The interaction parameters of some rubber-solvent systems

1961 ◽  
Vol 26 (12) ◽  
pp. 3101-3108 ◽  
Author(s):  
B. Meissner ◽  
J. Janáček
Keyword(s):  
Interaction Parameters ◽  
Solvent Systems

scholarly journals Interaction Parameters of Poly(o-chlorostyrene)-Solvent Systems

1973 ◽  
Vol 46 (5) ◽  
pp. 1554-1556 ◽  
Author(s):  
Kunihiko Gekko ◽  
Kimiyoshi Matsumura
Keyword(s):  
Interaction Parameters ◽  
Solvent Systems

scholarly journals Determination of Binary Interaction Parameters for Ternary Polymer–Polymer–Solvent Systems Using Raman Spectroscopy

2020 ◽  
pp. 2000149
Author(s):  
Víctor‐Alfonso Gracia‐Medrano‐Bravo ◽  
Lisa Merklein ◽  
Nikolas Oberle ◽  
Manuel Batora ◽  
Philip Scharfer ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Interaction Parameters ◽  
Binary Interaction ◽  
Binary Interaction Parameters ◽  
Solvent Systems ◽  
Ternary Polymer ◽  
Polymer Solvent

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.

Hydrogen-Bonded Solvent Systems

1969 ◽  
Vol 67 (1_3) ◽  
pp. 168-168
Author(s):  
H. G. Hertz
Keyword(s):  
Solvent Systems ◽  
Hydrogen Bonded

VANILLINSÄURE ALS ENDPRODUKT DES STOFFWECHSELS VON ADRENALIN UND NORADRENALIN. II.

1963 ◽  
Vol 44 (1) ◽  
pp. 101-106 ◽  
Author(s):  
Wilhelm Dirscherl ◽  
Helmut Thomas
Keyword(s):  
Rat Liver ◽  
Paper Chromatography ◽  
Column Chromatography ◽  
Vanillic Acid ◽  
Hippuric Acid ◽  
Single Spot ◽  
Solvent Systems ◽  
Perfusion Experiment ◽  
Kinetics Of

ABSTRACT Perfusion of rat liver with vanillic acid yielded only one metabolite. In paper chromatography with three different solvent systems, the substance showed the same RF-values as vanillyolglycine (3-methoxy-4-hydroxyhippuric acid) and in mixed chromatograms there was only one single spot. After separation by column chromatography, the UV- and IRspectra of the reaction product were identical with those of 3-methoxy4-hydroxy-hippuric acid. During the perfusion experiment, the kinetics of the conjugation were investigated.

OPTIMIZATION OF THIN LAYER CHROMATOGRAPHY METHODS FOR SEPARATION AND IDENTIFICATION OF ANTIDEPRESSANTS IN THEIR MIXTURE

2014 ◽  
Vol 21 (1) ◽  
pp. 11-15
Author(s):  
Daiva Kazlauskienė ◽  
Guoda Kiliuvienė ◽  
Palma Nenortienė ◽  
Giedrė Kasparavičienė ◽  
Ieva Matukaitytė
Keyword(s):  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Solvent System ◽  
Ammonia Solution ◽  
Relative Standard ◽  
Rf Values ◽  
Solvent Systems ◽  
Paroxetine Hydrochloride ◽  
Fluvoxamine Maleate ◽  
Layer Chromatography

By conducting the toxicological analysis it is meaningful to determine the analytical system that could identify simultaneously several medicinal preparations quickly and precisely. The purpose of this work was to create and validate the method of thin-layer chromatography that would be suitable to separate the components of antidepressant mixture (amitriptyline hydrochloride, paroxetine hydrochloride, sertraline hydrochloride, fluvoxamine maleate and buspirone hydrochloride) and to identify them. The system was validated with regard to the sensitivity, repetition of data, resistance and particularity. The solvent systems with potential of high separation of components in their mixture were created: acetonitrile, methanol, ammonia solution 25 percent (85:10:5); acetonitrile, methanol, ammonia solution 25 percent (75:20:5); dichlormethane, 1,4-dioxane, ammonia solution 25 percent (50:45:5); dichlormethane, 1,4-dioxane, ammonia solution 25 percent (42:55:3); trichlormethane, 1,4-dioxane, ammonia solution 25 percent (25:70:5); trichlormethane, 1,4-dioxane, ammonia solution 25 percent (60:36:4). One of the most suitable solvent systems for separation of the analyzed mixture (sertraline, amitriptyline, paroxetine, buspirone, fluvoxamine) was determined – acetonitrile, methanol, ammonia solution 25 percent (85:10:5). When this solvent system was used, the average Rf values of the analyzed compounds differed the most. Validation was conducted – the relative standard deviation (RSD, percent) of the average Rf value of the analyzed compounds varied from 0,6 to 1,8 percent and did not exceed the permissible error of 5 percent. The sensitivity of methodology was determined by assessing the intensity of the mixture’s spots on the chromatographic plate. The detection limit of buspirone was 0,0012 µg; sertraline – 0,0008 µg; amitriptyline – 0,0004 µg; fluvoxamine – 0,0004 µg; paroxetine – 0,0008 µg. The resistance of results to the changed conditions – it was determined that when the amounts of the solvents acetonitrile and methanol were increased or decreased to two milliliters, the average Rf values of the analyzed compounds did not change statistically significantly

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