A triblock copolymer containing cyclic midblock: synthesis and characterization
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초록
내용
Over the decade’s intensive research on cyclic polymers have been conducted due to their unique properties like lower intrinsic viscosity, lower hydrodynamic volume, and higher Tg in comparison to their linear analogues. In this study, a new class of triblock copolymer consisting of linear and cyclic polymers was prepared via ATRP. A midblock of polystyrene (PS) was synthesized using a tetra-functional initiator, followed by azidation to yield azide end-functionalized star polymers. CuAAC click reaction using a hydroxy functionalized diyne coupling agent enabled the construction of dihydroxy cyclic PS (cPS) after the purification using preparative size exclusion chromatography and HPLC. A subsequent esterification using α-bromoisobutyryl bromide of cPS yielded a cPS macroinitiator of ATRP, followed by ATRP of MMA yielded a triblock copolymer. A glasses-shaped triblock copolymer of PMMA-b-cPS-b-PMMA was successfully synthesized and characterized using SEC, 1H NMR, and FT-IR.