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Showing 1 to 20 of 35 for “"Cloud Point"”.
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Optimization of chemical enhanced oil recovery methods for naturally fractured carbonate reservoirs
… recovery in a fractured core. The viscosity and cloud point of the PEO were systematically investigated. The polymer concentration, temperature, salinity and hardness were varied, and several additives were added to potentially increase the range of conditions for which PEO could be applied to …
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New hydrogel forming thermo-responsive block copolymers of increasing structural complexity
… specific hydrophobic and hydrophilic end-groups. Cloud points (CP) of the polymers proved to be sensitive to all molecular variables studied, namely molar mass, nature and number of the end-groups, up to relatively high molar masses. Thus, by changing molecular parameters, CPs of the PMDEGA could …
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Design, Synthesis and Characterisation of Amphiphilic Symmetrical triblock copolymers by the RAFT process : their self-organisation in dilute and concentrated aqueous solutions
… and dynamic light scattering (DLS). The cloud point of the copolymers was nearly identical to the cloud point of the homopolymer and varied between 28-32 °C with concentrations from 0.01 to 50 wt%. This is attributed to the formation of micelles where the hydrophobic blocks are shielded …
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Chain-end functionalization and modification of polymers using modular chemical reactions
… yet bioinert and biocompatible with adjustable cloud point values (as it is the case in the present thesis), the whole generated system becomes "smart" and potentially applicable in different branches. The applications which were considered in the present thesis were in polymer …
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A method for the rapid, accurate prediction of the physical properties of middle distillate fuels from LC-¹H NMR derived data
… cetane index, density, specific gravity, pour point, flash point, viscosity, filterability, heat of combustion, cloud point, volume percent aromatics, residual carbon content, and initial, 10%, 50%, 90%, and end boiling points. These property predictions have accuracies approaching the error …
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Amphiphilic Poly(2-isopropyl-2-oxazoline)-block-poly(lactide) Nanoparticles as Drug Delivery Vehicles
… at the 30 °C, which corresponds to the cloud point of PiPOx-b-PDLLA in PBS solution. However, it remains unclear, whether the increased stability is due to the PEG-b-PDLLA mixing in the same micelles with PiPOx-b-PDLLA, thus hindering the aggregation of the nanoparticles upon the cloud …
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Characterization of palm olein (oil) as base oil for biolubricant production
… and chemical properties such as viscosity, flash point, pour point, cloud point, specific gravity, acid number, noack volatility and aniline point were analysed. The samples were degummed, neutralised and bleached to remove the red colour (carotene) and gummy materials. The bleached samples were …
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Stabilization of Submicron Metal Oxide Particles in Aqueous Media
… Finally, adsorption of PEOX was studied at the cloud point to determine whether insolubility could promote adsorption, while hydrogen-bonding, the room temperature driving force for adsorption, would decrease. Adsorption isotherm measurements were performed at 72 °C, and 75 °C, as the cloud …
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Studies of adsorption and stabilization of silica suspensions using well-defined polymeric dispersants
… were characterized by light scattering and cloud point measurements. The second virial coefficients in water were found to decrease with increasing temperature, reflecting lower critical solution behavior, which is consistent with the cloud point measurements. The temperature dependence of …
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Synthesis and characterization of stimuli-responsive microgels based on poly(glycidol)block copolymers
… of temperature sensitive microgels. Conjunction points have been successfully formed by UV irradiation of polymer water solution above cloud point. The influence of such parameters like block ratio, block length, amount of chromophore, concentration, irradiation time, temperature and heating rate …
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Towards greener stationary phases : thermoresponsive and carbonaceous chromatographic supports
… when heat is applied at a certain temperature (cloud point) in water are well-studied for this property in areas of separation chemistry, gene and drug delivery and as surface modifiers. One example of such a polymer is the poly (N-isopropylacrylamide) PNIPAAM, where it is dissolved well in …
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Application Of Method Developed For The Identification And Quantification Of Polar Components In Organic Liquid Products Of Selected Crop Oils And Deciphering The Mechanistic Aspects Of Cracking
… are corrosive and form wax-like crystals at a cloud point that would plug filters. However, short chain FAs have a high commercial value as byproducts of biofuel production. The understanding of mechanism of pyrolysis may reveal pathways for production of favorable products. These pathways are …
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Selection of Prediction Methods for Thermophysical Properties for Process Modeling and Product Design of Biodiesel Manufacturing
… namely, viscosity, cetane number, and flash point. Also, to ensure the operability of biodiesel in cold weather, one needs to quantitatively predict three low-temperature flow properties: cloud point (CP), pour point (PP), and cold filter plugging point (CFPP). This article presents the …
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Thermo-responsive Graft Copolymers based on Poly(Methyl Vinyl Ether): from Synthesis to Evaluation
… above a certain temperature, which is called the cloud point temperature (Tcp). This behaviour is based on the fact that the hydrophilic polymer/water interactions dominate at low temperatures, but are broken above the Tcp. Poly(methyl vinyl ether) (PMVE) was chosen for its thermo-responsive …
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Optimizing the structure and plasticization resistance of asymmetric polyimide hollow fiber membranes for CO2 removal from natural gas
… with the experimental results including cloud point experiments, SEM images, and the gas separation properties. In this study, a nodule structure model was developed based on the nucleation and growth and dual mode sorption model to gain a comprehensive understanding of the plasticization …
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Solubilization-emulsification processes in nonionic surfactant-water-liquid triglyceride systems
… ethoxylate surfactant, slightly below its cloud point, solubilization rate and capacity are much greater than those for comparable linear ethoxylates, and complete solubilization of oils rich in triolein is possible. Liquid triglycerides typically occur as mixtures with long chain polar …
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Vývoj inovativní prekoncentrační metody agar-pXRF pro mobilní analýzu rizikových prvků v životním prostředí
… (SPE), extrakce kapalina-kapalina (LLE) nebo cloud point extrakce (CPE). V praktické části mé dizertační práce se zabývám vývojem a optimalizací prekoncentrační techniky, která využívá přírodní polysacharid agar jako prekoncentrační medium. Po zachycení vybraných rizikových prvků v agaru je …
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Smart Hydrogels based on Responsive Star-Block Copolymers
… or architecture, i.e. arm number. However, the cloud point does strongly depend on pH, as it affects the overall charge of the star. For the second part we combined PDMA and PDEA to create double-responsive star-shaped block copolymers (DMA-DEA)x where both blocks are responsive to pH and …
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Performance and characteristics of controlled release matrices composed of hydroxpropylmethylcellulose and other polymers.
… characterized by U tube viscometry and their cloud points of gels. The properties of polymers and their mixture in matrices or in gels were investigated by differential scanning calorimetry (DSC). Compendial dissolution methodology was used to determine drug release from matrices and their …
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Development of Sustainable Thermoplastic Elastomers
… the Flory-Huggins interaction parameter through cloud point measurements on binary polymer blends and measurement of the ODT of the triblock copolymers. It was shown that the Flory-Huggins interaction parameter was independent of the length of the alkyl side-chain of the polyacrylates, in the …
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