Compositional and orientational ordering in rod-coil diblock copolymer melts

Details Compositional and orientational ordering in rod-coil diblock copolymer melts Compositional and orientational ordering in rod-coil diblock copolymer melts

2001-10-08

arxiv.org/abs/cond-mat/0110143v3

Macromolecules 35 (2002) 3266-3280

Physics

Condensed Matter

Soft Condensed Matter

33pp. 8 figs (REVTeX). Typos in Eqs.(10), (28), and (B.36)-(B.39) corrected

Scientific paper

10.1021/ma011777v

The phase behavior of a melt of monodisperse rod-coil diblocks is studied. We derive a Landau free energy functional for both a compositional and a nematic order parameter. The excluded volume interaction between the rod blocks is modeled by an attractive Maier-Saupe interaction. The incompatibility between rod- and coil blocks is modeled by the usual Flory-Huggins interaction. For a large volume fraction of the rods, a transition from isotropic to nematic to smectic C is observed upon decreasing the temperature, whereas for small rod volume fraction, spherical, hexagonal, and lamellar structures prevail. In the smectic C phase, the rod orientation angle with respect to the lamellar normal increases rapidly from 35 to 40 degrees close to the nematic/smectic-C phase boundary to values between 45 and 55 degrees.

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