The Joshi–Joshi, Fineman–Ross, Kelen–Tüdo ̋ s and Ezrielev–Brokhina–Roskin methods were used to determine the reactivity ratios in terminal model. It has been found that the terminal model is the adequate description of copolymerization mechanism, although the complex participation model predictions can also explain copolymer compositions at equimolar feed composition. From the calculated reactivity ratios, the Q and e values for citraconic anhydride were calculated, as well as the sequence distribution in copolymers. The sequence distribution was studied by 1H NMR.
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