Flow properties reveal the particle-to-polymer transition of ultra-low crosslinked microgels

Soft Matter ◽  
2020 ◽  
Vol 16 (3) ◽  
pp. 668-678 ◽  
Author(s):  
Andrea Scotti ◽  
Monia Brugnoni ◽  
Carlos G. Lopez ◽  
Steffen Bochenek ◽  
Jérôme J. Crassous ◽  
...  
Keyword(s):  
Viscoelastic Properties ◽  
Flexible Polymers ◽  
Flow Properties ◽  
Rigid Particles

Solutions of ultra-low crosslinked microgels show viscoelastic properties in between rigid particles and flexible polymers. The dominance of particle-like and polymer-like behavior depends on the concentration of microgel in solution.

Preparation, Characterization and Processing of PCL/PHO Blends by 3D Bioplotting

2020 ◽  
Vol 35 (5) ◽  
pp. 458-470
Author(s):  
S. Gopi ◽  
B. A. Ramsay ◽  
J. A. Ramsay ◽  
M. Kontopoulou
Keyword(s):  
Viscoelastic Properties ◽  
Biomedical Applications ◽  
Synergistic Effects ◽  
Thermal And Mechanical Properties ◽  
Flow Properties ◽  
Immiscible Blends ◽  
Melt Compounding ◽  
Linear Viscoelastic ◽  
Matrix Morphology ◽  
Good Flow

Abstract Blends of polycaprolactone (PCL) and poly(3-hydroxyoctanoate) P(3HO) were prepared by melt compounding. These immiscible blends exhibited droplet-matrix morphology at compositions up to 30 wt% P(3HO). Even though the addition of amorphous P(3HO) decreased the crystallinity of PCL, the crystallization temperature of the blends increased by 6 to 7 8C. Blends containing up to 30 wt% P(3HO) had higher crystallization rates, and lower crystallization half-times compared to neat PCL. The viscosity of PCL decreased upon addition of P(3HO), making the blends suitable for processing using a 3D bioplotter. Compositions with 10 to 30 wt% P(3HO) were ideal for processing, because of their improved crystallization kinetics, reduced stickiness and good flow properties. Estimation of the interfacial tension by fitting the Palierne model to the linear viscoelastic properties of the blends revealed good compatibility, which gave rise to synergistic effects in the thermal and mechanical properties. The fibres prepared by 3D bioplotting maintained droplet matrix morphology, with finer particle size than the original compounded material. In addition to favourable viscosity and thermal properties, the extruded fibres containing 30 wt% P(3HO) had comparable modulus to the neat PCL, while exhibiting good ductility. These blends may be suitable alternatives to PCL for biomedical applications, because they provide a range of crystallinities, crystallization rates and viscosities.

scholarly journals Studies on Flow Properties of Coating Colors. I. Interfacial and Viscoelastic Properties of Binder Latices.

1991 ◽  
Vol 45 (6) ◽  
pp. 685-693
Author(s):  
Yong-Kyu Lee ◽  
Fumihiko Onabe ◽  
Makoto Usuda ◽  
Kazuhiro Sato
Keyword(s):  
Viscoelastic Properties ◽  
Flow Properties

Relaxation spectra and viscoelastic properties of the binary linear flexible polymers

1988 ◽  
Vol 5 (2) ◽  
pp. 101-108
Author(s):  
Seok-Jeong Yoon ◽  
Kwang-Man Kim ◽  
Seong-Ihl Woo ◽  
In-Jae Chung
Keyword(s):  
Viscoelastic Properties ◽  
Flexible Polymers ◽  
Relaxation Spectra

Flow Properties for Several Kinds of Liquid Flows Through Micro-Orifices

2011 ◽  
Author(s):  
Akiomi Ushida ◽  
Tomiichi Hasegawa ◽  
Hiroshige Uchiyama ◽  
Takatsune Narumi
Keyword(s):  
Molecular Weight ◽  
Viscoelastic Properties ◽  
Elastic Stress ◽  
The Other ◽  
Polyethylene Glycols ◽  
Flow Properties ◽  
Pressure Drops ◽  
Surfactant Solutions ◽  
Elongational Flows ◽  
Liquid Flows

In this paper, the flow properties of several types of liquid passing through various sizes of micro-orifices were investigated. The jet thrust and pressure drops were measured for two polyethylene glycol solutions and four surfactant solutions. Different flow properties were found for the various surfactant solutions depending on the charge of the solute. For an anionic surfactant, the results were similar to those for water, whereas in the case of a cationic surfactant, both the jet thrust and pressure decreased greatly in comparison with the other test liquids. Finally, a nonionic surfactant exhibited a steep rise in the pressure drop at a particular value of the Reynolds number. In explaining this behavior, the liquid-solid interface and alignment of the surfactant molecules are considered, and consequently, it is strongly suggested that the elastic stress on elongational flows is a contributing factor. In addition, the decreases in pressure and thrust for polyethylene glycols are attributed to viscoelastic properties, regardless of the molecular weight of PEG.

Viscous fingering in non-Newtonian fluids

2002 ◽  
Vol 469 ◽  
pp. 237-256 ◽  
Author(s):  
ANKE LINDNER ◽  
DANIEL BONN ◽  
EUGENIA CORVERA POIRÉ ◽  
MARTINE BEN AMAR ◽  
JACQUES MEUNIER
Keyword(s):  
Polymer Solutions ◽  
Viscous Fingering ◽  
Taylor Instability ◽  
Newtonian Fluids ◽  
Flexible Polymers ◽  
Flow Properties ◽  
Newtonian Flow ◽  
Quantitative Investigation ◽  
Dilute Polymer Solutions ◽  
Strong Shear

We study the viscous fingering or Saffman–Taylor instability in two different dilute or semi-dilute polymer solutions. The different solutions exhibit only one non-Newtonian property, in the sense that other non-Newtonian effects can be neglected. The viscosity of solutions of stiff polymers has a strong shear rate dependence. Relative to Newtonian fluids, narrower fingers are found for rigid polymers. For solutions of flexible polymers, elastic effects such as normal stresses are dominant, whereas the shear viscosity is almost constant. Wider fingers are found in this case. We characterize the non-Newtonian flow properties of these polymer solutions completely, allowing for separate and quantitative investigation of the influence of the two most common non-Newtonian properties on the Saffman–Taylor instability. The effects of the non-Newtonian flow properties on the instability can in all cases be understood quantitatively by redefining the control parameter of the instability.

Physical and Hydrologic-Flow Properties of Fractures Las Vegas, Nevada—Zion Canyon, Utah—Grand Canyon, Arizona—Yucca Mountain, Nevada July 20–24, 1989

10.1029/ft385 ◽  
1989 ◽  
Author(s):  
Christopher C. Barton ◽  
Paul A. Hsieh ◽  
Jacques Angelier ◽  
Francoise Bergerat ◽  
Catherine Bouroz ◽  
...  
Keyword(s):  
Las Vegas ◽  
Grand Canyon ◽  
Yucca Mountain ◽  
Flow Properties

Flexible polymers in a nematic medium: a Monte Carlo simulation

1993 ◽  
Vol 3 (5) ◽  
pp. 603-609 ◽  
Author(s):  
J. H. van Vliet ◽  
M. C. Luyten ◽  
G. ten Brinke
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Flexible Polymers

Viscoelastic properties of a bent and straight dimeric liquid crystal

1993 ◽  
Vol 3 (5) ◽  
pp. 597-602 ◽  
Author(s):  
Gregory A. DiLisi ◽  
E. M. Terentjev ◽  
Anselm C. Griffin ◽  
Charles Rosenblatt
Keyword(s):  
Liquid Crystal ◽  
Viscoelastic Properties
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