scholarly journals Simple Rheological Analysis Method of Spinnable-Polymer Flow Properties Using MFI Tester

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Basel Younes
Keyword(s):  
Viscoelastic Properties ◽  
Current Method ◽  
Surface Shape ◽  
Processing Temperature ◽  
Analysis Method ◽  
Rheological Characterization ◽  
Rheological Analysis ◽  
Different Temperatures ◽  
The Right

Rheological characterization of polymers explains the flow behaviour and viscoelastic properties and tests fibre-forming ability. The current method investigates the viscoelastic properties and morphology of polymers and finds the rheological data and the right polymer viscosity, which is determining the best processing temperature. The right processing temperature saves the power, the material, and the time needed for production. After calculating polymers viscosity by using MFI tester, the method investigates rheological properties and surface shape at different temperatures and loads. The method could apply to other polymers to find the viscosity-temperature change and to set the best processing temperature.

Rheological Characterization of Body Lotions

2001 ◽  
Vol 11 (2) ◽  
pp. 83-88 ◽  
Author(s):  
Ming Long Yao ◽  
Jayesh C. Patel
Keyword(s):  
Thermal Stability ◽  
Temperature Sensitivity ◽  
Viscoelastic Properties ◽  
Rheological Characterization ◽  
Performance Properties ◽  
Rheological Measurements ◽  
End Use ◽  
And Storage

Abstract This study is attempted to demonstrate the application of rheological measurements in characterization of cosmetics products. As part of this study, several rheological tests were carried out on three common, commercially available body lotions to analyze their complex properties. The tests described in this study were simple and predictive in which the viscoelastic properties were successfully related with the end-use performance properties such as applicability, processing behavior, temperature sensitivity and storage and thermal stability.

scholarly journals Polyurethane-based scaffolds for myocardial tissue engineering

2014 ◽  
Vol 4 (1) ◽  
pp. 20130045 ◽  
Author(s):  
Valeria Chiono ◽  
Pamela Mozetic ◽  
Monica Boffito ◽  
Susanna Sartori ◽  
Emilia Gioffredi ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Bioactive Peptides ◽  
Myocardial Tissue ◽  
Processing Temperature ◽  
Rheological Characterization ◽  
Scanning Calorimetry ◽  
Rheological Analysis ◽  
Higher Temperature ◽  
Aided Design ◽  
Myocardial Tissue Engineering

Bi-layered scaffolds with a 0°/90° lay-down pattern were prepared by melt-extrusion additive manufacturing (AM) using a poly(ester urethane) (PU) synthesized from poly(ε-caprolactone) diol, 1,4-butandiisocyanate and l -lysine ethyl ester dihydrochloride chain extender. Rheological analysis and differential scanning calorimetry of the starting material showed that compression moulded PU films were in the molten state at a higher temperature than 155°C. The AM processing temperature was set at 155°C after verifying the absence of PU thermal degradation phenomena by isothermal thermogravimetry analysis and rheological characterization performed at 165°C. Scaffolds highly reproduced computer-aided design geometry and showed an elastomeric-like behaviour which is promising for applications in myocardial regeneration. PU scaffolds supported the adhesion and spreading of human cardiac progenitor cells (CPCs), whereas they did not stimulate CPC proliferation after 1–14 days culture time. In the future, scaffold surface functionalization with bioactive peptides/proteins will be performed to specifically guide CPC behaviour.

Rheological Idiosyncrasies of Elastomer/Clay Nanocomposites

2008 ◽  
Vol 18 (5) ◽  
pp. 54894-1-54894-10 ◽  
Author(s):  
Zoran Susteric ◽  
Tomaz Kos
Keyword(s):  
High Surface ◽  
Clay Nanocomposites ◽  
Rheological Characterization ◽  
Melt Mixing ◽  
Mixing Processes ◽  
Rheological Analysis ◽  
Clay Particles ◽  
Surface Areas ◽  
Montmorillonite Clays

Abstract Rheological properties of elastomeric nanocomposites with organically modified Montmorillonite clays, as possible replacements or supplements to classical active fillers, such as carbon black or silica, have been intensively studied in recent years. Possessing large specific surface areas acquired through the melt-mixing processes of elastomeric intercalation and subsequent filler exfoliation, the clay particles have indeed proved to be highly eligible reinforcing and thermally stabilizing ingredients for application in elastomers. In fact, their performance has shown to be in many respects superior to that of classical fillers, particularly owing to some unusual, though beneficial, exhibited properties. Namely, apart from uncommonly high surface activity, manifested by creation of a host of van der Waals type secondary linkages with elastomer molecules, the main curiosity of clay filler is its dissipative action. Using dynamic mechanical functions under different deformational and temperature conditions, as means for rheological characterization of nanocomposites, the foregoing nano-scale traits are clearly reflected in substantial stiffness at low strains and, unexpectedly, dwindling energy loss with increasig filler content and/or decreasing temperature. Besides, rheological analysis of this kind, together with appropriate theoretical grounds, has enabled elucidation of peculiar conduct, as well as macroscopic insight into the very nature of secondary interactions in elastomers.

Rheological Characterization of Drag-Reducing Cationic Surfactant Solution: Shear and Elongational Viscosities of Dilute Solutions

2003 ◽  
Author(s):  
Yasuo Kawaguchi ◽  
Jinjia Wei ◽  
Bo Yu ◽  
Ziping Feng
Keyword(s):  
Cationic Surfactant ◽  
Surfactant Solution ◽  
Model Parameters ◽  
Rheological Characterization ◽  
Giesekus Model ◽  
Turbulent Drag ◽  
Different Temperatures ◽  
Cetyltrimethyl Ammonium ◽  
Parameter Values

Shear viscosities of one kind of turbulent drag-reducing cationic surfactant solution, Cetyltrimethyl ammonium chloride (CTAC)/Sodium salicylate (NaSal) aqueous solution, were experimentally investigated by use of a stress controlled Reometer. The concentration and temperature of the solution ranged from 50 to 200 ppm and 20 to 40°C, respectively. The Giesekus model was found to fit the measured shear viscosities well for different temperatures and concentrations of the surfactant solution and the model parameter values obtained by fitting were correlated with temperature at certain solution concentrations. The temperature was found to have a large influence on the viscoelasticity of the surfactant solution. By using the model parameters obtained from the correlations, 70 percent of the measured shear viscosities agreed with the prediction by the Giesekus model within ±27.3 percent. The elongational viscosities of CTAC/NaSal surfactant solution were also experimentally investigated by use of an oppositing jet Reometer. The measured data were lower than the prediction by the Giesekus model.

scholarly journals Temperature-Dependent Rheological and Viscoelastic Investigation of a Poly(2-methyl-2-oxazoline)-b-poly(2-iso-butyl-2-oxazoline)-b-poly(2-methyl-2-oxazoline)-Based Thermogelling Hydrogel

2019 ◽  
Vol 10 (3) ◽  
pp. 36 ◽  
Author(s):  
Lübtow ◽  
Mrlik ◽  
Hahn ◽  
Altmann ◽  
Beudert ◽  
...  
Keyword(s):  
Viscoelastic Properties ◽  
Triblock Copolymer ◽  
Visual Observation ◽  
Synthesis And Characterization ◽  
Temperature Dependent ◽  
Aqueous Polymer ◽  
Different Temperatures ◽  
Aba Triblock Copolymer ◽  
Low Cytotoxicity

The synthesis and characterization of an ABA triblock copolymer based on hydrophilic poly(2-methyl-2-oxazoline) (pMeOx) blocks A and a modestly hydrophobic poly(2-iso-butyl-2-oxazoline) (piBuOx) block B is described. Aqueous polymer solutions were prepared at different concentrations (1–20 wt %) and their thermogelling capability using visual observation was investigated at different temperatures ranging from 5 to 80 °C. As only a 20 wt % solution was found to undergo thermogelation, this concentration was investigated in more detail regarding its temperature-dependent viscoelastic profile utilizing various modes (strain or temperature sweep). The prepared hydrogels from this particular ABA triblock copolymer have interesting rheological and viscoelastic properties, such as reversible thermogelling and shear thinning, and may be used as bioink, which was supported by its very low cytotoxicity and initial printing experiments using the hydrogels. However, the soft character and low yield stress of the gels do not allow real 3D printing at this point.

scholarly journals Rheological characterization of poly-dimethyl siloxane formulations with tunable viscoelastic properties

RSC Advances ◽  
2021 ◽  
Vol 11 (57) ◽  
pp. 35910-35917
Author(s):  
Thomas J. Petet ◽  
Halston E. Deal ◽  
Hanhsen S. Zhao ◽  
Amanda Y. He ◽  
Christina Tang ◽  
...  
Keyword(s):  
Viscoelastic Properties ◽  
Cellular Response ◽  
Polydimethyl Siloxane ◽  
Rheological Characterization ◽  
Dimethyl Siloxane ◽  
Storage And Loss Moduli

We have generated novel formulations of polydimethyl siloxane with varying viscoelastic properties that can be used to study cellular response. We present equations that can be used to predict the storage and loss moduli of these polymers.

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