A new statistical point of view to choose a better linear model for reactivity and microstructure analysis in hema/furfuryl acrylate copolymerization process

Abstract

Copolymers of 2-hydroxyethyl methacrylate (E) and furfuryl acrylate (A) were prepared by free radical polymerization in toluene at 80°C using benzoyl peroxide as initiator. Copolymers were analyzed by 1H-NMR in order to calculate the monomer composition in the copolymer. The monomer reactivity ratios were determined by four linear methods, Fineman-Röss, r1 = 1.33/r2 = 0.96; Fineman-Röss inverted, r1 = 1.27/r2 = 0.92; Kelen-Tüdos, r1 = 1.3/r2 = 0.96 and Kelen-Tüdos extended, r1 = 0.9982/r2 = 1.0004. Akaike Information Criterion was used to select the best r1-r2 pair of values. Dyads and triads confirm the average chain and copolymers type and lead to use a mathematical relationship to calculate a new r1-r2 par of values. The new values were r1 = 1.254/r2 = 1.08 from the dyads and r1 = 1.26/r2 = 1.07 from the triads. Other microstructure parameters such as run number (RN = 46.48, X = 1, one A units triads) and Q-e values for A, not reported before (e2 = 0.10 and Q2 = 1.68) were calculated. © 2013 VBRI press.