Results 161 to 170 of about 513,211 (198)
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Polymer, 1994
Abstract Linear crystal growth rates of two narrow molecular weight fractions of syndiotactic polypropylene having the same syndiotacticity have been measured using polarized light microscopy over a temperature range of > 20°C. It has been found that a regime III to regime II transition at a supercooling of ∼ 50°C exists.
Jonahira Rodriguez-Arnold +8 more
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Abstract Linear crystal growth rates of two narrow molecular weight fractions of syndiotactic polypropylene having the same syndiotacticity have been measured using polarized light microscopy over a temperature range of > 20°C. It has been found that a regime III to regime II transition at a supercooling of ∼ 50°C exists.
Jonahira Rodriguez-Arnold +8 more
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Aragonite crystals with unconventional morphologies
Journal of Materials Chemistry, 1999Conventionally, the aragonite polymorph of CaCO3 possesses a ‘needle-like’ morphology. Aragonite crystals with unconventional morphologies, like ‘cauliflower’ and ‘flake’, have been synthesised by combining aqueous solutions of CaCl2 and Na2CO3 under ambient reaction conditions. The unambiguous characterisation of these aragonite polymorphs is based on
Debojit Chakrabarty, Samiran Mahapatra
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Solvent‐induced crystallization. II. Morphology
Journal of Polymer Science Part B: Polymer Physics, 1986AbstractThe Morphology of quenched poly(ethylene terephthalate) (PET) films crystallized by low‐molecular‐weight organic penetrants is studied by scanning electron microscopy. Films with thicknesses from ca. 1 mil (0.0025 cm) to ca. 35 mil (0.1 cm) were exposed to methylene chloride (MeCl2) andN,N‐dimethylformamide (DMF) in the temperature ranges 0–38 ...
C. J. Durning +3 more
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Crystal morphology, optical properties of crystals and crystal mounting
2006The first section of the chapter, Section 5.1.1, begins with a general description of crystal morphology and how the handedness of biological molecules limits the space groups they can crystallize in. Description of the proportion of solvent in macromolecular crystals, introduced by Matthews in 1968, is also included.
H. L. Carrell, J. P. Glusker
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2019
Defining planes in a crystal is necessary to describe morphology and for visualisation and description of a diffraction pattern. Planes in crystals are defined relative to the unit cell using a set of three integers called Miller indices. Since a crystal is periodic by translation, Miller indices actually describe sets of planes through the crystal ...
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Defining planes in a crystal is necessary to describe morphology and for visualisation and description of a diffraction pattern. Planes in crystals are defined relative to the unit cell using a set of three integers called Miller indices. Since a crystal is periodic by translation, Miller indices actually describe sets of planes through the crystal ...
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Morphology of dendritic polyethylene crystals
Journal of Polymer Science, 1961AbstractThe dendritic crystals of polyethylene described in this paper illustrate many details of the morphology of polyethylene crystals including the development of spiral growths, delineation of fold domains, the attachments between adjacent lamellae, and fracture behavior of single lamellae.
P. H. Geil, D. H. Reneker
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Morphological stability of disc crystals
Journal of Crystal Growth, 1974Abstract Several phenomenological models of the solidification and subsequent morphological instability of a discshaped crystal of ice growing edgewise from pure, slightly undercooled water (≈ 0.9 C° or less) are developed. We assume that growth along the c axis of ice is virtually prohibited by slow interfacial kinetics but growth in the basal ...
T. Fujioka, R.F. Sekerka
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Polymer Crystallization on Morphological Templates
Nature Physical Science, 1972THE nucleation of polymer crystallization by various heterogeneous additives has been studied empirically1–4 some authors have attempted to understand the mechanism of the nucleation process5. In an examination of isotactic polypropylene crystallization on carbon fibres, we showed the importance of substrate geometry on the nucleation of polymer ...
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Computer prediction of crystal morphology
Current Opinion in Solid State and Materials Science, 2003Control of crystal shape is of great importance to several contemporary industries and thus there is a need to understand the fundamental processes determining crystal morphology. Computer simulations have been widely used in an attempt to predict the morphology of crystals in real systems under a variety of conditions and this review demonstrates that
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