Model morphological

Fig. 2. Morphology model of a core-shell, rubber-toughened epoxy adhesive.

ISEC is a size-exclusion chromatography technique, in which the stationary phase is the CFP to be to characterized [16-18] and the eluates are geometrically well-defined steric probes. From the determined retention volumes in a given solvent and on the basis of suitable morphological models, ISEC analysis provides the... 

Figure 2. Two morphological models used to describe the origin of the ionic SAXS maximum observed for Nafion (a) the modified hard-sphere model depicting interparticle scattering and (b) the depleted-zone core—shell model depicting intraparticle scattering. (Adapted with permission from ref 36. Copyright 1981 American Chemical Society.)...

Another critical remark concerns the spherical shape assumed for both micro- and macroparticles in the MGM. Often this assumption should be qualified as a rough simplification, for examples for agglomerates, see Fig. 5.4-8. However "real-morphology" models are hardly available, and non-symmetric growth is difficult to compute. 

The diffusion behaviour of Shirakawa polyacetylene is complicated by its fibrillar morphology and high surface area, so that weight changes depend on pore transport and surface adsorption, as well as on diffusion into the fibrils. Chien 6) has reviewed earlier studies of the diffusion of dopant counter-ions in Shirakawa polymer and has emphasised the wide range of values of diffusion coefficient which are reported and which depend a great deal upon the morphological model chosen to interpret experimental data. 

Fig. 14.5 Morphological model of structures developed in as-spun HDPE. Take-up velocities are (a) very low (b) low (c) medium and (d) high. [Reprinted by permission from J. E. Spruiell and J. L. White, Structure Development during Polymer Processing Studies of the Melt Spinning of Polyethylene and Polypropylene Fibers, Polym. Eng. Set, 15, 660 (1975).]...

Figure 9. Schematic illustration of particle disintegration and the postulated morphological models SCM (solid core model),...

FIG. 19.1 Morphological models of some polymeric crystalline structures. (A) Model of a single crystal structure with macromolecules within the crystal (Keller, 1957). (B) Model of part of a spherulite (Van Antwerpen, 1971) A, Amorphous regions C, Crystalline regions lamellae of folded chains. (C). Model of high pressure crystallised polyethylene (Ward, 1985). (E) Model of a shish kebab structure (Pennings et al., 1970). (E) Model of paracrystalline structure of extended chains (aramid fibre). (El) lengthwise section (Northolt, 1984). (E2) cross section (Dobb, 1985). 

Fibrous protein structure investigations applying X-ray diffraction and electron microscopy were reviewed by Blakely (31). Keratin fibers are made of three main structural components the cuticle, the cortex, and the medulla. The medulla is only present in coarse fibers. The cortex forms the bulk of the fiber. Various morphological models have been proposed to explain the mechanical properties of keratin fibers. It is generally agreed that the cortex consists of fibrils in which protein molecules exist in helical and nonhelical regions. 

Recently, Ioselevich, Kornyshev, and Steinke (IKS) suggested a more detailed morphological model of Nafion-type ionomers [61], which has questioned the existence of pores in homogenous ionomers such as Nafion at least in normally hydrated state. The model was based on neutron scattering data showing... 

Figure 8.34. Morphological model of impact fracture of composites. [Adapted, by permission, from Li J X, Silverstein M, Hiltner A, Baer E, J. Appl. Polym. Sci., 51, No.2, 1994, 255-67.]...

A morphological model for microporous carbons has recently been reported [32] in which rigid aromatic sheets of sp- bonded carbon are randomly placed in a three-dimensional cubic simulation cell with periodic boundaries. A typical carbon plate has the structure shown in Fig, 3a, The plates are roughly aligned in the simulation cell, as illustrated in Fig, 3b, but with random variations in their angles of tilt. RMC simulation is carried out by sampling three types of changes to the carbon structure (i) translation and... 

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