期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 393, 期 -, 页码 174-181出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2012.10.051
关键词
Amphiphilic; Block copolymer; Self-assembly; Solubilizing ability
资金
- National Natural Science Foundation of China (NSFC) [51103179]
- Natural Science Foundation of Shandong Province, China [ZR2011BL017]
- Fundamental Research Funds for the Central Universities [27R0904082A, 27R1004053A]
Amphiphilic triblock copolymers of PEO-PPO-PCL with various block compositions have been synthesized by ring-opening polymerization (ROP) of epsilon-caprolactone (epsilon-CL) initiated by the OH group of methoxy poly(ethylene oxide) poly(propylene oxide) (Me PEO PPO). Their structures were confirmed by Fourier transform infrared (FT-IR) measurements, and their self-assembly in aqueous solution was studied using fluorescence spectroscopy, transmission electron microscopy (TEM), UV-vis spectra, differential scanning calorimetry (DSC), and surface tension. For the copolymers studied in this paper, the critical aggregation concentrations (CAC) ranged from 5 x 10(3) to 2 mg/L. The critical micelle concentrations (CMC) decreased with increasing PCL block length, and the downtrend was more significant in the short PCL block length. All of the three copolymers were capable of solubilizing hydrophobic molecules (pyrene) in aqueous solution and copolymers with a longer PCL block exhibited a stronger solubilizing ability. The TEM images showed that the size and morphology of the aggregations could be tuned by varying the compositions or the concentration. (C) 2012 Elsevier Inc. All rights reserved.
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