
Christos TsenoglouNational Technical University of Athens | NTUA · School of Chemical Engineering
Christos Tsenoglou
Ph.D, Chemical Engineering,
About
34
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Introduction
Additional affiliations
January 2013 - present
Institute of Electronic Structure and Laser—Foundation for Research and Technology
Position
- Research Associate
January 1999 - April 2013
January 1985 - December 1995
Education
January 1982 - June 1985
Publications
Publications (34)
A theory has been developed for the viscoelasticity and diffusion of miscible fluid blends of entangled linear polymers with dissimilar chemical structure. The architecture and molecular dynamics of the temporary network formed by the intermeshing species are analyzed by assuming that the coupling frequency between two macromolecular components alo...
The simultaneous radial inflation and axisymmetric extension of an incompressible viscoelastic tube is modelled analytically as an idealization of the blow-molding process. The working fluid is assumed to obey a single integral constitutive model with a power-law damping function, accommodating behaviour ranging from extreme strain hardening (akin...
Rheological measurements were conducted for a highly branched LDPE and a linear HPDE (both commercial polymers with high polydispersity indices). Step strain experiments gave the parameters for the damping function that has been proposed by Tsenoglou et al. [C.J. Tsenoglou, E. Voyiatzis and A.D. Gotsis, J.Non Newt.Fl., 138:33-43 (2006)] to use in b...
Two simple methods are described that utilize melt or dilute solution rheology in characterizing transfomations in molecular architecture induced on an originally linear PET during the early stages of reactive extrusion. A plausible senario for the shape variation and relative difficulty of the new polymers formed is assumed, from which expressions...
We study the stability characteristics of the molecular stress function (MSF) model, i.e., a molecular constitutive theory for stress that extends the original Doi–Edwards model for linear polymers to the case of branched polymers, by repeating the assumption that the tension in the deformed chain is equal to its equilibrium value. We derive analyt...
Shear banding (SB) is manifested by the abrupt “demixing” of the flow into regions of high and low shear rate. In this paper, we first relate analytically the rheological parameters of the fluid with the range of shear rates and stresses of SB occurrence. For this, we accept that the origin of shear banding is constitutive, and adopt a non-linear v...
Four liquid solvents – 1,1,1‐trichloroethane, toluene, chlorobenzene and octane – are used as model contaminants in sorption experiments in polyethylene in order to study their diffusion behavior between 40 and 70 °C and assess the plausibility of utilizing recycled plastics as safe functional barriers in food packaging applications. A hybrid model...
We study the behaviour of a single integral constitutive equation, capable of providing analytic expressions for the viscoelastic stress in extensional flows of a variety of deformation histories and geometries, ranging from uniaxial to equibiaxial. It is based on the use of a stress damping function, with a power-law dependence on the elongation,...
Water penetration in composite materials of different interfacial strengths has been studied and explained as the result of two parallel processes, i.e., diffusion through the polymer matrix and through a network of micro-channels formed along the imperfectly bonded polymer-fiber interface. Such channels along the exterior of the loose fiber are pr...
The rheological characterizations of concentrated suspensions are generally carried out assuming “well-mixed” suspensions. However, the variation of the concentration distributions of the ingredients of the formulation, i.e., the “goodness of mixing”, the size and shape distributions of the particle clusters and the rheological behavior of the susp...
A new experimental procedure for incorporation of model contaminants in polymers was developed as part of a general scheme for testing the efficiency of functional barriers in food packaging. The aim was to progressively pollute polymers in a controlled fashion up to a high level in the range of 1000 ppm and use them as input for the core layer of...
In order to study the rheology of long chain branched polymers, branches have been added on linear
polypropylene precursors in varying amounts using reactive modification with peroxydicarbonates.
The branched polypropylene samples show distinct strain hardening, something absent from the
linear melt; this considerably improves the melt strength of...
Postconsumer recycled polypropylene, filled with 15% CaCO3 was restabilized at various degrees utilizing different processing stabilizers, one of which is especially prepared to counter the deactivating effects of fillers and other moieties. The polymer was then subjected to multiple extrusion cycles for the purpose of studying the effects of the e...
A selective dissolution/reprecipitation technique was applied for the effective recovery of Polyamide 6 (PA 6) and Polyamide 6 6 (PA 6 6) from their mixtures. The proposed process comprises mainly selective polyamide dissolution in an appropriate solvent at a specific temperature, reprecipitation of the polymer from the solution by addition of a no...
We investigate the feasibility of reusing short fibers recovered from recycled thermoset composites for the production of new composites. Glass fibers were recovered from glass-polyester composites, and carbon and aramide fibers from epoxy based composites. From the different fractions obtained after grinding, a specific fibrous fraction was select...
Post-use high-density polyethylene, almost devoid of any stabilizing agents, was restabilized in various degrees and subjected to multiple extrusion cycles at different reprocessing temperatures for assessing its chemical stability. The process-induced material degradation was attributed primarily to long-chain branching caused by crosslinking. It...
An approximate solution is presented to the phase equilibrium problem for the case of a partially miscible polymer solution or a binary heteropolymer blend. It is based on the Flory±Huggins theory and is valid for mixtures well into the phase-separated region. Analytical expressions are derived for the extent and composition of each of the two coex...
A molecular model is developed to explain the viscoelastic behavior of entangled homopolymer blends of an arbitrary molecular weight distribution in the terminal relaxation regime. This is accomplished by analyzing the entanglement architecture and molecular dynamics of the temporary network formed by the intermeshing species. It is assumed that co...
This is a study on the rheological properties and packing efficiency of a fluid suspension, composed of a mixture of two dissimilar particulate species. A generalized analytic expression for the viscosity of the blend is first developed, and then utilized to derive quantitative ways of maximizing the fluidity and optimizing the filling capacity of...
Synopsis This is a phenomenologial study on the effect of the temporary and permanent interparticle aggregation on the viscosity of monodisperse and agglomerated suspensions. Aggregation contributes to fluid entrapment between solid particles and thus increases the effective participation of the rigid phase in the composite fluid. Methods are devel...
Synopsis This is a phenomenologial study on the effect of the temporary and permanent interparticle aggregation on the viscosity of monodisperse and agglomerated suspensions. Aggregation contributes to fluid entrapment between solid particles and thus increases the effective participation of the rigid phase in the composite fluid. Methods are devel...
This work is a theoretical study on the effects of agglomeration on the fluidity and plasticity of a suspension of neutrally buoyant particles in a Newtonian fluid. The dynamics of a cluster of permanently attached spherical particles in a simple shear field is analyzed. The viscous and plastic components of the drag force acting on each of the agg...
This is a theoretical study on the effects of the network structure and deformation on the stress response of permanent elastomeric networks containing trapped entanglements and chain defects. In these systems, elastically active chains with both ends cross-linked coexist with segments that are tethered at one end only. It is assumed that under str...
Currently, the selection of elements and operating conditions in the mixing of various materials in a corotating twin screw extruder is an art which requires previous experimental studies. In this report, we outline various experimental and theoretical tools developed to investigate the mixing process in a fully intermeshing corotating twin screw e...
The architecture and entanglement density of a multicomponent polymer network composed of miscible, flexible chains is related to the corresponding properties and concentrations of the pure components. It is assumed that the coupling frequency between different chain species is proportional to their fractional participation in the blend and that th...
Currently, the selection of elements and operating conditions in the mixing of various materials in a co-rotating twin screw extruder is an art which requires previous experimental studies. In this report, we outline various experimental and theoretical tools developed to investigate the mixing process in a fully intermeshing co-rotating twin screw...
The thermorheological behavior of model heteropolymer blends are studied. Two linear polybutadienes, with variable microstructure, have been mixed at different relative concentrations. The glass transition temperature and the viscoelastic properties of the resulting systems have been measured experimentally and related to the blend composition. The...
The study of the effects of the molecular weight distribution on the mechanical properties of concentrated polymer solutions and melts is one of the central concerns of macromolecular rheology. This knowledge will help in optimizing the choices of material formulations, matching them to the particular processing and product needs. The present work...
Ph. D. (Chemical Engineering)--Northwestern University, 1985. Vita.