Probing the molecular design of hyper-branched aryl …
However, dendritic-like polymers (i.e. hyper-branched, dendrimers and linear polymers with dendritic side chains) as lubricant viscosity modifiers have not been described in the literature ...
Lowering the Temperature of Gear Oils with …
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
Effect of Polymer Structure and Chemistry on Viscosity Index
First, fluids with similar kinematic viscosities at 100 °C were formulated with five different polymers. Then, the simulation-calculated Newtonian viscosities at 40 and 100 °C, viscosity index, thickening efficiency, and traction coefficient in full film lubrication at 40 °C were validated by direct comparison to experimental data.
APPLICATIONS, TESTS, AND MEASURES
lubricant and to be economically efficient, it is preferable to limit the number of polymers needed to make a good lubricant [8]. Therefore, quantifying the effects of molecular weight, molecular weight distribution, and thickening efficiency are important. The thickening efficiency is defined by the amount of polymer needed
Core-Crosslinked Star Copolymers as Viscosity …
Thickening efficiency can be defined as the amount of polymeric additive that must be employed in a lubricant formulation to reach the desired kinematic viscosity at a given temperature, generally at 40 °C. As …
Type of the Paper (Article
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 .
Polymers | Free Full-Text | Shear Thickening Fluid and Its …
Your review is very comprehensive and provides a good overview of applications of shear thickening fluids. It is well-done concept of organization of the article with suitable sections of applications of STF like ballistic, damping, ad other purposes. ... [10] Ribeiro, M.P.; da Silveira, P.; de Oliveira Braga, F.; Monteiro, S.N. Fabric ...
Pharmaceutical Thickeners (Viscosity-Increasing …
Vinyl polymers . Vinyl polymers is a generic term given to high molecular weight synthetic polymers based on the vinyl groups: XCH=CHY. In the pharmaceutical field, the most important vinyl …
Sticky but Slick: Reducing Friction Using Associative and
Sustaining the current trend toward lower viscosity lubricants requires the development of improved friction modifier additives to compensate for the increased …
What are viscosity index improvers?
Viscosity index improvers are polymer additives that modify the viscosity variations of lubricants at high and low temperatures. For a better viscosity of lubricants ... A good viscosity index improver is characterized by a balance between efficient thickening and the stability of the polymer to shear stresses. What you should know: Polymers ...
Review of Viscosity Modifier Lubricant Additives
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 of thickening efficiency is the polymer treat rate to achieve a given kinematic viscosity at …
Viscosity & Viscosity Modifiers
• Viscosity modifiers in crankcase lubricants are polymers • VM's are used in most engine oils and many transmission fluids ... – Cost to achieve required thickening (Cost vs. TE) – Shear Thinning Properties – Low Temperature Properties • …
Viscosity Index Improvers and Thickeners | SpringerLink
The polymer concentration range described as being effective is similar to that described as being effective at controlling stray mist during mist lubrication . A long-term …
Thickeners & Viscosity Index Improvers | Afton Chemical
HiTEC ® 7389. Thickeners and viscosity index improvers are polymeric, and are added to reduce lubricant viscosity changes at high and low temperatures. Mineral oil lubricants …
Probing the molecular design of hyper-branched aryl …
This is achieved either by increasing the shear thickness (intermolecular interactions) of the polymer/oil blend and/or by a globular-to-coil transition (expansion) of …
Carbopol® Polymers
Carbopol® 691 polymer is a lightly crosslinked polyacrylic acid polymer powder polymerized in a toxicologically-preferred cosolvent system. This polymer provides suspension at low product viscosity and improves freeze-thaw and high temperature stability. This polymer performs well in challenging formulation environments at low and …
Composition, Properties, and Structure of Low-Temperature …
It is known that the disperse phase for polymer lubricants can cover a wide range of polymers, copolymers, ... At the first stage of the investigation the thickening power of the polypropylene in various dispersion media was investigated with a mass ratio of low- and high-molecular polymers of 60:40. Increase of the concentration of …
Design of linear polymer-based liquid lubricants by a …
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. ...
Thickening Agents
Ambergum™ 3021 water-soluble polymer by Ashland Specialty Chemical is a pigment dispersant, binder, solubilizer, liquid thickener, wetting & flow-control agent and protective colloid. It is a 30%...
Study of the influence of some polymeric additives as …
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 ...
Thickening mechanism of water-soluble polymer in the …
Hydrophobic-associated polymer is widely used as thickener in the presence of Ca2+ or Na+. Three polymers including partially hydrolyzed polyacrylamide (HPAM) and hydrophobically associating polymers (CHAP and CBHAP) were used to clarify the thickening mechanism. The fractal aggregation process, microstructure and …
Lubrizol Unveils First Sustainable and Biodegradable Carbopol
Carbopol® Fusion S-20 polymer is an inherently biodegradable rheology modifier that provides thickening, suspension and clarity similar to acrylates copolymer and is ideal for skin cleansing and hair care applications. It is also the first Carbopol® polymer to address all 12 Principles of Green Chemistry in its manufacturing process.
Core-Crosslinked Star Copolymers as Viscosity Index …
As polymer additives are one of the most expensive components of a lubricant formulation, it is highly desirable to develop additives with high thickening efficiency. Moreover, …
Viscosity Index Improvers and Thickeners
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. …
What is the thickener in lubricating grease?
The thickener in a lubricating grease is the component that sets grease apart from fluid lubricants. Thickeners are molecules, polymers, or particles that are partially soluble in lubricating fluid; they arrange themselves in such a way that they impart a semi-solid consistency to the grease. Many different types of chemical compounds can be ...
Effect of polymer structure and chemistry on viscosity index
The chemistry and structure of base oil and polymer additive molecules in lubricants directly affect key performance metrics such as viscosity index, thickening …
Asteric Viscosity Modifiers
OEMs, along with lubricant end-users are demanding higher performing, longer lasting and more fuel efficient lubricants. The call for fluids that work better under severe ... Greater thickening translates to lower polymer treat levels in the formulation. The VI increase, thickening and low temperature fluidity
Novethix HC220S polymer
It is suitable for thickening mild surfactant systems, dilutable concentrate systems as well as disinfectant cleaners containing cationic biocides. Novethix™ HC220S polymer is not compatible with lipase. Features and Benefits. Compatible with broad surfactant systems; Provides crystal clear systems; Synergistic thickening with electrolytes
Thin Film Lubrication, Lubricants and Additives
In this regime, the lubricant thickness is in the range from several to tens nanometres and consisting of three layers, namely, ... Polytetrafluoroethylene (PTFE) is …
Effect of Polymer Structure and Chemistry on Viscosity …
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 ...