Copolymers of Phenoxyethyl Methacrylate with Glycidyl Methacrylate: Synthesis, Characterization and Reactivity Ratios

Abstract

The free radical copolymerization of phenoxyethyl methacrylate (POEMA) and glycidyl methacrylate (GMA) was carried out using α,α′-azobisisobutyronitrile (AIBN) in 2-butanone solution at 333 ± 1 K. The copolymers were characterized by FTIR, ¹H-NMR and ¹³C-NMR spectroscopic methods. Thermal properties of the copolymers were also studied by thermogravimetric analysis (TGA). The compositions of the copolymers were established by ¹H-NMR analysis. The monomer reactivity ratios were computed using the Fineman–Ross (F-R) and Kelen–Tüdos (K-T) methods. These parameters were also estimated using a nonlinear computational fitting procedure, known as reactivity ratios error in variable model (RREVM). The mean sequence lengths determination indicates that the copolymers obtained are random in nature. Differences in the reactivity ratios obtained by the classical methods and RREVM were observed. GMA is more reactive than POEMA and although the copolymers are random, some tendency to GMA small block formation is reported.

Keywords:

• copolymers
• FT-IR
• glycidyl methacrylate
• nonlinear fitting
• phenoxyethyl methacrylate
• reactivity ratios
• thermogravimetry

K. Anver Basha (KAB) thanks the University Grants Commission (UGC) for granting him the Faculty Improvement Programme (FIP). L. A. gives thanks to 3040056 for a postdoctoral project. D. R. and L. G. express their thanks to Fondecyt, projects 1050962 and 1050956 for partial financial help.

Notes

^a G = Fr₁ − r₂, , where F₁ F_h are the lowest and highest values of F respectively.