文献类型：期刊文献

英文题名：Stimuli-responsive and micellar behaviors of star-shaped poly[2-(dimethylamino)ethyl methacrylate] -b-poly [2-(2-methoxyethoxy)ethyl methacrylate] with a β-cyclodextrin core

作者：Guo, Yi[1];Li, Meng[1];Li, Xinrui[1];Shang, Yazhuo[1];Liu, Honglai[1]

机构：[1]East China Univ Sci & Technol, Key Lab Adv Mat, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2017

卷号：116

起止页码：77

外文期刊名：REACTIVE & FUNCTIONAL POLYMERS

收录：;EI(收录号：20171803633134);WOS:【SCI-EXPANDED(收录号:WOS:000403519800010)】；

基金：This work is supported by the National Natural Science Foundation of China (Projects No. 21476072, 91334203) and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Star-shaped copolymer; beta-cyclodextrin; Thermo-sensitive; Micellar behavior

摘要：A series of star-shaped block copolymers (CDPDPM) of 2-(dimethylamino)ethyl methacrylate (DMAEMA) and 2-(2-methoxyethoxy)ethyl methacrylate (MEO(2)MA) with tunable stimuli-responsive behavior are synthesized via sequential atom transfer radical polymerization (ATRP) with the 2-bromoisobutyryl-terminated beta-cyclodextrin (beta-CD) as a core. The properties of these star-shaped copolymers are characterized by FT-IR, NMR and GPC analyses. Meanwhile, the thermo-sensitive behaviors of CDPDPM with different compositions and pH values are investigated by dynamic light scattering (DLS) and UV-vis measurements. The results have shown that the synthesized polymer CDPDPM exhibits both pH- and thermo-responsive behaviors in aqueous solutions. The star-shaped copolymers with the nearly equal mole fraction of DMAEMA and MEO(2)MA show two-step thermo-induced aggregation behavior in water at a pH near the isoelectric point (IEP), which corresponds to the formation of branch aggregates and large aggregates consisting of clustered branch aggregates, respectively. The mole fraction of DMAEMA and MEO(2)MA in polymer affects the thermal-responsive behaviors of polymer itself. Moreover, the micellar behaviors of the synthesized copolymers in aqueous solution are explored. The aggregation process of the copolymer can be generalized into intramolecular aggregation of the hydrophobic chains (corresponding to C-I), formation of premicelles, the aggregation and rearrangement of the premicelles (namely CMC), as well as the formation of multicore structures. The C-I and CMC values depend on both the MEO(2)MA molar fraction and the carbon backbone length of polymers. The aggregation number (N) and the sizes of polymer micelles (D-h) vary with the polymer composition, polymer concentration and ambient environment.