Phase segregation of diblock copolymers in nanopore geometriesP. Maniadis1, I. N. Tsimpanogiannis2, E. M. Kober1 and T. Lookman1
1 Los Alamos National Laboratory - Los Alamos, NM, 87545, USA
2 Environmental Research Laboratory, National Center for Scientific Research "Demokritos" Ag. Paraskevi, Athens, 15310, Greece
received 12 September 2007; accepted in final form 3 January 2008; published March 2008
published online 4 February 2008
The self-assembly of a diblock copolymer melt in a confined regular geometry with a given pore size is studied using self-consistent field theory. For a particle in a polymer domain, we obtain the interaction potential as a function of the distance from the polymer interface. For a given concentration of particles of a certain size and separation, we find that microphase segregation is sensitive to the characteristic length scales of the geometry. In particular, novel polymer morphologies arise when the size of the pores and the distance between them are comparable to the diblock polymer radius of gyration Rg. Confinement can result in morphologies not allowed in the bulk. However, if the pore size is much larger than Rg, the effects are then limited to the vicinity of the pore surface.
64.75.Va - Phase separation and segregation in polymer blends/polymeric solutions.
61.43.Gt - Powders, porous materials.
64.75.Jk - Phase separation and segregation in nanoscale systems.
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