From NSDL Materials Digital Library Wiki
Block Copolymers (BCPs) and surfactants are known to phase separate into complex morphologies including Cubically Ordered Spherical Micelles, Hexagonally Packed Cylindrical Micelles, Double Gyroid, Perforated Lamella, and Lamella. Recent simulation results have shown that Tethered building blocks also can exhibit similar phases as a result of microphase separation.
Melts of BCPs, with block fractions of ~0.35-0.65 have been shown to form cylindrical micelles that order into hexagonal arrangements . Here block fraction is defined as (length of the A block)/(total length of polymer).
- An example using Brownian Dynamics showing the final morphology of a phase separated block copolymer into lamella:
- Specifically, for Fv=1, at volume fractions ~0.4-0.55, tether-aggregating tethered nanospheres yielded lamella bilayers .
- Head-aggregating tethered nanospheres (TNS) with Fv =1, were found to exhibit lamella behavior at volume fractions ~0.35-0.5.