-
- دوشنبه تا شنبه: 10:00 - 16:00 / یکشنبه تعطیل است
The chemistry, manufacture, dispersancy and utility of each class are described. The comparative functions, properties, thickening ability, dispersancy and degradation of VIIs are discussed. ... J.P.R. (1983) Degradation of polymers in multigrade lubricants by mechanical shear. Polym. Degrad. Stab. 5 425-447. Article CAS Google …
به خواندن ادامه دهید
Hydroclusters have long been reported responsible for shear thickening, in particular during reversible continuous shear thickening. These are clusters which stick together through liquid lubrication forces . However more recently friction in shear thickening has been understood necessary for the phenomenon to occur.
به خواندن ادامه دهید
These correlation studies enable prediction of performance of olefin copolymer in blended base oil based on an easily and quickly measurable intrinsic …
به خواندن ادامه دهید
We herein introduce a continuum model to predict the rheological behavior of shear-thickening polymer solutions using non-equilibrium thermodynamics that guarantees, by construction, consistency with the laws of thermodynamics as extended to handle non-equilibrium systems. This is made possible by using a scalar structural …
به خواندن ادامه دهید
Thickeners & quenching polymers Clariant is one of the world's leading suppliers of water-soluble polyalkylene glycols used as thickening agents for fire-resistant hydraulic fluids (HFC, HFC-E) and polymer quenchants.
به خواندن ادامه دهید
The introduction of a polymer into the composition of soap greases before the heat treatment stage with the subsequent formation of an isotropic melt helps in the …
به خواندن ادامه دهید
What is a Performance Polymer? PPs are a versatile class of polymers . with unique architecture that offer supe-rior thickening efficiencies, low trac-tion coefficients and high shear stabil-ity. Depending on the end use applica-tions, PPs can be used both as viscosity . Lowering the Temperature of Gear Oils . with Performance Polymer Technology
به خواندن ادامه دهید
Thickening Efficiency, and Traction Coefficient of Lubricants Pawan Panwar 1, Emily Schweissinger 2, Stefan Maier 2, Stefan Hilf 2, Sofia Sirak 2, and Ashlie Martini ... These studies demonstrate that there is a wide range of functionality and behavior of polymers in lubricant formula-tions. The structure and chemistry of the polymers vary ...
به خواندن ادامه دهید
Applying polymer prior to a thickening or dewatering process, or "conditioning", is often a requirement for the thickening or dewatering equipment to successfully operate. This operator fact sheet takes readers through the basics of polymers used in thickening and dewatering processes. You will learn about different types of polymer ...
به خواندن ادامه دهید
Understanding shear thickening in colloidal suspensions is of great practical importance. Hsu et al. create responsive polymer-coated silica particles whose rheology can be tuned in situ ...
به خواندن ادامه دهید
How do shear-thickening, energy-absorbing materials actually work? A simple explanation. Shear-thickening plastics are gels, with long-chain polymers suspended in a liquid lubricant that lets them flow smoothly past one another at slow speeds. Coax them slowly and the chains have plenty of time to slither about, like …
به خواندن ادامه دهید
In this white paper, we highlight a new and patented lubricant concept based on polymer technology. Originally developed and patented by SKF in response to specific problems …
به خواندن ادامه دهید
Thickening efficiency describes the amount of polymer that has to be used in a given lubricant formulation and is quantified as the polymer treat rate required to reach a desired viscosity. One definition …
به خواندن ادامه دهید
taken as the extent of interaction of the polymer with the base stock, greater the thickening property; greater is the extent of interaction[1]. Fuel economy may also be predicted by the thickening power of a lube oil additive. All the polymers were synthesized by following the method as reported earlier[2] and characterized on the basis
به خواندن ادامه دهید
After critical stress, lubrication breaks down, and frictional forces produce force chains, which generate the discontinuous shear thickening [38], [39]. Jamming transitions reshape the fluid-like particle systems into amorphous solids with finite yield stress when the particle packing fraction φ increases beyond a critical value, φJ [40] .
به خواندن ادامه دهید
1. Introduction. Shear thickening fluid (STF) is a non-Newtonian fluid that exhibits an abrupt increase in viscosity by a few orders of magnitude with increasing shear rate [1,2,3].STF behaves as a solid-like material under applied stress due to increasing viscosity, and when the loading is removed from the medium, the STF turns to the initial …
به خواندن ادامه دهید
Performing a complete rheological characterization of shear thickening fluid (STF) is of paramount importance from different perspectives. From the point of view of the formulation, rheology will help not only in the selection of the right particle shape and size, its concentration, the carrier fluid, etc., but also in the evaluation of the dispersing …
به خواندن ادامه دهید
The chemistry and structure of base oil and polymer additive molecules in lubricants directly affect key performance metrics such as viscosity index, thickening efficiency, and traction coefficient. However, the relationship between molecular properties and these metrics is still not fully understood, inhibiting the design of new fluids with ...
به خواندن ادامه دهید
bridging attractions [17]) may enhance shear thickening. Non-adsorbing polymers added to a colloidal sus-pension induce short-range depletion attractions, whose stresses can overwhelm thickening [14]. The polymer it-self may also alter suspension rheology. In lled poly-mers, the elasticity of the polymer medium can dramat-ically a ect N
به خواندن ادامه دهید
Food thickening agents are widely used to modify rheological and textural properties as well as to enhance the quality attributes. ... In starch polymers, individual glucose units are linked together by either α(1–4) or α(1–6) glycosidic bonds. Amylose is a linear polymer with α(1–4) linkages (and 2–5% α(1–6) bonds) and has a ...
به خواندن ادامه دهید
A multifunctional shear thickening gel (MSTG) with both shear thickening performance and magnetorheological effect was prepared by dispersing the carbonyl iron powder into shear stiffening polymer matrix.Upon varying the mass ratio of pyroboric acid to polydimethylsiloxane from 0 to 0.6, the relative shear thickening effect of MSTG first …
به خواندن ادامه دهید
Furthermore, their viscosity index is usually lower and polymer thickening agent was needed for practical application [10]. ... In summary, linear polymer-based liquid lubricants were designed by overcoming one's own shortcomings by learning from others' strong points with the main two synthetic lubricants, PAOs and synthetic esters. ...
به خواندن ادامه دهید
The repulsion interaction among PSt–EA particles was weakened by polymer layer. In addition, lubrication hydrodynamic interaction increased due to the adsorption of TX100. ... Ye L (2011) Shear-thickening behaviour of concentrated polymer dispersions under steady and oscillatory shear. J Mater Sci 46:339–346. Article CAS …
به خواندن ادامه دهید
The viscosity showed weak shear thickening at a volume fraction (φ) of 0.35, likely due to lubrication, and a strong continuous shear thickening (CST) at φ = 0.48, with a DST at φ = 0.52 due to the self-depletion attraction when considering the role of the hydrodynamic effective volume. 2.1.3. Friction contact theory
به خواندن ادامه دهید
The observation that the shear stability performance of polymers in terms of SSI (KV) as compared to SSI (HTHS) could be different, led to the comparing of the thickening. abilities of polymers (percent increase in …
به خواندن ادامه دهید
lubrication properties of shear-thickening (ST) fluids. In this work we carried out both ... in the case of polymer solutions a very good agreement was found between experiments and simulations if the lubricant was assumed to be Newtonian with a high shear viscosity [35]. Surprisingly, very little is known about the lubrication
به خواندن ادامه دهید
Thickening Efficiency, and Traction Coefficient of Lubricants Pawan Panwar 1, Emily Schweissinger 2, Stefan Maier 2, Stefan Hilf 2, Sofia Sirak 2, and Ashlie Martini ... Polymers in lubricants are used to serve range of purposes and perform their function through a variety of .
به خواندن ادامه دهید
Specifically, 0 < Q ≤ 1 indicates the thickening power of the polymer is less significant at high temperature, ... These VIIs represent the major families of polymers in lubricants that are used today. The Anton-Paar stabinger viscometer (Anton Paar , Graz, Austria), SVM 3000 model made in Anton Paar Company in Austria was used to …
به خواندن ادامه دهید
The chemistry and structure of base oil and polymer additive molecules in lubricants directly affect key performance metrics such as viscosity index, thickening efficiency, and traction coefficient.
به خواندن ادامه دهید