Acta Chimica Sinica ›› 2013, Vol. 71 ›› Issue (05): 733-738.DOI: 10.6023/A13010117 Previous Articles     Next Articles



潘高翔, 冯泽, 韦嘉, 俞燕蕾   

  1. 复旦大学材料科学系 聚合物分子工程国家重点实验室 上海 200433
  • 投稿日期:2013-01-23 发布日期:2013-03-08
  • 通讯作者: 俞燕蕾,
  • 基金资助:

    项目受国家自然科学基金(Nos. 21134003, 21273048, 51225304, 51203023)、高等学校博士学科点专项科研基金(No. 20100071110014)、上海市青年科技启明星跟踪计划(No. 11QH1400400)资助.

Synthesis and Self-assembly Behavior of a Thermo-/photo-dual Responsive Triblock Copolymer

Pan Gaoxiang, Feng Ze, Wei Jia, Yu Yanlei   

  1. Department of Materials Science, State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai 200433
  • Received:2013-01-23 Published:2013-03-08
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Nos. 21134003, 21273048, 51225304, 51203023), Specialized Research Fund for the Doctoral Program of Higher Education (20100071110014), Shanghai Rising-Star (follow-up-supported) Program (11QH1400400).

A novel triblock copolymer containing azobenzene (AZO) and N-isopropylacrylamide (NIPAM) was synthesized by atom transfer radical polymerization (ATRP) using a poly(ethylene oxide) bifunctional macroinitiator (Br-PEO-Br). The triblock copolymer was characterized by 1H NMR and gel permeation chromatography (GPC). Uniformly distributed polymeric micelles were obtained in aqueous solution by self-assembly method. Transmission electron microscope (TEM), fluorescence spectroscopy and dynamic light scattering (DLS) were used for the investigation of the self-assemblies and their stimuli-responsive behavior. Photoinduced release behavior was achieved with the as-prepared triblock copolymer micelles, which has not been observed in our previously-reported diblock copolymer micelles: the fluorescence intensity of Nile Red trapped in the triblock copolymer micelles dropped by approximately 40% after UV and Vis light alternative irradiation, indicating that a portion of the Nile Red was released to the aqueous media. Besides, the micelles shrank during the heating process.

Key words: ATRP, block copolymers, self assembly, photo-response, thermo-response