Orientation transition of defective lyotropic triblock copolymer lamellar phase
نویسندگان
چکیده
منابع مشابه
Triblock Copolymer Theory: Ordered ABC Lamellar Phase
The ABC lamellar phase of a triblock copolymer in the strong segregation region is studied on periodic and bounded intervals. In the periodic case we find a family of local minimizers of the free energy functional all with a fine lamellar structure. Among these local minimizers we identify the one most favored by the free energy, and hence determine the thickness of lamellar microdomains. In th...
متن کاملSupplemental Information for Dynamic orientation transition of lyotropic lamellar phase at high shear rate
Typical SAXS profiles and lamellar spacing d as a function of shear rate for the system with B/H=0.30 at T=25◦C are shown in fig. 1. This systems shows the orientation transition at γ̇c/a=300s −1 (see Fig. 6 in the main text). Lamellar spacing d at B/H=0.30 slightly decreases with increase in the shear rate, while at B/H=0.32 it slightly reduces at low shear rate and stays almost constant at hig...
متن کاملDynamic orientation transition of the lyotropic lamellar phase at high shear rates.
The dynamic orientation behavior of the lamellar phase of a triblock copolymer is studied in a wide range of shear rates as a function of solvent composition. We find that various phases can be induced by increasing the shear rate. At low shear rates, the onion phase forms from planar lamellae with many defects. A further increase of the shear rate caused the onion structure to break down, and ...
متن کاملKinetics of phase transition from lamellar to hexagonally packed cylinders for a triblock copolymer in a selective solvent
We examined the kinetics of the transformation from the lamellar (LAM) to the hexagonally packed cylinder (HEX) phase for the triblock copolymer, polystyrene-b-poly (ethylene-co-butylene)-b-polystyrene (SEBS) in dibutyl phthalate (DBP), a selective solvent for polystyrene (PS), using time-resolved small angle x-ray scattering (SAXS). We observe the HEX phase with the EB block in the cores at a ...
متن کاملOn the orientation of lamellar block copolymer phases under shear.
Self-assembled lamellar structures composed of block copolymers are simulated by molecular dynamics. The response of a bulk system to external shear is investigated, in particular, the average energy, the entropy production, and the stability of the lamellae's orientation. We distinguish two orientations, a parallel orientation in which the normal to the lamellae sheets lies in the direction of...
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ژورنال
عنوان ژورنال: Journal of Biorheology
سال: 2014
ISSN: 1867-0466,1867-0474
DOI: 10.17106/jbr.28.55