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Non-Bulk Morphologies

These non-bulk structures also provide a window for the study of surface reconstruction of block copolymers [31]. It has been shown that surface reconstruction of the domains in thin films of cylinder-forming block copolymers on a chemically homogeneous surface can lead to a variety of structures, such as perforated lamellae, undulating cylinders, and spherical nodules [31, 66]. Additionally, separate research demonstrated that cylindrical domains can assume very tortuous, three-dimensional (3D) structures in films on chemically homogeneous substrates as the film thickness is increased beyond a first layer of cylinders adjacent to the substrate [29]. [Pg.207]

3 Examples of Direaed Assembly 209 Striped chemical pattern P(S-b-MMA) [Pg.209]


Figure 18c displays swelling kinetics of two SV films with the same initial thickness but different microphase-separated structures. The curves show up to 10% larger swelling (smaller poi) of SV films with the initial bulk lamella morphology as compared to the films with the non-bulk micelle phase [119],... [Pg.56]

In situ dynamic measurements and DDFT simulations to non-bulk PL and lamella morphologies (Figs. 25 and 26) demonstrate that annihilation of topological... [Pg.64]

Network defects in the form of unreacted groups serve as sites for crack initiation and propagation. When such defects are non-randomly distributed within the network a nodular morphology will be observed upon fracture or chemical etching of the bulk network. [Pg.33]

Near-field scanning techniques are relative newcomers, and the basis for their interpretation is less well established. However, AFM has opened up new perspectives for morphological studies, particularly given that excessive surface damage in soft specimens can be avoided by use of non-contact or intermittent contact modes. Its sensitivity to surface topography nevertheless makes AFM prone to artefacts when used to observe surfaces prepared by microtoming, and its effective depth of field is limited compared with SEM. On the other hand, if lamellar surfaces can be prepared such that the surface relief (or hardness, friction variations) is representative of the bulk texture, very striking detail can be recorded at the nanometre scale in deformed polyolefins [11]. [Pg.82]

Janus micelles are non-centrosymmetric, surface-compartmentalized nanoparticles, in which a cross-linked core is surrounded by two different corona hemispheres. Their intrinsic amphiphilicity leads to the collapse of one hemisphere in a selective solvent, followed by self-assembly into higher ordered superstructures. Recently, the synthesis of such structures was achieved by crosslinking of the center block of ABC triblock copolymers in the bulk state, using a morphology where the B block forms spheres between lamellae of the A and C blocks [95, 96]. In solution, Janus micelles with polystyrene (PS) and poly(methyl methacrylate) (PMMA) half-coronas around a crosslinked polybutadiene (PB) core aggregate to larger entities with a sharp size distribution, which can be considered as supermicelles (Fig. 20). They coexist with single Janus micelles (unimers) both in THF solution and on silicon and water surfaces [95, 97]. [Pg.197]

Reported volume resistivities for printed patterns formed from commercial silver-based inks are higher than that of bulk silver. This occurrence reflects the fact that sintered ink patterns contain non-ideal defects such as incomplete particle-to-particle contact, incomplete sintering between contacting particles, residual porosity, and the presence of non-conductive additives. The morphology and extent of void formation in two representative sintered silver nanoparticle inkjet inks are illustrated in Fig. 1. [Pg.242]


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Non morphology

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