Title: Microemulsion and Conventional Emulsion Copolymerizations of Styrene with n-Butyl Methacrylate, and Characterization of the Copolymers
Authors: Reddy, G V Ramana; Balaji, T S; Kannan, P
Abstract: Microemulsion (ME) and conventional emulsion
(CE) copolymerization of styrene (STY) with n-butyl methacrylate (BMA) were carried
out at 70oC under inert atmosphere with sodiumlauryl sulphate (SLS)
as surfactant, n-hexanol (HA) as cosurfactant and potassium persulphate (KPS)
as the free radical initiator. Five monomer mixtures in the initial reaction mixtures
were used and the reactions were arrested at lower conversions. The copolymers thus
obtained were characterized by FTIR, NMR, TG/DTA, GC and GPC. The monomer
composition of the copolymers were evaluated from the 1HNMR spectral
data. The reactivity
ratios for the ME and CE copolymerization
of styrene (STY) (rSTY) with n-butyl methacrylate (BMA) (rBMA)
as determined by Fineman-Ross (F-R), Kelen-Tudos (K-T) and Mayo-Lewis (M-L) methods
were 0.74±0.02 and 0.64±0.02, and 0.58±0.02 and 0.39 ±0.02, respectively.
Page(s): 336-343
↧