Chevron morphology

Kmmova M, Henning S, Michler G (2006) Chevron morphology in deformed semicrystalline polymers. Philos Mag 86 1689-1712... 

Figure 3.11 shows an example of a well-developed chevron morphology. The formation of chevron morphology has been shown to occur in all lamellar-forming heterogeneous polymeric systems details are discussed in [6, 25, 26]. 

Argon A S (1972) Fracture of composites, in Treatise on Materials Science and Technology (Ed. Herman H) Academic Press, New York, Vol. 1, pp. 79-114. Krumova M, Henning S and Michler G H (2006) Chevron morphology in deformed seinicrystalline polymers, Phi Moj 86 1689-1712. 

Our study was based on samples from 11 (Figure 1) 1000-foot core holes drilled in the Gulf of Mexico by four oil companies Humble, Chevron, Gulf, and Mobil. All cores are from the present continental slope within three morphological areas the Upper Continental Slope off Texas and Louisiana, the Upper Continental Slope off west Florida, and the upper reaches of the Mississippi Cone—a mass of sediment derived from drainage of the Mississippi River which has locally buried the continental-slope morphology. 

The individual graphitic layers are the basic building blocks of carbon black particles. The morphology and particle size distribution of carbon black is dependent on the source material and the process of its thermal decomposition. Particle size and distribution determine directly the specific surface area (SSA) which is one of the most important properties of carbon black for fuel cell applications. High surface area (ranging from a few hundreds to 2000-3000m2 g-1) carbon blacks suitable for fuel cell applications can be obtained from Cabot Corporation (Vulcan XC-72R, Black Pearls BP 2000), Ketjen Black International, Chevron (Shawinigan), Erachem and Denka. 

Pawlak A, Galeski A (2005) Plastic deformation of crystalline polymers the role of cavitation and crystal plasticity. Macromolecules 38 9688-9697 Peterlin A (1971) Molecular model of drawing polyethylene and polypropylene. J Mater Sci 6 490 Popli R, Mandelkem L (1987) Influence of structural and morphological factors on the mechanical properties of the polyethylenes. J Polym Sci B Polym Phys 25 441 Read D, Duckett R, Sweeny J, Mcleish T (1999) The chevron folding instability in thermoplastic elastomers and other layered material. J Phys D Appl Phys 32 2087-2099 Resconi L, Cavallo L, Fait A, Piemontesi F (2000) Selectivity in propene polymerization with metallocene catalysts. Chem Rev 100 1253... 

Figure 3.12 Schematic drawing of the morphology of a multilayer system with sticks of parallel lamellae in different orientations (globally unoriented system) before deformation (left) and after deformation (right for deformation direction see arrow) chevron formation appears in a lamellar block marked as A ...

Yang, L.Z., Hong, S., Gido, S.P. etal. (2001) I5S miktoarm star block copolymers Packing constraints on morphology and discontinuous chevron tilt grain boundaries. Macromolecules, 34,9069-9073. 

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