Flow induced crystallization

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August undefined, 2024

WebApr 9, 2024 · At high flow strength, a flow-induced crystallization (FIC) occurred, producing a semicrystalline material possessing a high degree of crystallinity and … WebJan 19, 2024 · In this work, the flow-induced crystallization of two polylactides (PLAs) with different microstructures (different l-lactic acid contents) is studied using simple shear, uniaxial extension and capillary flow experiments.In a simple shear and capillary flow, an increase in shear rate and a decrease in temperature were found to enhance the …

Molecular and thermodynamics descriptions of flow-induced

WebSep 2, 2015 · Flow-induced crystallization (FIC) of polymer melts is a fundamental issue of polymer physics. It is of clear theoretical significance, and very important in practical … WebFeb 18, 2024 · The effects induced by the flow on polymer crystallization behavior can be summarized into three aspects, namely accelerated nucleation rate, modified crystal morphology, and newly formed crystal structure, which are all directly relevant to the end-use properties [11, 19].To attain the ultimate goal of predicting the polymer … binks family farm

Modeling Flow-Induced Crystallization SpringerLink

WebNov 5, 2014 · Concomitant Crystallization in Propylene/Ethylene Random Copolymer with Strong Flow at Elevated Temperatures. Flow-induced crystallization of α- and γ-phases was studied for a propylene/ethylene random copolymer with 3.4 mol % ethylene at two high temperatures of 132 and 142 °C by combining a pressure-driven…. WebMar 30, 2024 · Understanding polymer crystallization with the presence of flow, or namely flow-induced crystallization (FIC), is crucial to optimize polymer processing … WebJul 29, 2024 · Abstract. Flow-induced crystallization has been widely studied for a variety of polymers with the main focus on polyolefins. In this work, research has been conducted on the flow-induced ... binks fishing lures

Nonequilibrium Nature of Flow-Induced Nucleation in Isotactic ...

Flow-Induced Crystallization of PEEK: Isothermal …

WebJul 6, 2024 · Flow-induced crystallisation of polymers from aqueous solution Introduction. In the natural world numerous strategies for efficient processing of materials have evolved 1, 2, and one... Results. PEO is crystallisable and water soluble, due to the similarity of its … We would like to show you a description here but the site won’t allow us. WebBased on classical nucleation theory, the current entropic reduction model (ERM) of flow-induced crystallization (FIC) treats external work as perturbation on the framework of equilibrium thermodynamics, which, however, obscures the nonequilibrium nature of FIC. In this work, in situ investigation on FIC under strong flow by combining a unique … binks fabrication salida caWebNov 7, 2009 · The transitions between the different flow regimes and the associated physical processes governing the flow-induced crystallization (FIC) processes are defined by the critical values of the Deborah numbers (De) related to the molecular orientation (De rep) and molecular stretch (De s). An extensive evaluation of experiments reported in the ... dachshund rescue pinellas county florida

"WebWe systematically investigate the detailed structure in the flow-induced crystallization of a lightly cross-linked high-density polyethylene as a model semicrystalline polymer sample … " - Flow induced crystallization

Flow induced crystallization

Strain-Induced Crystallization - ScienceDirect

WebDec 10, 2016 · The well dispersed OXA fibrils and shear flow induced PLLA chain orientation are responsible for the fast crystallization of the PLLA/OXA-240 samples. In … WebJul 1, 2013 · Molecular properties are reflected in the rheological and crystallization behavior. The first task is to design and use some well‐defined experiments that …

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WebApr 9, 2024 · At high flow strength, a flow-induced crystallization (FIC) occurred, producing a semicrystalline material possessing a high degree of crystallinity and primarily a monoclinic lattice structure. This FIC phase formed at a temperature (450 K) high above the quiescent melting point (≈400 K) and remained stable after cessation of flow for ...

WebOct 10, 2024 · In flow induced crystallization (FIC) of polymer, the effective extension of molecular chains can dramatically change the structural dynamics and final morphology. Hierarchical structure formation can be controlled by flow parameters, leading to different macroscopic material properties. With complex chain structures such as polydispersity ... WebThe so-called flow-induced crystallization is therefore a phenomenon that for PLA can be considered strategic toward the realization of parts with enhanced properties. In this work, a state of the art on flow-induced crystallization of PLA is presented. AB - Poly(lactic acid) is surely one of the most interesting commercially available ...

WebOct 28, 2006 · We present a study on flow-induced crystallization of polymers filled with rigid particles. The numerical simulations reveal the interplay between filler particles, the … WebNov 7, 2013 · The general phenomenon of shear-induced crystallization (SIC), or flow-induced crystallization (FIC) has been studied extensively, both theoretically and …

WebThe superscript "T" denotes thermally induced crystallization, whereas the superscript "f" denotes flow-induced crystallization. All variables are per unit volume and are …

WebJan 8, 2024 · Flow-induced crystallization in polymers is an important problem in both fundamental polymer science and industrial polymer processing. The key process of flow-induced nucleation occurs on a … dachshund rescue portland oregonWebAug 3, 2024 · We propose a unified thermodynamic model of flow-induced crystallization of polymer (uFIC), which incorporates not only the conformational entropy reduction but … dachshund rescue san antonio texasWebJan 1, 2024 · When polymer crystallization is induced by flow elongation, the semicrystalline morphology is affected by the orientation. The most obvious effects induced during flow are ascribed to kinetic and morphologic aspects, where in comparison with quiescent conditions the developed crystals trend to evolve from spherical to elongated … binks fishing spoonsWebNov 2, 2024 · The flow-induced formation and relaxation of the representative oriented shish-kebab structure were studied with synchrotron small-angle X-ray scattering (SAXS) method. The flow duration was varied from 2 to 6 s at an identical strain rate to reveal the effect of flow time on stability and dimension … binks fast foodWebFlow-induced nucleation and crystallization are observed in conjugated small molecules and polymers, and are closely related to the flow-induced polymer conformational changes and enhanced mass and heat transfer observed during crystallization. dachshund rescues in north carolinaWebNov 22, 2013 · The so-called “short-term flow” protocol is widely applied in experimental flow-induced crystallization studies on polymers in order to separate the nucleation and subsequent growth processes [Liedauer et al. Int. Polym. Proc. 1993, 8, 236–244]. The basis of this protocol is the assumption that structure development during flow can be … dachshund rescues in californiaWebMar 10, 2015 · A model is presented to describe flow-induced crystallization in isotactic polypropylene at high shear rates. This model incorporates nonlinear viscoelasticity, compressibility, and nonisothermal process conditions due to shear heating and heat release due to crystallization. dachshund rescues north carolina