Atom Transfer Radikal Polimerizasyonu Yoluyla n-bütilmetakrilatın İki Kollu Aşı Kopolimerlerinin Sentezi ve Karakterizasyonu.

In this study, poli{styrene-co-[3,5-bis(2-chloro-2-acetoxyphenyl)metakrilat]}, poly(St-co-CAPMA%4) twoarmed macroinitiator was prepared from free radical copolymerization of styrene with 3,5-bis(2-chloro-2- acetoxyphenyl)methacrylate in presence of AIBN at 60oC in 1,4-dioxane . A series of two armed grafting studies with n-buthylmethacrylate was carried out in the presence of the poly(St-co-CAPMA%4) as macroinitiator (Mn = 23300 and Mw/Mn = 1.67) and CuBr/2,2′-bipyridyne(bpy) as catalyst at 110 °C in diphenyl ether. All the polymers were structurally characterized by FTIR and 1H-NMR spectra. During the 20 h grafting reaction, the number-average molecular weight of the macroinitiator increased from 23300 to 135900 and the polydispersity decreased from 1.67 to 1.40. All the graft copolymers, which had initial decomposition temperatures (Ti) between 262 ve 222 °C were less thermally stable than macroinitiator (Ti : 305 °C) . The graft copolymers (132- 136°C) showed a higher glass-transition temperature than the macroinitiator (112°C). The dielectric constants (ϵ′) of macroinitiator and graft copolymers were measured at different frequence at room temperature. [ABSTRACT FROM AUTHOR]