Microrheological Description of the Phase Structure Evolution in Polymer Blends. State of Art and Open Problems

2009 ◽  
Author(s):  
Ivan Fortelný ◽  
Martin Zatloukal
Keyword(s):  
Polymer Blends ◽  
Phase Structure ◽  
Structure Evolution ◽  
Open Problems ◽  
State Of Art

scholarly journals Description of the Droplet Size Evolution in Flowing Immiscible Polymer Blends

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 761 ◽  
Author(s):  
Fortelný ◽  
Jůza
Keyword(s):  
Polymer Blends ◽  
Droplet Size ◽  
Phase Structure ◽  
Droplet Breakup ◽  
Structure Evolution ◽  
Immiscible Polymer Blends ◽  
Collision Efficiency ◽  
Immiscible Polymer ◽  
Size Evolution ◽  
Analytic Expressions

Control of the phase structure evolution in flowing immiscible polymer blends during their mixing and processing is fundamental for tailoring of their performance. This review summarizes present state of understanding and predictability of the phase structure evolution in flowing immiscible polymer blends with dispersed structure. Results of the studies of the droplet breakup in flow, important for determination of the droplet breakup frequency and of the size distribution of the daughter droplets, are reviewed. Theories of the flow-induced coalescence providing equations for collision efficiency are discussed. Approximate analytic expressions reliably describing dependence of the collision efficiency on system parameters are presented. Available theories describing the competition between the droplet breakup and coalescence in flow are summarized and approximations used in their derivation are discussed. Problems with applicability of available theories on prediction of the droplet size evolution during mixing and processing of immiscible polymer blends, which have not been broadly discussed so far, are addressed.

scholarly journals The Effects of Copolymer Compatibilizers on the Phase Structure Evolution in Polymer Blends—A Review

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7786
Author(s):  
Ivan Fortelný ◽  
Josef Jůza
Keyword(s):  
Experimental Data ◽  
Polymer Blends ◽  
Phase Structure ◽  
Equilibrium Distribution ◽  
Droplet Breakup ◽  
Structure Evolution ◽  
Quiescent State ◽  
Immiscible Polymer Blends ◽  
Formation And Evolution ◽  
Theoretical Results

This paper summarizes the results of studies describing the effect of block and graft copolymers on the phase structure formation and evolution in immiscible polymer blends. The main phenomenological rules for prediction of the copolymer compatibilization efficiency are briefly described and compared with selected experimental data. The results of the theories of equilibrium distribution of a copolymer between the blend interface and the bulk phases and its effect on the blend interfacial tension are summarized. The theories of the compatibilizer effect on the droplet breakup in flow are analyzed. The mechanisms of the copolymer effect on the coalescence of droplets in flow are compared and their effect on the droplet size is shown. The problems of reliable description of the effect of a copolymer on the coalescence in quiescent state are presented. Obstacles to derivation of a realistic theory of the copolymer effect on the competition between the droplet breakup and coalescence are discussed. Selected experimental data are compared with the theoretical results.

Phase Structure Evolution During Compression Molding of Compatibilized Polymer Blends

2012 ◽  
Vol 51 (10) ◽  
pp. 2026-2033 ◽  
Author(s):  
Ivan Fortelný ◽  
Bojan Dimzoski ◽  
Danuše Michálková
Keyword(s):  
Polymer Blends ◽  
Phase Structure ◽  
Compression Molding ◽  
Structure Evolution

Graphical structure of extended b-metric spaces: an application to the transverse oscillations of a homogeneous bar

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mudasir Younis ◽  
Deepak Singh ◽  
Ishak Altun ◽  
Varsha Chauhan
Keyword(s):  
Metric Spaces ◽  
Fixed Point Theory ◽  
Directed Graphs ◽  
Point Theory ◽  
Graph Structure ◽  
Open Ball ◽  
Open Problems ◽  
Graphical Structure ◽  
State Of Art ◽  
Transverse Oscillations

Abstract The purpose of this article is to present the notion of graphical extended b-metric spaces, blending the concepts of graph theory and metric fixed point theory. We discuss the structure of an open ball of the new proposed space and elaborate on the newly introduced ideas in a novel way by portraying suitably directed graphs. We also provide some examples in graph structure to show that our results are sharp as compared to the results in the existing state-of-art. Furthermore, an application to the transverse oscillations of a homogeneous bar is entrusted to affirm the applicability of the established results. Additionally, we evoke some open problems for enthusiastic readers for the future aspects of the study.

Surface phase structure evolution of the fcc MoC (001) surface in steam reforming atmosphere: systematic kinetic and thermodynamic investigations

2022 ◽  
Author(s):  
Changqing Chu ◽  
Chao Li ◽  
Xue Liu ◽  
Hang Zhao ◽  
Changning Wu ◽  
...  
Keyword(s):  
Steam Reforming ◽  
Phase Structure ◽  
Structure Evolution ◽  
Surface Phase

The kinetic and thermodynamic aspects of the surface phase structure evolution on a fcc MoC (001) surface under H2O/H2-rich atmosphere typical in steam reforming processes were systematically studied by periodic...

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