The effects of long-ranged and short-ranged forces in confined near-critical polymeric liquids

Carelli, C.; Jones, Richard; Young, R. N.; Cubitt, R.; Krastev, Rumen; Gutberlet, Thomas; Dalgliesh, R. M.; Schmid, Friederike; Sferrazza, Michele

doi:10.1209/epl/i2005-10162-7

Cited by 12 publications

(20 citation statements)

References 17 publications

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“…We find several studies reported on the interfacial properties in terms of interdiffusion at the interface, [22][23][24][25][26] interfacial tension, [27][28][29][30] and interface width, 21,[31][32][33][34] and so forth in polymer blends. The magnitude and behavior of interface width with varying molecular weight, temperature, and film thickness have also been studied using the small angle neutron scattering, neutron reflectometry, 27,28,[33][34][35] small angle X-ray scattering, differential scanning calorimetry (DSC), 26 transmission electron microscopy, 30 and so forth with varying success.…”

Section: Introductionmentioning

confidence: 91%

“…The magnitude and behavior of interface width with varying molecular weight, temperature, and film thickness have also been studied using the small angle neutron scattering, neutron reflectometry, 27,28,[33][34][35] small angle X-ray scattering, differential scanning calorimetry (DSC), 26 transmission electron microscopy, 30 and so forth with varying success. Schnell et al 5 had studied interfaces in blends of polystyrene with either poly (p-methylstyrene) or a statistical copolymer poly(styrene-co-pbromostyrene) using neutron reflection method.…”

Section: Introductionmentioning

confidence: 99%

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A new insight into interface widths in binary polymer blends based on ortho‐positronium lifetime studies

Ramya

Ranganathaiah

2012

J of Applied Polymer Sci

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The interface widths in two immiscible polymer blend (Poly vinyl chloride (PVC)/Polystyrene (PS)) and PVC/Ethylene Vinyl Acetate (EVA) are determined experimentally using hydrodynamic interaction approach through free volume measurement by positron annihilation lifetime spectroscopy. For comparison, the same study is performed in a miscible blend (Styrene Acrylonitrile (SAN)/Poly Methyl Methacrylate (PMMA)). The interfacial width (Dl) is evaluated from the hydrodynamic interaction (a) based on Kirkwood-Risemann theory and friction coefficient from Stokes equation. Friction at the interface of a binary blend evidences how close the surfaces of the polymer chains come or stay apart which in turn depends on the type of force/interaction at the interface. In this work, we define interface width from a different perspective of Flory-Huggins interaction approach. Measured composition dependent interface widths in the three blends studied clearly demonstrate the sensitivity of the present method. In miscible blend, high friction at the interface results in stronger hydrodynamic interaction and hence smaller interface widths (0.36-1.97 Å ), whereas weak or no interaction in immiscible blends produce wider widths (2.81-25.0 Å ).

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

A new insight into interface widths in binary polymer blends based on ortho‐positronium lifetime studies

Ramya

Ranganathaiah

2012

J of Applied Polymer Sci

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“…This system has been studied intensely in experiments [137][138][139][140][141][142][143]. By mixing random copolymers of ethylene and ethyl-ethylene with two different, but very well defined copolymer ratios, Carelli et al [137,143] were able to tune the Flory-Huggins parameter very finely and study interfacial properties in a wide range of χ N between the weak segregation limit and the strong segregation limit. Figure 3.7 compares the results for the interfacial width and compares them with the mean-field prediction for the weak segregation limit, the strong segregation limit, and the full numerical result.…”

Section: An Application: Interfaces In Binary Blendsmentioning

confidence: 99%

Theory and Simulation of Multiphase Polymer Systems

Schmid

2011

Handbook of Multiphase Polymer Systems

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The theory of multiphase polymer systems has a venerable tradition. The 'classical' theory of polymer demixing, the Flory-Huggins theory, was developed in the 1940s [1,2]. It is still the starting point for most current approaches -be they improved theories for polymer (im)miscibility that take into account the microscopic structure of blends more accurately, or sophisticated field theories that allow to study inhomogeneous multicomponent systems of polymers with arbitrary architectures in arbitrary geometries. In contrast, simulations of multiphase polymer systems are quite young. They are still limited by the fact that one must simulate a large number of large molecules in order to obtain meaningful results. Both powerful computers and smart modeling and simulation approaches are necessary to overcome this problem.In the limited space of this chapter, we can only give a taste of the state-of-the-art in both areas, theory and simulation. Since the theory has reached a fairly mature stage by now, many aspects of it are covered in textbooks on polymer physics [3][4][5][6][7][8][9]. The information on the state-of-the art of simulations is much more scattered. This is why we have put some effort into putting together a representative list of references in this area -which is of course still far from complete.The chapter is organized as follows. In Section II, we briefly introduce some basic concepts of polymer theory. The purpose of this part is to make the chapter accessible to readers who are not very familiar with polymer physics; it can safely be skipped by the others. Section III is devoted to the theory of multiphase polymer systems. We recapitulate the Flory-Huggins theory and introduce in particular the concept of the Flory interaction parameter (the χ parameter), which is a central ingredient in most theoretical descriptions of multicomponent polymer systems. Then we focus on one of the most successful mean-field theories for inhomogeneous (co)polymer blends, the self-consistent field theory. We sketch the main idea, discuss various Handbook of Multiphase Polymer Systems, First Edition. Edited by Abderrahim Boudenne, Laurent Ibos, Yves Candau, and Sabu Thomas.

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“…On peut donc varier la miscibilité du système en changeant le ratio x dans la composition du polymère. Le choix de ce copolymère vient donc du fait qu'on peut facilement sélectionner la miscibilité des deux couches, grâce au paramètre d'interaction [25][26][27]. La T g (température de transition vitreuse du polymère) est d'environ −61 • C. Après la préparation, les échantillons sont donc conservés à une température de −80…”

Section: Choix Du Système De Polymèresunclassified

“…De plus, quand le degré d'immiscibilité décroît, l'interface devient plus large, et la dépendance avec Pour le système avec N = 31, une régression des points donne une dépendance logarithmique de la largeur de l'interface en fonction de l'épaisseur du film comme prédit pour les forces à longue portée tandis que pour N = 4.1 il y a une dépendance de la rugosité de l'interface en fonction de la racine carrée de l'épaisseur (avec éventuellement une interface intrinsèque réduite) comme prédit pour le cas des forces à courte portée [26,42,43].…”

Section: Systèmes Confinésunclassified

Interfaces de polymères en couche minces : la réflectivité des neutrons

Sferrazza

Béziel

2010

Journées de la Neutronique

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Résumé. La réflectivité des neutrons est utilisée pour l'étude de la structure de l'interface entre couches minces de polymères afin de sonder les fluctuations thermiques et les effets de confinement dans ces systèmes. Des exemples d'étude sont illustrés dans ce chapitre: l'interface entre deux films minces de polymères est étudiée en fonction du degré d'immiscibilité, de l'épaisseur des films et du temps, i.e de la cinétique de formation de l'interface.

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The effects of long-ranged and short-ranged forces in confined near-critical polymeric liquids

Cited by 12 publications

References 17 publications

A new insight into interface widths in binary polymer blends based on ortho‐positronium lifetime studies

A new insight into interface widths in binary polymer blends based on ortho‐positronium lifetime studies

Theory and Simulation of Multiphase Polymer Systems

Interfaces de polymères en couche minces : la réflectivité des neutrons

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