Skip to main content Accessibility help

Spontaneous Formation of Nanopores and Nanorings in a PS-b-PEO Block Co-Polymer

  • Taiwo R. Alabi (a1), Dajun Yuan (a2) and Suman Das (a2)


PS-b-PEO block co-polymers have been reported to form cylindrical, lamellar, gyroidic, and supramolecular architectures due to several reasons: some of the reasons include the chemical incompatibility between the lipophilic and lipophobic covalently cross-linked blocks resulting in a high Flory-Huggins interaction parameter, the annealing solvent, and the interfacial boundary conditions between the substrate and the phase separating blocks. We report here for the first time on the spontaneous formation of nanopores and nanorings in PS-b-PEO block co-polymers. The mean size and depth of the pores are about 150nm and 40nm, respectively, while the pores occur randomly placed in clusters of about 2-5 pores. The pore clusters leave behind a breath-like architecture replicated by the phase separating block co-polymer. These breath architectures, in the shape of nanorings, are formed during the initial period of phase separation and do not disappear after phase separation has been achieved, leaving behind a PS-enriched circular framework. The diameter of the nanorings is in the 200-700nm range, as measured from AFM phase and height images. This range falls within the reported size of water droplets forming breath structures on polymer films. The resulting nanoarchitectured materials could find potential applications where biocompatibility and water permeability of the PEO block within the nanopores is desirable. In addition, the slightly elevated nanorings could also provide semi-enclosed barriers that can serve as micro/nano-enclosed cell and tissue cultures.



Hide All
1. Peinemann, K.-V., Abetz, V. and Simon, P. F. W., Nat Mater 6(12), 992996 (2007).
2. Lin, Z. Q., Kim, D. H., Wu, X. D., Boosahda, L., Stone, D., LaRose, L. and Russell, T. P., Advanced Materials 14(19), 13731376 (2002).
3. Kim, S. H., Misner, M. J., Yang, L., Gang, O., Ocko, B. M. and Russell, T. P., Macromolecules 39(24), 84738479 (2006).
4. Kim, S. H., Misner, M. J. and Russell, T. P., Advanced Materials 16(23-24), 21192123 (2004).
5. Sohn, B.-H., Seo, B.-W. and Yoo, S.-I., Journal of Materials Chemistry 12(6), 17301734 (2002).
6. Bates, F. S. and Fredrickson, G. H., Physics Today 52(2), 3238 (1999).
7. Bates, F. S., Science 251 (4996), 898905 (1991).
8. Leibler, L., Macromolecules 13(6), 16021617 (1980).
9. Cheng, C., Tian, Y., Shi, Y., Tang, R. and Xi, F., Macromolecular Rapid Communications 26(15), 12661272 (2005).
10. Bang, J., Kim, B. J., Stein, G. E., Russell, T. P., Li, X., Wang, J., Kramer, E. J. and Hawker, C. J., Macromolecules 40(19), 70197025 (2007).



Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed