Journal ArticleDOI
Morphology development in polymer blends
TLDR
In this article, the evolution of phase morphology of polymer blends from pellets to submicron particles in a co-rotating twin-screw extruder was explained using scanning electron microscopy.Abstract:
The major morphological changes during polymer blending occur during the initial softening stage. This work explains the evolution of phase morphology of polymer blends from pellets to submicron particles in a co-rotating twin-screw extruder. The extruder was opened and blend samples were taken along its length. The major phase component was extracted by means of a selective solvent so that the dispersed phase morphology could be viewed directly by using scanning electron microscopy. The two systems studied were 80:20 polystyrene/amorphous polyamide and 80:20 polystyrene/polypropylene. In both systems, the initialmorphology consisted of sheets of dispersed phaseread more
Citations
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A Review of CO2 Applications in the Processing of Polymers
David L. Tomasko,Hongbo Li,Dehua Liu,Xiangmin Han,Maxwell J. Wingert,L. James Lee,Kurt W. Koelling +6 more
TL;DR: The use of supercritical carbon dioxide as a processing solvent for the physical processing of polymeric materials is reviewed in this article, with an emphasis on available data and measurement techniques, the development of theory or models for a particular property, and an evaluation of the current state of understanding for that property.
Journal ArticleDOI
Compatibilizers for Melt Blending: Premade Block Copolymers†
Christopher W. Macosko,Philippe Guégan,Ashish K. Khandpur,Akinari Nakayama,Akinari Nakayama,Philippe Marechal,Takashi Inoue +6 more
TL;DR: In this paper, a block copolymer was used to prevent dynamic and static coalescence of polymethyl methacrylate (PMMA) particles in polystyrene with and without symmetric P(S-b-MMA) diblock copolymers.
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
Flow induced coalescence of drops in a viscous fluid
TL;DR: In this article, the authors summarized recent experimental studies of flow-induced coalescence of viscous drops in a viscous fluid in the absence of inertial effects, based on visual observations of small drops (20-100 μm diameter) that collide in the linear flows generated by a four-roll mill.
References
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Book
Principles of polymer processing
Zehev Tadmor,Costas G. Gogos +1 more
TL;DR: In this paper, the authors present an overview of the history of the field of polymers in terms of elementary steps and shaping methods, and present and future perspectives of this field.
Journal ArticleDOI
Formation of dispersed phase in incompatible polymer blends: Interfacial and rheological effects
TL;DR: In this paper, the formation of dispersed phase in blends of incompatible polymers during melt extrusion with a co-rotating twin screw extruder was studied, using nylon and polyester as the matrix and ethylene-propylene rubbers as the dispersed phase.
Journal ArticleDOI
The Dynamics of Thin Sheets of Fluid. III. Disintegration of Fluid Sheets
TL;DR: In this paper, it was shown that the free edge of a sheet of uniform thickness moves into an expanding sheet at the same speed as antisymmetrical waves, sweeping the fluid into roughly cylindrical borders.
Journal ArticleDOI
Modes of dispersion of viscoelastic fluids in flow
TL;DR: In this article, it was shown that when a viscoelastic mixture of molten polymers is extruded, composites are produced as a result of the formation of two distinct modes of dispersion: stratification or droplet-fiber formation.
Journal ArticleDOI
The effect of viscosity ratio on the morphology of polypropylene/polycarbonate blends during processing
Basil D. Favis,J. P. Chalifoux +1 more
TL;DR: The size of the minor phase in an immiscible polymer blend can have a significant effect on properties such as the impact strength of the dispersed phase as discussed by the authors, however, few studies have quantitatively considered the parameters controlling the size of dispersed phase.