Synthesis and Micellization Properties of Double Hydrophilic A2BA2 and A4BA4 Non-Linear Block Copolymers
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- 作者：Jian Xu ; Zhishen Ge ; Zhiyuan Zhu ; Shizhong Luo ; Hewen Liu ; Shiyong Liu
- 刊名：Macromolecules
- 出版年：2006
- 出版时间：November 14, 2006
- 年：2006
- 卷：39
- 期：23
- 页码：8178 - 8185
- 全文大小：252K
- 年卷期：v.39,no.23(November 14, 2006)
- ISSN：1520-5835
文摘
We describe the first account of the synthesis and intriguing micellization properties of nonlineardouble hydrophilic block copolymers (DHBCs) of the A2BA2 and A4BA4 type. Atom transfer radical polymerization(ATRP) macroinitiators with two and four initiating sites at both ends of poly(propylene oxide) (PPO) chainwere synthesized via reacting 2-hydroxyethyl acrylate and glycidol with commercially available diamine-terminatedPPO, respectively, followed by esterification with excess 2-bromoisobutyryl bromide or 2-bromopropionyl bromide.Well-defined nonlinear DHBCs, (PDEA)2PPO(PDEA)2 (H-shaped) and (PDEA)4PPO(PDEA)4 (star-b-linear-b-star), were then prepared by polymerizing 2-(diethylamino)ethyl methacrylate (DEA) via ATRP in 2-propanol at40 
C using the prepared macroinitiators, where PDEA was poly(2-(diethylamino)ethyl methacrylate). The structuresof the resulting nonlinear shaped copolymers were characterized by 1H NMR and gel permeation chromatography(GPC). The pH- and thermoresponsive micellization behavior of (PDEA10)2PPO(PDEA10)2 and (PDEA11)4PPO(PDEA11)4 was then investigated by a combination of dynamic laser light scattering (LLS) and fluorescencetechniques. Compared to the linear counterpart, the nonlinear block copolymers exhibited complex and interestingmicellization properties.
C using the prepared macroinitiators, where PDEA was poly(2-(diethylamino)ethyl methacrylate). The structuresof the resulting nonlinear shaped copolymers were characterized by 1H NMR and gel permeation chromatography(GPC). The pH- and thermoresponsive micellization behavior of (PDEA10)2PPO(PDEA10)2 and (PDEA11)4PPO(PDEA11)4 was then investigated by a combination of dynamic laser light scattering (LLS) and fluorescencetechniques. Compared to the linear counterpart, the nonlinear block copolymers exhibited complex and interestingmicellization properties.