AB2-type amphiphilic block copolymers composed of poly(ethylene glycol) and poly(N-isopropylacrylamide) via single-electron transfer living radical polymerization: Synthesis and characterization
作者： Xinde Tang , Xiaochao Liang , Qian Yang , Xinghe Fan , Zhihao Shen
DOI: 10.1002/POLA.23495
关键词:
摘要: Novel AB 2 -type amphiphilic block copolymers of poly(ethylene glycol) and poly(N-isopropylacrylamide), PEG-b-(PNIPAM) , were successfully synthesized through single-electron transfer living radical polymerization (SET-LRP). A difunctional macroinitiator was prepared by esterification 2,2-dichloroacetyl chloride with monomethyl ether (PEG). The obtained via the SET-LRP N-isopropylacrylamide (NIPAM) CuC1/tris(2-(dimethylamino)ethyl)amine (Me 6 TREN) as catalytic system DMF/H O (v/v = 3:1) mixture solvent. resulting characterized gel permeation chromatography 1 H NMR. These show controllable molecular weights narrow weight distributions (PDI < 1.15). Their phase transition temperatures corresponding enthalpy changes in aqueous solution measured differential scanning calorimetry. As a result, temperature PEG 44 -b-(PNIPAM 55 ) is similar to that case -b-PNIPAM 110 ; however, change much lower, indicating significant influence macromolecular architecture on transition. This first study into effect using copolymer composed PNIPAM.
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