Synthesis and characterization of comb type copolymer from methylmethacrylate macromonomer

In this study, first, methylmethacrylate macromonomer and macroinitiator based ?-caprolacton (?-CL) were synthesized. For this purpose, homopolymerization of methylmethacrylate was prepared by ATRP method by using 4-chloro methyl-7-hydroxy coumarin as a initiator. Methylmethacrylate macromonomer was synthesized from acylation reaction of methacryloyl chloride with 7-hydroxy coumarin ended PMMA. The macroinitiator was prepared from reaction of chlorine acetylchloride P(?-CL) synthesized by ring opening polymerization of ?-caprolactone. Also, the comb type copolymers containing macromonomer synthesized by free radical polymerization of benzylmethacrylate (BMA) and acrylonitrile (AN). The FT-IR, 1H and 13C-NMR techniques for structural characterization were used mainly. The thermal behavior of comb type copolymers was measured by DSC and TGA in comparison with each other. The average molecular weights and the polydispersities of polymers were measured by GPC techniques. The monomer reactivity ratios for comb type copolymer systems synthesized by using free radicalic copolymerization method were determined by using Kelen-Tüdös method Kelen-Tüdös, Fineman-Ross. The polymer amine ended prepared from modification of the macromonomer chlorine ended with diethanol amine was investigated properties dye with bromine cresol green. The viscosity measurements of comb-type copolymers were carried out by using Ubbelohde viscosimeter. The activation energy for thermal degradation of comb type copolymers was calculated according to the method of Flynn-Wall-Ozawa by using decomposition curves in different heating rations. The dielectric behaviors of comb-type copolymers were measured with impedance analyzer. Dielectric permittivity (??), dielectric loss factor (???), AC-electric conductivity (?), susceptance (Bp) and empedance (IZI) values of comb-type copolymers were investigated as a function of temperature and frequency. Beside, their effects on the electrical properties by doping with EuCl3 for some of the comb copolymers were, and were investigated. Key Words: Macromonomer, comb-type copolymer, ?-Caprolactone, ATRP, AC-electric conductivity, electrical properties, dopped, EuCl3