Multiple morphologies of self-assembled star aggregates of amphiphilic PEO-b-PNPMA diblock copolymers in solution, synthesis and micellization

作者：Tang Xuezhi; Hu Yongehen; Pan Caiyuan^*

来源：Polymer, 2007, 48(21): 6354-6365.

DOI：10.1016/j.polymer.2007.08.030

• amphiphilic block copolymer micelles
• multiple morphologies
• self-assembly

Novel amphiphilic block copolymers, poly(ethylene oxide)-b-poly(p-nitrophenyl methacrylate) (PEO-b-PNPMA) with controlled molecular weights and narrow molecular weight distribution were successively synthesized by ATRP of NPMA using PEO-Br as initiator. Self-assembling Of the diblock copolymer PEO113-b-PNPMA(28) in the different solvent mixtures yielded various morphologies of star micelle-like aggregates, such as spheres. vesicles. cauliflower-like aggregates and rod-like aggregates, which are determined by the nature of the common solvents and the selective solvents. Thus the critical selective solvent contents and the solvent contents in PNPMA-rich phase were measured, and they have the following order: ethanol > methanol > water, and THF > CH3NO2 > DMSO. The probable self-assembling mechanism is discussed. This method is convenient for preparation of multiple morphological star micelle-like aggregates in solution, especially from the amphiphilic block copolymers with relatively longer block shell.

• 出版日期2007-10-5
• 单位中国科学技术大学