期刊
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
卷 47, 期 11, 页码 2905-2916出版社
WILEY
DOI: 10.1002/pola.23371
关键词
amphiphiles; atom transfer radical polymerization (ATRP); click chemistry; micelles; poly(acrylic acid); poly(epsilon-caprolactone); poly(tert-butyl acrylate); resorcinarene; ring-opening polymerization (ROP); self-assembly; star-block copolymer; star polymers
资金
- National Natural Science Foundation of China [20704036, 20434020]
- Major State Basic Research Project [2005CB623802]
- Committee of Science and Technology of Zhejiang Province
Novel amphiphilic eight-arm star triblock copolymers, star poly(P.-caprolactone)-block-poly(acrylic acid)-block-poly(epsilon-caprolactone)s (SPCL-PAA-PCL) with resorcinarene as core moiety were prepared by combination of ROP, ATRP, and click reaction strategy. First, the hydroxyl end groups of the predefined eight-arm SPCLs synthesized by ROP were converted to 2-bromoesters which permitted ATRP of tert-butyl acrylate (tBA) to form star diblock copolymers: SPCL-PtBA. Next, the bromide end groups of SPCL-PtBA were quantitatively converted to terminal azides by NaN3, which were combined with presynthesized alkyne-terminated poly(epsilon-caprolactone) (A-PCL) in the presence of Cu(I)/N,N,N',N '',N ''-pentamethyldiethylenetriamine in DMF to give the star triblock copolymers: SPCL-PtBA-PCL. H-1 NMR, FTIR, and SEC analyses confirmed the expected star triblock architecture. The hydrolysis of tert-butyl ester groups of the poly(tert-butyl acrylate) blocks gave the amphiphilic star triblock copolymers: SPCL-PAA-PCL. These amphiphilic star triblock copolymers could self-assemble into spherical micelles in aqueous solution with the particle size ranging from 20 to 60 nm. Their micellization behaviors were characterized by dynamic light scattering and transmission electron microscopy. (c) 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 2905-2916, 2009
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