2024 Flow induced crystallization

Flow induced crystallization

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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 ... WebSep 9, 2016 · Flow-induced crystallization (FIC) is a non-equilibrium thermodynamic phase transition occurring in daily industrial processing of semicrystalline polymers with an annual consumption of hundred ...

Flow-induced crystallization of polylactides Request PDF

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 … WebJan 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 … ft worth city scavnegar hunt

Flow-induced crystallization of long chain aliphatic ... - ScienceDirect

WebMar 30, 2024 · Understanding polymer crystallization with the presence of flow, or namely flow-induced crystallization (FIC), is crucial to optimize polymer processing parameters and to understand phase transition under far-from equilibrium conditions, as FIC is essentially a typical nonequilibrium process. Current review aims to summarizes recent ... WebAug 3, 2024 · We propose a unified thermodynamic model of flow-induced crystallization of polymer (uFIC), which incorporates not only the conformational entropy reduction but … 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 ... ft worth classified ads

Recent progress in flow-induced polymer crystallization

The non-equilibrium phase diagrams of flow-induced crystallization …

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 … WebThe superscript "T" denotes thermally induced crystallization, whereas the superscript "f" denotes flow-induced crystallization. All variables are per unit volume and are … gilgamesh grave foundWebApr 9, 2024 · At high flow strength, a flow-induced crystallization (FIC) occurred, producing a semicrystalline material possessing a high degree of crystallinity and … gilgamesh hades

"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 … " - Flow induced crystallization

Flow induced crystallization

WebMar 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. WebThe Role of Macromolecular Architecture in Flow-Induced Crystallization. RESEARCHER: Bo Shen. Semicrystalline polymers are processed predominantly from the melt, for …

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WebJul 9, 2013 · Flow-induced crystallization (FIC) is a typical nonequilibrium phase transition and a core industry subject for the largest group of commercially useful polymeric materials: semicrystalline polymers. 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.

WebApr 9, 2024 · Nafar Sefiddashti, M.H.; Edwards, B.J.; Khomami, B. Atomistic Simulation of Flow-Induced Microphase Separation and Crystallization of an Entangled Polyethylene Melt Undergoing Uniaxial Elongational Flow and the Role of Kuhn Segment Extension. Polymers 2024, 15, 1831. https: ... 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 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 ... 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 …

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 …

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 … ft worth city plat mapWebJan 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 … gilgamesh hatWebFlow-induced crystallization (FIC) is a typical nonequilibrium phase transition and a core industry subject for the largest group of … gilgamesh graphic novelWebDec 21, 2024 · In this research, the influence of some nucleating agents and MFR on the crystallization behavior of isotactic polypropylene (iPP) Homopolymer has been investigated by OM (Optical Microscopy) and (TEM) after undergoing FIC (Flow Induced Crystallization) crystallization by a parallel plate rheometer (PPR). For several years, … ft worth city water deptWebNov 7, 2013 · The general phenomenon of shear-induced crystallization (SIC), or flow-induced crystallization (FIC) has been studied extensively, both theoretically and … gilgamesh hair robloxWebThe 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. gilgamesh hair colorWebJan 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, … ft worth civil war museum