Synthesis and Property of Y-Shaped Thermoresponsive Block Copolymers

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.

关键词： Y-shaped thermoresponsive block copolymer lower critical solution temperature

作者: Xinde Tang Xiaochao Liang Nianfeng Han

作者单位: Institute of New Materials, Shandong Jiaotong University, Ji’nan 250023, China College of Chemistry College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, Chinal Institute of New Materials, Shandong Jiaotong University, Ji’nan 250023, China

会议类型: 国际会议

会议名称: 第二届多功能材料与结构国际会议

会议地点: 青岛

会议语种:英文

页码: 1623-1626

在线出版日期: 2009-10-09（万方平台首次上网日期，不代表论文的发表时间）