Results 251 to 260 of about 6,794,876 (284)
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A simple model of flow-induced crystallization memory
Macromolecular Symposia, 2002Flow induced crystallization of polymer systems exhibits strong memory effects. Crystalline structures gradually change when the flow is switched off and the polymer is relaxed prior to crystallization. A simple model based on the multidimensional theory of crystal nucleation [1] is proposed.
ZIABICKI A., ALFONSO, GIOVANNI CARLO
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2013
Molecular properties are reflected in the rheological and crystallization behavior. The first task is to design and use some well‐defined experiments that reveal all these features. Second, the experimental findings should be translated into mathematically formulated physical models, suited to be implemented in numerical codes for simulation
Peters, G.W.M. +2 more
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Molecular properties are reflected in the rheological and crystallization behavior. The first task is to design and use some well‐defined experiments that reveal all these features. Second, the experimental findings should be translated into mathematically formulated physical models, suited to be implemented in numerical codes for simulation
Peters, G.W.M. +2 more
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A recoverable strain-based model for flow‐induced crystallization
Macromolecular Symposia, 2002A model for the combined processes of quiescent and flow-induced crystallization of polymers is presented. This modeling should provide the necessary input data, in terms of the structure distribution in a product, for the prediction of mechanical properties and shape- and dimensional-stability. The model is partly based on the work of Schneider et al.
Peters, G.W.M. +2 more
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Mechanisms of flow induced crystallization
Polymer Engineering & Science, 1982AbstractThis paper presents a review of the field of flow induced crystallization from solution. Experimental facts concerning the nature of fibrous nucleation and the “shishkebob” morphology which results are reviewed. The discussion of growth models emphasizes the details of the nucleation control and flow control calculations which have been ...
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Flow field induced crystallization of multicomponent colloids
Physical Review EField-directed assembly presents a powerful approach for directing the organization of colloidal particles into long-range crystalline orderings. While their ability to tune colloidal crystallization has been widely studied, insights into how they mediate the formation of such structures remain an open question.
Chetteente M. Ragisha +4 more
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Flow Induced Crystallization of Colloidal Dispersion
ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D, 2011In this study, we have examined a crystallization effect of colloidal dispersion induced by the various elongational flows. Extremely strong electrostatic repulsion makes a crystal structure called ‘colloid crystal’. A colloid crystal has hundreds of nano-meters in grating scale and it reflects the visible light due to the Bragg diffraction. It has the
Shinji Toga, Takatsune Narumi
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Modeling flow induced crystallization in film casting of polypropylene
Rheologica Acta, 2004Data from iPP film casting experiments served as a basis to model the effect of flow on polymer crystallization kinetics. These data describe the temperature, width, velocity and crystallinity distributions along the drawing direction under conditions permitting crystallization along the draw length.
TITOMANLIO, Giuseppe, LAMBERTI, Gaetano
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An analysis of local flow effects in flow‐induced orientation and crystallization
Journal of Polymer Science: Polymer Physics Edition, 1983AbstractAn analysis is presented of the effects of external flow kinematics on the so‐called local flow in seeded, flow‐induced crystallization and orientation. The flow field around a growing crystal or nucleation seed is modelled by the Stokes flow equations past a prolate ellipsoid of high aspect ratio.
I. S. Dairanieh, A. J. McHugh
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Transition in Crystal Morphology for Flow-Induced Crystallization of Isotactic Polypropylene
Macromolecules, 2016Deformation applied to a semicrystalline polymer melt prior to quenching can dramatically increase the concentration of nuclei and even transform the final crystalline morphology, phenomena collectively known as flow-induced crystallization (FIC). Using polarized optical microscopy and atomic force microscopy, we image the changes in morphology of an ...
Fawzi G. Hamad +2 more
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Flow-induced crystallization using a static mixer crystallizer
Separation and Purification TechnologyInland desalination benefits from concentrate minimization. We present initial results using an inline static mixer crystallizer (SM) to accelerate crystallization of supersaturated CaCO3 from a model reverse osmosis desalination process' concentrate.
Ajeet Pratap Singh +2 more
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