Chemical Research in Chinese Universities

, Volume 29, Issue 1, pp 171–176

Dissipative particle dynamics simulation of onion phase in star-block copolymer


DOI: 10.1007/s40242-013-2042-x

Cite this article as:
Wu, S. & Du, T. Chem. Res. Chin. Univ. (2013) 29: 171. doi:10.1007/s40242-013-2042-x


A dissipative particle dynamics simulation technique was used to investigate the effect of molecular architecture of star-block copolymer on the patterned structure in a nanodroplet. With increasing the ratio of solvophilic to block length to solvophobic block length(RH/T), solvophobic sphere, ordered hexagonal phase, onion phase, perforated onion phase and flocculent phase are formed, respectively. Since onion phase has potential application in controlled drug release, it has received wide attention experimentally and theoretically. Our simulation indicates onion phase forms at a certain RH/T(close to but less than 1). A star-block copolymer molecule has two conformations in onion phase: either fully located in a shell or shared by two neighboring shells. Central structure affects onion’s final shape. The molecular number of the copolymer in each shell is a quadratic function of the shell’s radius. The arm number of star-block copolymer has little influence on onion’s structure, but slightly affects the solvent content. Additionally, we studied the influence of arm length on onion’s structure.


Star-block copolymerDissipative particle dynamicsOnion phase

Copyright information

© Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH 2012

Authors and Affiliations

  1. 1.College of Chemistry and Materials SciencesSichuan Normal UniversityChengduP. R. China