A New Statistical Point Of View To Choose A Better Linear Model For Reactivity And Microstructure Analysis In HEMA/furfuryl Acrylate Copolymerization Process

¹Centro de Biomateriales, Universidad de La Habana, Ave Universidad. e/ G y Ronda, Vedado, Ciudad de La Habana, 10400, Cuba

²Grupo Nuevos Materiales y Espectroscopia Supramolecular, Facultad de Ciencia y Tecnología. 48080, Bilbao, España

Adv. Mater. Lett., 2013, Current Issue, 4 (7), pp 534-542

DOI: 10.5185/amlett.2012.10441

Publication Date (Web): May 01, 2013

Copyright © IAAM-VBRI Press

E-mail: issa.katime@ehu.es

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.

Keywords

Copolymer, monomer reactivity, microstructure parameters, furfuryl acrylate, HEMA.