Reactive & Functional Polymers, Vol.68, No.9, 1384-1391, 2008
Synthesis and characterization of functional gradient copolymers of glycidyl methacrylate and butyl acrylate
Epoxy-functional spontaneous gradient copolymers of glycidyl methacrylate (G) and n-butyl acrylate (13) were synthesized via atom transfer radical polymerization (ATRP). The copolymerization reactions were carried out in toluene solution at 70 degrees C, using methyl 2-bromopropionate (MBrP) as initiator and copper chloride with N,N,N ',N '' N ''-pentamethyldiethylenetriamine (PMDETA) as the catalyst system. The kinetic behaviour of the statistical copolymerizations was studied in a wide composition interval with molar fractions of G ranging from 0.10 to 0.75. The synthesized copolymers were characterized by size exclusion chromatography (SEC) and nuclear magnetic resonance (NMR) spectroscopy. H-1 NMR was employed to determine the copolymer composition, demonstrating the gradient character of the copolymers along the main chain in the whole monomer conversion interval. Apart from this, the sequence distribution and stereoregularity were analyzed. These microstructural experimental data agreed well with those calculated from Mayo-Lewis terminal model (MLTM) and a Bernoullian statistic with an isotacticity parameter of sigma(C) = 0.28 and a coisotacticity parameter of sigma = 0.30. (C) 2008 Elsevier Ltd. All rights reserved.
Keywords:atom transfer radical polymerization (ATRP);glycidyl methacrylate;n-butyl acrylate;gradient copolymers;microstructure