Akademik Veri Yönetim Sistemi
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, cilt.48, sa.24, ss.5842-5847, 2010 (SCI-Expanded)
The single electron transfer living radical polymerization (SET LRP) of N isopropylacrylamide (NIPAM) from sill con wafer modified with an initiator layer composed of 2 bromopropionyl bromide (2 BPB) fragments is described The amount of Cu(0) generated in situ by the disproportination of Cu(I) to Cu(0) and Cu(II) in the presence of 2 2 ' bipyridine (2 2 ' bpy) ligand and N N dimethylformarnide (DMF) solvent at 90 degrees C is dependent on the ratio of ICuBrI/[CuBr2] By proper selection of the [CuBr]/[CuBr2] ratio well controlled SET-LRP polymerization of NIPAM was observed such that the thickness of the layer consisting of chains grown from the surface increased linearly with the molecular weight of chains polymenzed in solution in identical In addition the calculation grafting parameters including surface coverage sigma (mg/m(2)) grafting density Sigma (chain/nm(2)) and average distance between grafting sites D (nm) from the number average molecular weight (M) over bar (n) (g/mol) and ellipsometric thickness h (nm) values indicated the synthesis of densely grafted poly(NIPAM) films and allowed us to predict a brush like conformation (c) 2010 Wiley Periodicals Inc J Polym Sci Part A Polym Chem 48 5842-5847 2010