Raft Polimerizasyon Yöntemi İle Akrilik Alkid Blok Kopolimer Sentezi ve Karakterizasyonu

Abstract

This thesis work describes the recent advances in the synthesis of acrylic-alkyd hybrid materials using Reversible Addition-Fragmentation Chain Transfer (RAFT) polymerization which is one of the most powerful tools of Controlled Radical Polymerization (CRP) techniques. Until now, the synthesis of acrylic-alkyd hybrid materials has only been reported using conventional free radical chemistry. However, as with all free radical processes, control of graft location and graft efficiency is difficult between these materials. The aim of this work was to produce acrylic-alkyd-acrylic block copolymers by modifying medium oil hydroxyl-functional alkyds with a carboxyl-functional RAFT agent through RAFT polymerization. Macro-RAFT agent was produced by first synthesizing the alkyds, followed by esterification of the free hydroxyl groups with the carboxyl-functionality of S-1-Dodecyl S’-( , ’-dimethyl- ”-acetic acid) trithiocarbonate using the N,N-1-Dicyclohexyl carbodiimide (DCC)/ 4-Dimethylaminopyridine (DMAP) reaction process. The alkyd-macro initiators were then used as the RAFT chain transfer agent in the controlled polymerization of specific acrylic monomers including butyl acrylate (BA) and ethyl methacrylate (EMA). These acrylic-alkyd hybrid materials were subsequently characterized by 1H NMR, 13C NMR, Gel Permeation Chromatography (GPC), and Fourier-Transform Infrared Spectroscopy (FTIR).