Journal ArticleDOI
Fluid mechanics of the formation of polymer blends. Part I: Formation of lamellar structures
J. T. Lindt,Anup K. Ghosh +1 more
TLDR
In this paper, the early stages of blend morphology development as occurs in a screw extruder were investigated using combinations of similar polymers (polystyrene and styrene-butadiene copolymer) and dissimilar polymers as model systems.Abstract:
This paper deals with the early stages of blend morphology development as occurs in a screw extruder. Using combinations of similar polymers (polystyrene and styrene-butadiene copolymer) and dissimilar polymers (PS and EVA) as model systems, it has been concluded that during melting the scale of segregation between the blend components is reduced by orders of magnitude within fraction of a second residence time. During the early stages of morphology development, the melting pellets produce fine lamellar structures (thickness of the order of μm) that extend over much of the melting zone before being broken up by capillary forcesread more
Citations
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Journal ArticleDOI
Formation of Co-continuous Structures in Melt-Mixed Immiscible Polymer Blends
Petra Pötschke,Donald R Paul +1 more
TL;DR: In this article, the identification, characterization, and properties of co-continuous structures as well as the development of cocontinuous structure during the melt blending process are discussed, where the coexistence of at least two continuous structures within the same volume is considered.
Journal ArticleDOI
Morphology development during the initial stages of polymer-polymer blending
TL;DR: In this article, the development of morphology from pellet-sized particles to submicrometre droplets during the polymer blending process is investigated for several polymer blends in order to determine the morphology at short mixing times, a model experiment is developed that allows the matrix to be dissolved away so that the dispersed phase may be observed directly using scanning electron microscopy.
Journal ArticleDOI
Dynamics of liquid-liquid mixing : a 2-zone model
TL;DR: In this paper, the development of multiphase liquid-liquid morphologies during mixing at small Reynolds numbers has been modeled, and the mixing process is divided into (i) stretching of dispersed drops.
Journal ArticleDOI
Sheet formation in immiscible polymer blends: model experiments on initial blend morphology
TL;DR: In this article, it was shown that micrometre-thick sheets can be created from millimetre-sized pellets by shearing in the parallel disc geometry and that extruders are not required to generate the sheets.
Journal ArticleDOI
Evidence for inversion of phase continuity during morphology development in polymer blending
TL;DR: In this paper, an inversion of phase continuity occurs during processing when a minor phase component has a softening or melting transition temperature which is lower than the softening temperature of the major phase component.
References
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Journal ArticleDOI
Laminar mixing of polymeric liquids: a brief review and recent theoretical developments
Julio M. Ottino,R. Chella +1 more
TL;DR: In this article, a review of recent developments in laminar mixing of viscous liquids can be found, with a focus on basic experimentation and theory, as well as application examples.
Journal ArticleDOI
A dynamic melting model for a single-screw extruder†
TL;DR: In this article, a new theoretical concept is given which provides an efficient and consistent method for predicting flow and heat transfer characteristics of the melting zone for a large single-screw extruder.
Journal ArticleDOI
Mathematical modeling of melting of polymers in a single‐screw extruder a critical review
TL;DR: In this paper, the authors surveyed and classified deterministic mathematical models of the Maddock melting mechanism based on analytical and finite-difference solution methods, and concluded that the rigid solid bed concept coupled with a consistent non-Newtonian analysis of the melt flow pattern, including cross-channel circulation leads to superior results.
Journal ArticleDOI
Analysis of the performance of plasticating single-screw extruders with a new concept of solid-bed deformation
Kee Yoon Lee,Chang Dae Han +1 more
TL;DR: In this article, the performance of single-screw extruders is analyzed by combining three functional sections: (a) solids-conveying section, (b) melting section, and (c) melt conveying section).
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Morphology development during the initial stages of polymer-polymer blending
Development of polymer blend morphology during compounding in a twin-screw extruder. Part I: Droplet dispersion and coalescence—a review
Leszek A. Utracki,Z. H. Shi +1 more