Abstract
The effect of shear on crystalline order is interesting fundamentally, as well as technologically, for producing long-range alignment of micron- and nanoscale structures. We study the influence of shear on a sphere-forming diblock copolymer thin film consisting of a stack of two to six hexagonal layers, using a stress-controlled rheometer to transmit the stress through a viscous fluid layer. Above a threshold stress, the hexagonal layers align macroscopically in the “easy shearâ direction. A simple phenomenological model with an orientation-dependent order-disorder temperature, TODT* = TODT [1a (I• Ic) sin2 (3II)] and recrystallization describes the influence of stress level, temperature, and shearing time remarkably well.
Original language | English (US) |
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Article number | 040801 |
Journal | Physical Review E - Statistical, Nonlinear, and Soft Matter Physics |
Volume | 74 |
Issue number | 4 |
DOIs | |
State | Published - 2006 |
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Statistical and Nonlinear Physics
- Statistics and Probability