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Flow induced crystallization

WebJan 10, 2024 · Flow-induced crystallization of a polyethylene liquid above the melting temperature and its nonequilibrium phase diagram. January 2024; Physical Review Research 2(1) 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 …

Modeling Flow-Induced Crystallization SpringerLink

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 … WebFlow-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. saint marks primary school https://urbanhiphotels.com

Atomistic Simulation of Flow-Induced Microphase Separation and ...

WebNov 7, 2013 · The general phenomenon of shear-induced crystallization (SIC), or flow-induced crystallization (FIC) has been studied extensively, both theoretically and experimentally, for a wide range of ... WebJan 1, 2016 · A modeling framework was presented to describe flow-induced crystallization of iPP at elevated pressures in multiple crystal phases and morphologies. The framework was constructed by … 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 … saint marks place institute for mental health

Molecular and thermodynamics descriptions of flow …

Category:Flow-Induced Crystallization in Polyethylene: Effect of Flow Time …

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Flow induced crystallization

Modeling of Flow-Induced Crystallization of Particle-Filled …

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 … WebMar 1, 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 very ...

Flow induced crystallization

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WebNov 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 … 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 ...

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 ... WebMar 30, 2024 · Understanding polymer crystallization with the presence of flow, or namely flow-induced crystallization (FIC), is crucial to optimize polymer processing …

WebNov 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 ... WebThe remaining of the paper is divided in two parts. In the first part of the review, the basics of polymer crystallisation are summarized; the main factors acting on the process 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 …

WebThe nonlinear dynamics in film blowing process is simulated employing the governing equations of the system that include the flow-induced crystallization (FIC), i.e., the continuity, the two force balances (axial and circumferential), the energy, the crystallinity, and the constitutive equations of Phan-Thien Tanner (PTT) model. thilo sprussWebNov 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 … thilo sprengel fuldaWebOct 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 ... thilo spruss regensburg