Flow induced crystallization

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August undefined, 2024

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 ... 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 …

Flow-induced crystallization of polylactides Request PDF

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. 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 ... steps in listing a property for sale

Flow-induced crystallization of polylactides: Journal of Rheology: …

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

Flow-induced crystallization of polylactides Request PDF

Recent progress in flow-induced polymer crystallization

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 ... 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 … steps in labor and deliveryWebApr 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: ... pipers of poole

"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. " - Flow induced crystallization

Flow induced crystallization

WebFlow-induced crystallization (FIC) is a typical nonequilibrium phase transition and a core industry subject for the largest group of … 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 ...

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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 … 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 …

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 ... 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 ...

WebDec 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, … Web19 rows · Jun 22, 2024 · The flow-induced crystallization (FIC) is commonly encountered in the polymer industry as more ...

WebSep 3, 2024 · The temperature-induced crystallization-driven self-assembly (TI-CDSA) protocol allowed some control over the shape and size of some of the morphologies. ... The system used two PL1113-6300 ResiPore 3 µm 300 × 7.5 mm columns with DMF as the eluent with a flow rate of 1 mL/min and toluene as flow rate marker. The detector suite …

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. pipers of the trenchesWebJan 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 … pipers of the worldWebNov 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 … pipers of songWebFlow-Induced Crystallization of Poly(ether ether ketone): Universal Aspects of Specific Work Revealed by Corroborative Rheology and X-ray Scattering Studies. Macromolecules 2024 , 53 (22) , 10040-10050. steps in land development processWebMay 22, 2015 · Flow-induced crystallisation (FIC) in polymers 1-3 is a central problem in polymer science. Flow dramatically enhances the nucleation rate, leading to much faster crystallisation kinetics and ... piper softwareWebJan 14, 2024 · The flow history had a great influence on the crystallization of pure PP. Beyond 50 s −1, crystallization occurred at a high temperature, suggesting that flow-induced crystallization took place. steps in lewin\u0027s change modelWebJul 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 ... pipers of the world amazing grace