Citation: Chun-yan Wang, Qian Yuan, Shu-guang Yang, Jian Xu. Effect of Water Content on the Size and Membrane Thickness of Polystyrene-block-Poly(ethylene oxide) Vesicles[J]. Chinese Journal of Polymer Science, ;2015, 33(4): 661-668. doi: 10.1007/s10118-015-1618-y shu

Effect of Water Content on the Size and Membrane Thickness of Polystyrene-block-Poly(ethylene oxide) Vesicles

Received Date: 18 August 2014
Revised Date: 12 September 2014

Fund Project: This work was financially supported by the National Natural Science Foundation of China (No. 51103022), Science and Technology Commission of Shanghai Municipality (STCSM, Pujiang Talent Plan, No. 12PJ1400100), Innovation Program of Shanghai Municipal Education Commission, Fundamental Research Funds for the Central University and DHU Distinguished Young Professor Program and Chinese Universities Scientific Fund (No. CUSF-DH-D-2013004).

The asymmetric amphiphilic block copolymer polystyrene962-block-poly(ethylene oxide)227 (PS962-b-PEO227) canforms micelles with N, N-dimethylformamide (DMF) as co-solvent and water as selected solvent, and when the water content of the mixed solvent is higher than 4.5 wt%, the vesicle will be dominated. This work finds that once vesicles are formed in the DMF-water mixed solvent, the vesicle size and membrane thickness can be tuned by further increasing water content. As the water fraction elevated from 4.8 wt% to 13.0 wt%, the vesicle size dercreases from 246 nm to 150 nm, while the membrane thickness increases from 28 nm to 42 nm. In addition, the block copolymer packing and the free energy are analyzed as the vesicle size becomes small and the membrane becomes thick.
- Vesicles,
- Micelle,
- Block copolymer,
- Polymersomes
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