Lamellar microdomains

When r was less than 0.46 (Fig. 9a), the P4VP layer surrounded some microspheres in groups (r = 0.33). The K r = 0.33 was 2.48. This indicates that the amount of B1 block copolymer was insufficient to surround each microsphere separately. When r was larger than 0.46 (Fig. 9c), the wide dark regions of P4VP were also observed. These regions were horizontally oriented lamellar microdomains of Bl, resulting in a minimization... 

Fig. 27 Schematic drawings of two possible alignments of ABCD tetrablock quaterpoly-mer in lamellar microdomains a ABCD and b ABCDCB. From [92]. Copyright 2003 American Chemical Society...

For diblock copolymer films composed of cylindrical or lamellar microdomains, the interfacial interactions dictate the wetting layers at both the substrate and surface interfaces and, consequently, the orientation of the microdomains in the film [41,45,67,109-113,115,116]. Therefore, various strategies have been utilized to control the interfacial interactions to achieve large-area micro domains with desirable orientations. 

Polushkin E, Alberda van Ekenstein GOR, Knaapila M, Ruokolainen J, Torkkeh M, Serimaa R, Bras W, Dolbnya 1, Ikkala O, ten Brinke G. Intermediate segregation type chain length dependence of the long period of lamellar microdomain structures of supramolecular comb-coil diblocks. Macromolecules 2001 34 4917-4922. 

Lee et al. (1994) have also reported segregation of short homopolymers (a 1) to the centre of lamellar microdomains using SANS on a PS-PEE-PS in blends with PEE with deuterium labelling to vary contrast. However, the interpretation of these data was hampered by the qualitative nature of the model used to model the limited experimental data. 

Figure 7. Diagram of a lamellar microdomain structure in block copolymers...

In contrast to lamellar microdomains, where removal of defects and alignment of domains can, in principle, restore terminal behavior to G and G", even after alignment, G for three-dimensionally ordered spherical domains remains that of a soft solid, albeit with a much lower modulus than that of the unoriented material (Koppi et al. 1994). 

Fig. 25 Transmission electron micrographs (TEM) of a ternary nanocomposite of PS-poly(ethyl propylene) (PEP) diblock copolymer with two types of nanoparticle-Ugand systems AuR]- and SiO2R2-ftmctionalized (R i, R2 are alkyl groups) nanoparticles of total volume fraction 0.02. The former appear along the interface of the lamellar microdomains, whereas the latter reside in the center of PEP microphases. Schematically, the nanoparticle distribution is shown in the inset. Taken from [308]...

Ehlich D, Takenaka M, Hashimoto T (1993) Forced Rayleigh scattering study of diffusion of block copolymers. 2. Self-diffusion of block copolymer chains in lamellar microdomains and disordered melts. Macromolecules 26 492-498... 

Hashimoto T, Shibayama M, Kawai H (1980) Domain-boundary structure of styrene-isoprene block copolymer films cast from solution. Molecular-weight dependence of lamellar microdomains. Macromolecules 13 1237-1247... 

With a large magnification and an objective aperture containing a large number of beams, as seen on the electron diffraction pattern shown in fig. 18 (the circle being the aperture projection), it is possible to image the crystal lattice. Thus, a periodic potential imaging inside a crystal can be obtained with a resolution of about 1.4 A. The TEM presented in fig. 19 shows a succession of lamellar microdomains of polytypic materials. The different structures have been... 

Figure 15. Concept of microphase stabilized ferroelectric liquid crystal (MSFLC). The black domain represents the coil block. Only lamellar microdomain morphology is shown in the figure. The FLC supramolecular pitch is unwound by the block microdomain [109, 130],...

Bodycomb J, Funaki Y, Kimishima K, Hashimoto T (1999) Single-grain lamellar microdomain from a diblock copolymer. Macromolecules 32(6) 2075-2077... 

An additional field can be applied orthogonally, which can be again of different nature. For instance, nicely ordered lamellar microdomains have been obtained by the combined application of a electric field and a flow field in a rather thick film [92], Temperature treatment can also be combined with shear [93]. A combination of static and dynamic effects was successfully applied by Berry et al. [94], who used a graphoepitaxy and dynamic thermal annealing. 

Fig. 5.12 Schematic of the surface-ordering process in a diblock copolymer. The top diagram shows the dibiock copolymer in a phase mixed state. This is not accessible for PS/PMMA co-polymers via solvent-casting processes. The center diagram corresponds to a microphase-separated morphology where the periodic lamellar microdomains are randomly oriented in the specimen. After annealing for 24 h at 170 °C, the copolymer exhibits a lamellae morphology oriented parallel to the surface as shown in the bottom picture. Reprinted with permission from ref. [96]...

Castillo et al demonstrated by SAXS that the crystallization of the PE block within PLLA-Z>-PE and PDLA-Z)-PE is strictly confined within the preexisting lamellar microdomains in the melt regardless of whether Tc pe> Tg PLDA.PLLA (soft confinement) or PE<7 g plda,plla (hard confinement). 

Figure 6-12. Formation of palladium particles in lamellar microdomains of phase separated poly(organopalladium)/poly(norbornene) copolymers a) before and b) after particle formation. (Bar = 25 nm reproduced by permission from ref. [157].)...

Ishizu, K Yamada, Y, Saito, R Kanbara, T., and Yamamoto, T., Anisotropic conductivity on diblock copolymers with lamellar microdomains. Polymer, 34, 2256-2262... 

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