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Rozprawy doktorskie na temat „Flow-induced crystallization”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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Sprawdź 17 najlepszych rozpraw doktorskich naukowych na temat „Flow-induced crystallization”.

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1

Thurman, Derek Wade Bercaw John E. "Molecular aspects of flow-induced crystallization of polypropylene /." Diss., Pasadena, Calif. : Caltech, 2006. http://resolver.caltech.edu/CaltechETD:etd-12032005-115154.

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Jalali, Amirjalal. "Quiescent and flow-induced crystallization of poly(lactic acid)." Thèse, Université de Sherbrooke, 2017. http://hdl.handle.net/11143/9892.

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Le poly(acide lactique), PLA, est un polymère biocompatible et biodégradable, qui peut être produit à partir de ressources renouvelables. En conséquence, il a soulevé une attention toute particulière en tant que remplacement éventuel des polymères à base de pétrole. C’est un polyester aliphatique ayant des propriétés telles que module élevé, haute résistance, biocompatibilité et est donc un matériau prometteur pour diverses applications telles que les implants, l’encapsulation de médicaments et l'emballage. A cause de sa faible température de transition vitreuse, le PLA a une faible rési

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3

Hadinata, Chitiur, and chitiurh@yahoo com au. "Flow-induced crystallization of polybutene-1 and effect of molecular parameters." RMIT University. Civil, Environmental and Chemical Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080212.163803.

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There are two main goals of this thesis: to investigate the flow-induced crystallization behaviour of Polybutene-1 (PB-1 samples, and to study the effects of molecular parameters on the crystallization behaviour While flow-induced crystallization is not a new area in polymer research, well-defined experimental methods that allow access to high flow rate range comparable to that encountered in real processing are still lacking. Two types of flow are considered: shear and uniaxial elongational. Regarding the second aim, several molecular parameters considered are: molecular weight, molecular wei

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Kannan, Krishna. "A thermodynamical framework for the solidification of molten polymers and its application to fiber extrusion." Texas A&M University, 2004. http://hdl.handle.net/1969.1/3065.

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A thermodynamical framework is presented that describes the solidification of molten polymers to an amorphous as well as to a semicrystalline solid-like state. This framework fits into a general structure developed for materials undergoing a large class of entropy producing processes. The molten polymers are usually isotropic in nature and certain polymers crystallize, with the exception of largely atactic polymers, which solidify to an amorphous solid, to an anisotropic solid. The symmetry of the crystalline structures in the semicrystalline polymers is dependent upon the thermomechanical pro

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Fernandez-Ballester, Lucia Kornfield Julia A. Kornfield Julia A. "Formation of oriented precursors in flow-induced polymer crystallization : experimental methods and model materials /." Diss., Pasadena, Calif. : California Institute of Technology, 2007. http://resolver.caltech.edu/CaltechETD:etd-05082007-152644.

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6

Murase, Hiroki. "Flow-induced phase separation and crystallization in semidilute solutions of ultrahigh molecular weight polyethylene." 京都大学 (Kyoto University), 2005. http://hdl.handle.net/2433/144863.

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7

Đjurdjević, Predrag (Predrag Dragutin). "Molecular dynamics modeling of orientation-induced nucleation in short alkanes : toward molecular modeling of flow-induced crystallization in polymers." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/79557.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2013.<br>Title as it appears in MIT degrees awarded booklet, September 2012: Molecular simulation of primary nucleation and growth from oriented melts in polyethylene. Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 59-63).<br>The enhancement of the primary flow-induced nucleation rate in short chain alkanes (C20 and C150) has been examined for different levels of orientation by atomistic molecular dynamics simulations. The nucleation rate has been found to change

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8

Derakhshandeh, Maziar. "Flow-induced crystallization of high-density polyethylene : the effects of shear, uniaxial extension and temperature." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/37669.

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The effects of shear, uniaxial extension and temperature on the flow-induced crystallization of two different types of two high-density polyethylenes (a metallocene and a Ziegler-Natta HDPE) are examined using rheometry. Shear and uniaxial extension experiments were performed at temperatures below and well above the peak melting point of the polyethylene’s in order to characterize their flow-induced crystallization behavior at rates relevant to processing. Generally, strain and strain rate found to enhance crystallization in both shear and elongation. In particular, extensional flow was found

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9

Szántó, Levente [Verfasser], Christian [Akademischer Betreuer] Friedrich, and Rolf [Akademischer Betreuer] Mülhaupt. "Ultra-broad molecular weight distributed multimodal blends of linear polyethylene: its linear and nonlinear viscoelastic properties and flow-induced crystallization ability." Freiburg : Universität, 2019. http://d-nb.info/1224416511/34.

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10

Nebouy, Matthias. "Nanostructuration, reinforcement in the rubbery state and flow properties at high shear strain of thermoplastic elastomers : Experiments and modeling." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI135.

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Les élastomères thermoplastiques, faits de copolymères à blocs segmentés formant des domaines mous et durs (cristallites) séparés sont largement utilisés dans l'industrie pour la production d’éléments divers (tableaux de bord, gaines de câbles ou encore adjuvants pour le bitume). Cependant, l’approche souvent très empirique consistant à modifier la composition de la chaîne et observer l’impact sur les propriétés finales laisse peu de place à la compréhension et à la généralisation de relations structure-propriétés qui restent encore mal comprises. L'objectif de cette thèse est d'apporter une m

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11

Monnier, Xavier. "Mobilité moléculaire dans des systèmes polymères complexes anisotropes et confinés." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMR021/document.

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L’objet de ce travail est d’étudier l’influence de l’anisotropie structurale, induite lors de la mise en forme d’un Polylactide (PLA), sur les dynamiques moléculaires de la phase amorphe. Deux procédés de mise en oeuvre sont retenus : l’électrofilage et la cristallisation induite par flux. Le premier permet d’aboutir à un système non-cristallin, lorsque le deuxième permet d’aboutir à un système semi-cristallin. Pour chaque système, une étude microstructurale est préalablement réalisée pour mettre en avant l’anisotropie structurale induite lors de la mise en oeuvre. Pour ce faire différentes te

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12

Bischoff, White Erica E. "Extensional-flow-induced Crystallization of Polypropylene." 2011. https://scholarworks.umass.edu/theses/665.

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A filament stretching extensional rheometer was used to investigate the effect of uniaxial flow on the crystallization of polypropylene. Samples were heated to a temperature above the melt temperature to erase their thermal and mechanical histories. The Janeschitz-Kriegl protocol was applied and samples were stretched at various extension rates to a final strain of e = 3.0. Differential scanning calorimetry was applied to crystallized samples to measure the degree of crystallinity. The results showed that a minimum extension rate, corresponding to a Weissenberg number of approximately Wi = 1,

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13

Thurman, Derek Wade. "Molecular Aspects of Flow-Induced Crystallization of Polypropylene." Thesis, 2006. https://thesis.library.caltech.edu/4746/1/Thesis-Derek_Thurman.pdf.

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<p>Polyolefins, semicrystalline polymers also known as thermoplastics, are highly desirable because of their material properties, low cost, and ease in processing. The flow and thermal history experienced during processing are known to affect dramatic changes in crystalline kinetics and morphology, dictating the final material properties of solidified products. However, the underlying physics that control crystalline orientation and kinetics is not well understood. To optimize processing conditions and maximize material performance, it is desirable to understand how the interplay of molecular

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14

Gao, Y., X. Dong, L. Wang, et al. "Flow-induced crystallization of long chain aliphatic polyamides under a complex flow field: Inverted anisotropic structure and formation mechanism." 2015. http://hdl.handle.net/10454/8041.

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Yes<br>The present work deals with the flow-induced multiple orientations and crystallization structure of polymer melts under a complex flow field. This complex flow field is characteristic of the consistent coupling of extensional “pulse” and closely followed shear flow in a narrow channel. Utilizing an ingenious combination of an advanced micro-injection device and long chain aliphatic polyamides (LCPA), the flow-induced crystallization morphology was well preserved for ex-situ synchrotron micro-focused wide angle X-ray scattering (μWAXS) as well as small angle X-ray scattering (SAXS). An i

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15

Fernandez-Ballester, Lucia. "Formation of Oriented Precursors in Flow-Induced Polymer Crystallization: Experimental Methods and Model Materials." Thesis, 2007. https://thesis.library.caltech.edu/1681/1/LFB_thesis_final_04may2007.pdf.

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<p>This thesis presents new insights into the early events of formation of oriented precursors in flow-induced crystallization of polymers, specifically isotactic polypropylene. Experimental approaches are developed to follow the creation of thread-like precursors during flow. The use of model bimodal polymers provides insight on the role of long chains in the mechanism of formation of oriented precursors. The addition of very long chains (3500 kg/mol) at low concentration (< 1% wt) dramatically reduced the stress required to trigger formation of thread-like precursors, which opened a w

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16

Fernandez-Ballester, L., Timothy D. Gough, F. Meneau, et al. "Simultaneous birefringence, small- and wide-angle X-ray scattering to detect precursors and characterize morphology development during flow-induced crystallization of polymers." 2008. http://hdl.handle.net/10454/5966.

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No<br>An experimental configuration that combines the powerful capabilities of a short-term shearing apparatus with simultaneous optical and X-ray scattering techniques is demonstrated, connecting the earliest events that occur during shear-induced crystallization of a polymer melt with the subsequent kinetics and morphology development. Oriented precursors are at the heart of the great effects that flow can produce on polymer crystallization (strongly enhanced kinetics and formation of highly oriented crystallites), and their creation is highly dependent on material properties and the level o

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17

Lin, X., Philip D. Caton-Rose, D. Y. Ren, K. S. Wang, and Philip D. Coates. "Shear-induced crystallization morphology and mechanical property of high density polyethylene in micro-injection molding." 2013. http://hdl.handle.net/10454/9680.

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No<br>The advances of the polymer melt flow-induced crystallization behaviour and its influence on mechanical properties of high density polyethylene (HDPE) in micron injection (MI) were studied in the present paper. Analysis of mechanical performance, including yield stress and elongation at break, for samples adopted from different regions in a molded plaque showed that a higher injection speed, a higher mold temperature and a longer cooling time could effectively enhance the yield stress but negatively promoted the ductility. Then, the mechanisms of such variation of mechanical performance

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