Publications


Title : Structural Changes in Block Copolymer Solutions under Shear Flow as Determined by Non-Equilibrium Molecular Dynamics

Language: English
Type: Article
Authors: Igor Rychkov and Kenichi Yoshikawa
Journal: Macromolecular Theory and Simulations
ISSN: 1022-1344
Volume: 13
Number: 3
Month: 4
Year: 2004
Actual year: 2004
Pages: 257-264
doi:   10.1002/mats.200300018
Abstract: A non-equilibrium molecular dynamics computer simulation on microsegregated solutions of symmetrical diblock copolymers is reported. As the polymer concentration increases, the system undergoes phase transitions in the following order: body centered cubic (BCC) micelles, hexagonal (HEX) cylinders, gyroid (GYR) bicontinuous networks and lamellae (L), which are the same morphology reported for block copolymer melts. Structural classification is based on the patterns of the anisotropic static structure factor and characteristic 3-dimensional images. The systems in the BCC micellar (rhosigma(3) = 0.3) and HEX cylindrical (rhosigma(3) = 0.4) phases were then subjected to a steady planar shear flow. In weak shear flow, the segregated domains in both systems tend to rearrange into sliding parallel close-packed layers with their normal in the direction of the shear gradient. At higher shear rates, both systems adopt a perpendicular lamellar structure with the normal along the neutral direction. A further increase in the shear rate results in a decrease in lamellar spacing without any further structural transitions. Two critical shed rate values that correspond to the demarcation of different structural behaviors were found.

"Structural Changes in Block Copolymer Solutions under Shear Flow as Determined by Non-Equilibrium Molecular Dynamics"

Igor Rychkov and Kenichi Yoshikawa, Macromolecular Theory and Simulations, 13, 257-264 (2004)