Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session A35: Directed Self-Assembly of Copolymers in Confined Geometry I
8:00 AM–11:00 AM,
Monday, March 2, 2020
Sponsoring Unit: DPOLY
Chair: Sveta Morozova
Abstract: A35.00005 : Hexagonal pattern coarsening in cylinder-forming PS-b-PMMA block copolymer thin films*
The weakly dependence on T of χS-MMA allows decoupling the control of χN by means of N, and that of the thermally activated kinetic barriers for ordering kinetics modulating T, evidencing the order-disorder transition (ODT) and glass transition (GT) involved in BCP ordering.
Thermodynamically, weak and strong segregation limits are not distinguishable. In weak segregation limit the ordering process switches from a diffusion limited to a curvature driven mechanism. Both single chain and collective motions comply with the extensively evidenced kinetic limited coarsening and the reduced diffusivity, increasing N and moving away from ODT, and with the thermodynamic limited coarsening and the enhanced diffusivity, decreasing N and moving towards ODT.
The collective dynamic is further investigated discriminating the behavior of the penta-hepta defects within the hexagonal pattern to give a comprehensive description of thermodynamic, kinetic and topological characteristics of the hexagonal pattern coarsening.
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