Lamellae alignment

Fig. 13 Effect of an electric field on the lamellar distance of a block copolymer solution, (a) 2D scattering pattern of a 50 wt% solution of SI51 dissolved in THF for different electric field strengths, (b) Dependence of the lamellar distance d of parallel (filled circles) and perpendicular (open circles) aligned lamellae, with respect to the electric field lines, on the electric field strength for the same solution, (c) Proposed chain stretching effect for lamellae aligned parallel to the field lines. Adapted with permission from Nature Materials [57]. Copyright (2008) Nature Publishing Group...

Fig. 3 Epitaxial growth of high-density polyethylene on oriented polypropylene. Polyethylene lamellae aligns at a 40° angle with the direction of orientation of the polypropylene. The orientation direction of polypropylene in the micrograph is along the horizontal. (From Ref...

Fig. 5.13 When confined to a thin fihn, the orientation of block copolymer domains with respect to the substrate surface is crucial for many applications, (a) Lamellae lying parallel to the substrate, (b) lamellae aligned perpendicular, (c) cylinders lying parallel, (d) cylinders perpendicular, and (e) spheres. In the case of lamellae in the perpendicular orientation and cylinders in parallel, lines can be patterned if the persistence length of the structure can be controlled. In the case of upright cylinders and spheres, the grain size and perfection of the hexagonal array is of primary importance. Reproduced with permission from ref. [105]...

SIMS is extremely sensitive, even to the part per billion range, and is used widely in the semiconductor industry. SIMS and XPS are complementary since they provide very similar information [203], but the depth resolution of static SIMS is substantially higher than XPS. However, the quantitative use of SIMS in polymer science is currently not as well developed as XPS. SIMS has been used to study the surface of polyurethanes [204,205] and PMMA-S lamellar diblocks [206]. In the latter study, dynamic SIMS was used to show that the lamellae aligned parallel to the surface after annealing. The thickness of the layer nearest the free surface as well as near the polymer-substrate surface... 

Ultrahigh molecular weight polyethylene/liquid parafiin/dibenzylidene sorbitol ter-naiy blends were studied. Dibenzylidene sorbitol fibrils nucleated UHMWPE and induced the lamellae alignment perpendicular to the flow direction by which the pore size and water permeability and mechanical properties of membrane were enhanced. ... 

Lamellae aligned in loading direction (segment between points C and D) are stretched with an increasing separation of the crystalline blocks. 

Figure 3 Orientation of block copolymer domains with respect to the substrate (a) lamellae lying parallel, (b) lamellae aligned perpendicular, (c) cylinders lying parallel, (d) cylinders aligned perpendicular, and (e) spheres. (Reproduced with permission from Ref. 11. Elsevier, 2005.)...

Eric Dalton and Maurice N Collins. Lamella Alignment Ratio - A SAXS Analysis Technique for Macromolecules,/. Appl. Cryst. 47 (3), 847-851 (2014). 

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