Detection and Evaluation of Polymer-Polymer Interactions in Dilute Solutions of Associating Polymers

2021 ◽  
Author(s):  
Georges Pavlov ◽  
Anna Gosteva ◽  
Olga Okatova ◽  
Olga A. Dommes ◽  
Irina I. Gavrilova ◽  
...  
Keyword(s):  
Viscous Flow ◽  
Polymer Solutions ◽  
Hydrophobic Interactions ◽  
Dilute Solutions ◽  
Dilute Polymer Solutions ◽  
Experimental Tool ◽  
Solvent Systems ◽  
Polymer Interactions ◽  
Associating Polymers ◽  
Polymer Solvent

An experimental tool for the evaluation of intramolecular associative/hydrophobic interactions in polymer/solvent systems was proposed and tested. The method is based on measurements of viscous flow in dilute polymer solutions...

scholarly journals Definitions of terms relating to individual macromolecules, macromolecular assemblies, polymer solutions, and amorphous bulk polymers (IUPAC Recommendations 2014)

2015 ◽  
Vol 87 (1) ◽  
pp. 71-120 ◽  
Author(s):  
Robert Stepto ◽  
Taihyun Chang ◽  
Pavel Kratochvíl ◽  
Michael Hess ◽  
Kazuyuki Horie ◽  
...  
Keyword(s):  
Transport Properties ◽  
Polymer Solutions ◽  
Phase Behaviour ◽  
Dilute Solutions ◽  
Macromolecular Assemblies ◽  
Dilute Polymer Solutions ◽  
Bulk Polymers

AbstractThis document defines terms relating to the properties of individual macromolecules, macromolecular assemblies, polymer solutions, and amorphous bulk polymers. In the section on polymer solutions and amorphous bulk polymers, general and thermodynamic terms, dilute solutions, phase behaviour, transport properties, scattering methods, and separation methods are considered. The recommendations are a revision and expansion of the IUPAC terminology published in 1989 dealing with individual macromolecules, macromolecular assemblies, and dilute polymer solutions. New terms covering the principal theoretical and experimental developments that have occurred over the intervening years have been introduced. Polyelectrolytes are not included.

Polymer/Solvent Interaction Parameters

1966 ◽  
Vol 39 (1) ◽  
pp. 149-192 ◽  
Author(s):  
C. J. Sheehan ◽  
A. L. Bisio
Keyword(s):  
Polymer Solutions ◽  
Interaction Parameters ◽  
Semiempirical Methods ◽  
Heat Of Mixing ◽  
Solvent Interaction ◽  
Entropy Effects ◽  
Enthalpy And Entropy ◽  
Solvent Systems ◽  
Pronounced Deviation ◽  
Polymer Solvent

Abstract Solutions in which one of the components is a high polymer and the other component is a small-molecule solvent behave in a markedly different manner than do solutions of low molecular weight components. For example, the latter obey Raoult's law if the heat of mixing is negligible; however, many polymer solutions show pronounced deviation from ideality even at concentrations of one percent or less (Figures 1–7). These deviations are due to enthalpy and entropy effects which arise from large differences in size between solvent and solute molecules. Ability to predict the solubility characteristics of polymer/solvent systems, and to calculate values of the colligative properties of such systems, is important in engineering studies of polymer processes. This paper presents a compilation of data which can be used in conjunction with the Flory-Huggins theory of polymer solutions to predict properties of polymer solutions. A method is given for predicting polymer/solvent interaction parameters (μ) for systems for which experimental data are not available. Also included is a comparison between the proposed method and two other semiempirical methods for predicting μ.

Thermodynamics and acoustic effects of quercetin on micellization and interaction behaviour of CTAB in different hydroethanol solvent systems

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Vikrant Abbot ◽  
Poonam Sharma
Keyword(s):  
Pharmaceutical Industry ◽  
Hydrophobic Interactions ◽  
Chemical Properties ◽  
Formulation Development ◽  
Surfactant Interactions ◽  
Physico Chemical ◽  
Ultrasonic Sound ◽  
Apparent Molar Compressibility ◽  
Solvent Systems ◽  
Thermoacoustic Properties

AbstractFlavonoids amongst the class of secondary metabolites possess numerous health benefits, are known for its use in pharmaceutical industry. Quercetin, a flavonoid has more prominent medical advantages however its utilization is constrained because of various instability and insolubility issues and therefore, taken into consideration for studying its physico-chemical properties. In view of that, the thermodynamic and thermoacoustic properties of quercetin were examined in presence of cationic surfactant cetyltrimethylammonium bromide (CTAB) at different hydroethanolic concentrations and temperatures. The conductivity studies were used to calculate change in enthalpy (∆Hom), change in entropy (∆Som) and change in Gibbs free Energy (∆Gom) of micellization. The interactions between quercetin and CTAB were found to be endothermic, entropically controlled and spontaneous. Further, ultrasonic sound velocity and density studies were carried out and utilized for the calculation of thermoacoustic parameters i.e. apparent molar volume and apparent molar compressibility. Thermoacoustic properties revealed that at higher surfactant concentration, hydrophobic interactions are dominant. The results suggested that the flavonoid-surfactant interactions in hydroethanolic solutions is more favourable as compared with aqueous solution. Overall, the data is favourable for the framework to be used for detailing advancement, drug development, drug industry, pharmaceutical industry, medical administration and formulation development studies.

On the mechanism of drag reduction in dilute polymer solutions

1996 ◽  
Vol 55 (4) ◽  
pp. 289-295 ◽  
Author(s):  
K. Hoyer ◽  
A. Gyr ◽  
A. Tsinober
Keyword(s):  
Drag Reduction ◽  
Polymer Solutions ◽  
Dilute Polymer Solutions
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