Synthesis and characterization of gradient copolymers via in situ transesterification of MA with alcohols in tandem living radical polymerization
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초록
내용
Gradient copolymers are unique class of copolymer in which the monomer composition changes gradually from one end of the polymer chain to the other. Thus, we focus on the method of synthesis of gradient copolymers using the transesterification techniques. The Mt(acac)x was introduced as tandem catalyst for transesterification and ruthenium-catalyzed living radical polymerization (LRP) to efficiently, conveniently, and in one-pot produce via in situ monomer transformation. Here, a methylacrylate (MA) is selectively transesterified with various alcohols (ROH). The kinetic balance of transesterification and LRP was controlled by the different concentration of the Mt(acac)x and various alcohols, which were confirmed by 1H NMR, SEC, and DSC.