Journal
POLYMER
Volume 54, Issue 14, Pages 3709-3715Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2013.04.058
Keywords
Micelle; Vesicle; Morphology transformation
Categories
Funding
- National Natural Science Foundation of China (NSFC) [51103022, 50925312]
- Science and Technology Commission of Shanghai Municipality (STCSM, Pujiang Talent Plan) [12PJ1400100]
- Fundamental Research Funds for the Central Universities
- Chinese Universities Scientific Fund [CUSF-DH-D-2013004]
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Morphology transformation of polystyrene-block-poly(ethylene oxide) (PS-b-PEO) vesicle on solid surface induced by vapor annealing was investigated. The PS-b-PEO diblock copolymer vesicles, prepared by dissolving in a co-solvent and adding a selective solvent, were transferred to silicon wafer surface by spin cast and then incubated in three different vapors, tetrahydrofuran (THF), dioxane (DIOX), and N, N-dimethylformamide (DMF) separately. In THF or DIOX, the vesicular structures quickly fuse together into a droplet which then spreads on the surface. While in DMF vapor, vesicle-cylinder-sphere transformation is present. The vesicle morphology transformation in DMF vapor is very sensitive to water content. A small amount of water in DMF would slow down the transformation rate, and water content would affect the cylinder packing. (C) 2013 Elsevier Ltd. All rights reserved.
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