Microemulsion and conventional emulsion copolymerizations of methyl methacrylate with acrylonitrile

摘要

The microemulsion (M.E.) and conventional emulsion (C.E.) copolymerizations of methyl methacrylate (MMA) with acrylonitrile (AN) are carried out at 70 deg C by employing sodium lauryl sulphate (SLS) and n-heptanol (HA) as surfactant and cosurfactant, respectively, and potassium persulphate (KPS) as initiator. The copolymerization reaction are arrested at lower conversions and the copolymers prepared re characterized by FTIR, NMR, TG/DTA and GPC techniques. The reactivity ratios for microemulsion and conventional emulsion copolymerizations are evaluated by Fineman-Ross (F-R), Kelen-Tudos (K-T) and Mayo-Lewis (M-L) graphical methods. The K-T method yields the reactivity ratios of MMA (rMMA) and AN(rAN) as 2.28 +- 0.02 and 0.12 +- 0.02, and 2.42 +- 0.02 and 0.12 +- 0.02, respectively, for M.E. and C.E. copolymeization methods.