Effect of viscoelastic properties of a dispersion medium on the rheological behavior of a dilute suspension of dipolar dumbbells in a Rivlin-Ericksen fluid

1979 ◽  
Vol 15 (9) ◽  
pp. 873-876
Author(s):  
E. Yu. Taran
Keyword(s):  
Rheological Behavior ◽  
Viscoelastic Properties ◽  
Dispersion Medium ◽  
Dilute Suspension

Heterogeneous Blends of Polymers. Rheology and Morphology

1976 ◽  
Vol 49 (1) ◽  
pp. 93-104 ◽  
Author(s):  
G. N. Avgeropoulos ◽  
F. C. Weissert ◽  
P. H. Biddison ◽  
G. G. A. Böhm
Keyword(s):  
Shear Modulus ◽  
Rheological Behavior ◽  
Viscoelastic Properties ◽  
Practical Interest ◽  
Relative Importance ◽  
Network Parameters ◽  
Blend Morphology ◽  
Molecular Interpretation

Abstract A single polymer pair (BR and EPDM) was used to confirm experimentally rheology-morphology relationships that have been previously gleaned from comparison of a variety of blend systems. The relative importance of the primary factors which govern blend morphology (composition and relative mixing viscosity of the components) was determined over the range of practical interest. In addition, correlation of mixing rheology with more accurate and complete shear modulus data allowed (a) molecular interpretation of rheological behavior in terms of network parameters, such as physical entanglements, and (b) estimation of the elastic and loss components of the shear modulus during mixing. An attempt was made at explaining the dependence of blend morphology on the viscoelastic properties of the components in terms of a fracture or tearing mechanism.

scholarly journals Rheological behavior and antiarthritic activity of Pterodon pubescens nanoemulsion

2020 ◽  
Vol 9 (10) ◽  
pp. e179108119
Author(s):  
Paulo Roberto Nunes de Goes ◽  
Jaqueline Hoscheid ◽  
Saulo Euclides Silva-Filho ◽  
Diego Lacir Froehlich ◽  
Bruna Luíza Pelegrini ◽  
...  
Keyword(s):  
Rheological Behavior ◽  
Viscoelastic Properties ◽  
Elastic Characteristic ◽  
Cell Recruitment ◽  
Joint Cavity ◽  
Creep And Recovery ◽  
Inflammatory Agent ◽  
End Of Treatment ◽  
Different Doses

Pterodon pubescens, popularly known as "sucupira", it is traditionally used as anti-inflammatory agent. This work aimed to evaluate the in vivo antiarthritic properties of a P. pubescens oil nanoemulsion and the rheological behavior of the developed system. The viscoelastic properties, creep and recovery were evaluated by dynamic oscillatory tests. The antiarthritic activity of the nanoemulsion was evaluated by the zymozan-induced arthritis model, at three different doses (25, 50 and 125 mg/kg/day). P. pubescens oil nanoemulsion has been shown to decrease cell recruitment to a joint cavity and increased cartilaginous regeneration at the end of treatment of the dose of 50 mg/kg. The evaluation of the behaviour of deformation allowed to observe that the P. pubescens nanoemulsion presents predominantly elastic characteristic. These findings demonstrate the potential of P. pubescens and nanotechnology in the development of new antiarthritic drugs.

Enabling Applications of Covalent Adaptable Networks

2019 ◽  
Vol 10 (1) ◽  
pp. 175-198 ◽  
Author(s):  
Matthew K. McBride ◽  
Brady T. Worrell ◽  
Tobin Brown ◽  
Lewis M. Cox ◽  
Nancy Sowan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shape Memory ◽  
Rheological Behavior ◽  
Material Properties ◽  
Viscoelastic Properties ◽  
Shape Memory Polymers ◽  
Dynamic Reaction ◽  
Chemical Stimuli ◽  
Applied Fields ◽  
Covalent Crosslinks

The ability to behave in a fluidlike manner fundamentally separates thermoset and thermoplastic polymers. Bridging this divide, covalent adaptable networks (CANs) structurally resemble thermosets with permanent covalent crosslinks but are able to flow in a manner that resembles thermoplastic behavior only when a dynamic chemical reaction is active. As a consequence, the rheological behavior of CANs becomes intrinsically tied to the dynamic reaction kinetics and the stimuli that are used to trigger those, including temperature, light, and chemical stimuli, providing unprecedented control over viscoelastic properties. CANs represent a highly capable material that serves as a powerful tool to improve mechanical properties and processing in a wide variety of polymer applications, including composites, hydrogels, and shape-memory polymers. This review aims to highlight the enabling material properties of CANs and the applied fields where the CAN concept has been embraced.

Rheology of Ceramic Suspensions with Biopolymeric Gelling Additives

2006 ◽  
Vol 45 ◽  
pp. 462-470 ◽  
Author(s):  
Eva Gregorová ◽  
W. Pabst ◽  
Jiri Štĕtina
Keyword(s):  
Shear Rate ◽  
Rheological Behavior ◽  
Viscoelastic Properties ◽  
State Of The Art ◽  
Loss Modulus ◽  
Water Systems ◽  
Gel Casting ◽  
Rotational Viscometry ◽  
Ceramic Suspensions ◽  
Starch Consolidation

An overview is given of the rheological behavior of biopolymers in aqueous suspensions and of their role in new ceramic shaping processes (starch consolidation casting and carrageenan gel casting). In particular, we give a state-of-the-art account of the viscometric behavior, measured via rotational viscometry (apparent viscosity, including its shear-rate and concentration dependence), and the viscoelastic properties characterized via oscillatory shear rheometry (storage modulus, loss modulus and phase angle, including their temperature dependence), of starch-water systems, starchcontaining alumina suspensions, carrageenan-water systems and carrageenan-containing zirconia suspensions.

Viscoelastic Characterization of Microwave Drying Nature Rubber

2011 ◽  
Vol 291-294 ◽  
pp. 1344-1350
Author(s):  
Fu Quan Zhang ◽  
Yong Zhou Wang ◽  
Mei Chen ◽  
Mao Fang Huang
Keyword(s):  
Rheological Behavior ◽  
Viscoelastic Properties ◽  
Microwave Drying ◽  
Hot Air Drying ◽  
Air Drying ◽  
Hot Air ◽  
Drying Technology

Nature rubber (NR) is neither completely viscous nor elastic in nature, but viscoelastic in their properties. In the experiment, we used two types of equipments named rubber process analyzer (RPA) 2000 and mooney viscometer to characterize the viscoelastic properties of NR dried by microwave and hot-air, respectively. In present research, RPA tests on uncured NR dried by different methods were carried out using frequency and strain sweeps, and Mooney viscometer was detected using the big rotor at 100°C. The results showed that microwave drying has not influenced the viscoelastic properties of NR greatly, without changing the profiles of its rheological behavior. Compared with hot-air drying, the properties of NR dried by microwave improved significantly. As a new application, microwave drying technology offered an alternative way to the drying of NR.

Cement-free refractory concretes. Part 10. Rheological aspect of technology

2021 ◽  
pp. 18-33
Author(s):  
Yu. E. Pivinskii
Keyword(s):  
Rheological Properties ◽  
Concentration Dependence ◽  
Rheological Behavior ◽  
Dispersion Medium ◽  
Solid Phase ◽  
Dispersed Systems ◽  
Determining Factor

The features of the rheological behavior of CFRC matrix systems are considered as highly concentrated dispersed systems. They are characterized by a dilatative, thixotropic and thixotropic-dilatant nature of the flow, depending on the composition, concentration, dispersion, and a number of other factors. The equation of the concentration dependence of the viscosity of suspensions (Pivinskii equation) is proposed. It is shown that the determining factor is the content of a kinetically free dispersion medium in them. The effect of the content of grain aggregate on the rheological properties of foundry systems is characterized. The significant effect of polydispersity of the particles of the solid phase and the temperature on the rheological properties of the HCBS with the dilatant nature of the flow is shown. The data on the effect of defloculation and stabilization of matrix systems on their rheological properties, which determine the reeterological properties of molding systems to obtain CFRC. Ill. 13. Ref. 50. 

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