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	Synthesis and property of Y-shaped thermoresponsive block copolymers
	Tang, Xinde ; Liang, Xiaochao ; Han, Nianfeng
	2009
英文摘要	Novel Y-shaped amphiphilic block copolymers of poly(ethylene glycol) and poly(N-isopropylacrylamide), PEG-b-(PNIPAM)2, were successfully synthesized through atom transfer radical polymerization (ATRP). A difunctional macroinitiator was prepared by esterification of 2,2-dichloroacetyl chloride with poly(ethylene glycol) monomethyl ether (PEG). The copolymers were obtained via the ATRP of N-isopropylacrylamide (NIPAM) with CuCl/Me6TREN as catalyst and DMF/H2O (v/v = 3:1) mixture as solvent. The resulting polymers were characterized by gel permeation chromatography (GPC) and 1H NMR. These block copolymers show controllable molecular weights and narrow molecular weight distributions (PDI < 1.15). Their phase transition temperatures and enthalpy changes in aqueous solution were measured by differential scanning calorimetry (DSC). The results indicate a significant influence of the macromolecular architecture on the phase transition. This is the first study into the effect of molecular architecture on the phase transition using Y-shaped amphiphilic block copolymer composed of PEG and PNIPAM.; EI; 0
语种	英语
DOI标识	10.4028/www.scientific.net/AMR.79-82.1623
内容类型	其他
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/411250]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Tang, Xinde,Liang, Xiaochao,Han, Nianfeng. Synthesis and property of Y-shaped thermoresponsive block copolymers. 2009-01-01.

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