Assessment of the Structure of Polysilicate Binding with Added Glycerol

2020 ◽  
Vol 987 ◽  
pp. 15-19 ◽  
Author(s):  
Valentina I. Loganina ◽  
Yerkebulan Bisengalievich Mazhitov ◽  
Yuri Petrovich Skachkov
Keyword(s):  
Ir Spectroscopy ◽  
Liquid Glass ◽  
Chemical Structure ◽  
Partial Replacement ◽  
Potassium Ions ◽  
Hydrogen Ions

The article presents the results of the study of the properties of the sol of silicate paint. The chemical structure of the polysilicate solutions obtained with the addition of glycerol was studied by IR spectroscopy. It is shown, that the interaction of potassium liquid glass and glycerol is weak and due to the partial replacement of hydrogen ions by potassium ions.

scholarly journals FT-IR-спектры многослойного графена и его композиции с поверхностно-активным веществом

2019 ◽  
Vol 126 (2) ◽  
pp. 177
Author(s):  
И.Ю. Денисюк ◽  
К.Ю. Логушкова ◽  
М.И. Фокина ◽  
М.В. Успенская
Keyword(s):  
Liquid Glass ◽  
Chemical Structure ◽  
Fourier Spectroscopy ◽  
Graphene Surface ◽  
Ir Fourier Spectroscopy ◽  
Ft Ir ◽  
Surface Active ◽  
Active Solvent

AbstractMultilayer graphene has been obtained by ultrasonic splitting of graphite microparticles in a surface-active solvent that is a mixture of nonane and water and a surface-active surfactant, which provides dispersion of graphene in hydrophilic systems, has been selected. The chemical structure of the obtained materials has been investigated by IR Fourier spectroscopy. Possible mechanisms of the influence of inorganic surfactants (sodium liquid glass) on the graphene, the type of relations that arise between it and the graphene surface, and possible areas of its application have been discussed.

scholarly journals Characterization of polydimethylsiloxane rubber upon photochemical, thermal, salt-fog ageings and exposure to acid vapours

e-Polymers ◽  
2006 ◽  
Vol 6 (1) ◽  
Author(s):  
F. Delor-Jestin ◽  
N. S. Tomer ◽  
R.P. Singh ◽  
J. Lacoste
Keyword(s):  
Ir Spectroscopy ◽  
Chemical Structure ◽  
Mesh Size ◽  
Cross Linking ◽  
Scanning Calorimetry ◽  
New Knowledge ◽  
Salt Fog ◽  
Complementary Analysis ◽  
Thermal Stability Of

AbstractThe changes in the chemical structure and the physical properties of a filled crosslinked polydimethylsiloxane rubber were monitored as a function of various ageing factors. The variables included photochemical, thermal, salt-fog ageings and exposure to acid vapours. Unaged and aged samples were studied by IR spectroscopy, hardness measurements, Differential Scanning Calorimetry (DSC) and thermogravimetric analysis (TGA) coupled with IR spectroscopy. No significant oxidation was detected after all ageings, except for nitric acid treatment. The presence of aluminium trihydrate was clearly identified as responsible for the observed chemical changes. Then an important vulnerability of this filled silicone rubber towards the cross-linking reactions provoked by usual ageings was also detected. The DSC-thermoporosimetry measurements of the mesh size distribution gave a comparison of cross-linking densities for each ageing. The complementary analysis with TGAIR allowed us to differenciate the thermal stability of the formulation after various ageings and to acquire new knowledge about thermal decomposition.

Jaundice in the Newborn

1982 ◽  
Vol 3 (10) ◽  
pp. 305-319
Author(s):  
M. Jeffrey Maisels
Keyword(s):  
Newborn Infant ◽  
Chemical Structure ◽  
Serum Bilirubin ◽  
Well Being ◽  
Hydrogen Ions ◽  
Bilirubin Concentration ◽  
Bilirubin Metabolism ◽  
Plasma Bilirubin ◽  
Intramolecular Hydrogen ◽  
Serum Bilirubin Concentration

Pediatricians are confronted daily with the problem of the jaundiced newborn infant. The newborn infant is unique because (a) some elevation of serum bilirubin concentration is found in virtually all babies in the first few days of life, (b) the serum bilirubin concentration frequently rises to levels that are almost never encountered outside of the neonatal period, and (c) the newborn period remains the only time in which an elevated plasma bilirubin concentration per se represents a threat to the well-being of the organism. FETAL AND NEONATAL BILIRUBIN METABOLISM Chemical Structure and Properties of Bilirubin Bilirubin IXα (so called because it is derived from cleavage at the α position of the heme ring of ferropro-toporphyrin IX) is the end product of the catabolism of heme, of which the major source is circulating hemoglobin. Recent observations on the stereochemistry and conformation of the bilirubin molecule are helpful in understanding the potential neurotoxicity of bilirubin as well as the mechanism of phototherapy.1 The isomer, bilirubin IXα(Z,Z), is the major form of bilirubin as it exists in the blood where it is tightly bound to albumin. When this form of bilirubin takes up two hydrogen ions, it forms bilirubin IXα(Z,Z) acid, which is an involuted structure containing intramolecular hydrogen bonds.

Exhaustive set of non-isomorphic sub-graphs and its application to chemical structure elucidation using a IR spectroscopy database

2000 ◽  
Vol 409 (1-2) ◽  
pp. 181-195 ◽  
Author(s):  
V.N. Piottukh-Peletsky ◽  
I.K. Korobeinicheva ◽  
T.F. Bogdanova ◽  
S.G. Molodtsov ◽  
B.G. Derendyaev
Keyword(s):  
Ir Spectroscopy ◽  
Structure Elucidation ◽  
Chemical Structure

scholarly journals THE RELATIONSHIP BETWEEN CHEMICAL STRUCTURE AND THE RESPONSE OF BLOWFLIES TO TARSAL STIMULATION BY ALIPHATIC ACIDS

1947 ◽  
Vol 30 (3) ◽  
pp. 255-262 ◽  
Author(s):  
L. E. Chadwick ◽  
V. G. Dethier
Keyword(s):  
Chemical Structure ◽  
Free Acid ◽  
Mineral Acid ◽  
Hydrogen Ion ◽  
Phormia Regina ◽  
Hydrogen Ions ◽  
Degree Of Dissociation ◽  
Rate Of Increase ◽  
Proboscis Extension ◽  
The Relationship

Using the technique of proboscis extension in antennectomized-labellectomized flies, the rejection thresholds of Phormia regina for 18 fatty acids and one mineral acid have been determined. The conclusions reached on the basis of these data may be summarized in the following terms: Tarsal stimulation by acids involves the summation of components from at least two sources. Of these the hydrogen ion is the most important. The other major factor is probably the anion rather than the undissociated acid. The stimulating power of the anions (or free acid molecules) increases with increasing chain length in both the mono- and dicarboxylic series, but the rate of increase decreases as the series is ascended. Acids containing 6 or more carbon atoms are not sufficiently soluble in 0.1 M sucrose to reach the threshold of rejection. Substitution of —H in the acyl grouping by —Cl, —OH, =O or —COOH, the presence of a C=C bond, or a shift from the trans- to the cis- configuration all diminish the effectiveness of the anion (or free acid). But since such alterations also augment the degree of dissociation and consequently the concentration of hydrogen ions, the net result is ordinarily a lowering of threshold in terms of the molar concentration required for rejection.

IR Spectroscopy of Polypropylene Fibrous Carrier before and after its Surface Modification with Metal Nanoparticles

2016 ◽  
Vol 683 ◽  
pp. 377-382
Author(s):  
Ilya A. Lysak ◽  
Galina V. Lysak ◽  
Tatyana D. Malinovskaya
Keyword(s):  
Ir Spectroscopy ◽  
Chemical Structure ◽  
Tin Dioxide ◽  
Helical Structure ◽  
Valence Vibration ◽  
Polypropylene Fibre ◽  
Metal Nanoparticle ◽  
Spectroscopy Study ◽  
Before And After ◽  
Polypropylene Melt

In this paper, we present an IR spectroscopy study of the molecular and supramolecular structure of the polypropylene fibre, used as a metal nanoparticle carrier, by the example of nanoparticles of tin dioxide. The aim of this work is to investigate the changes in the chemical structure of the polypropylene melt-blown web when modified with the tin dioxide nanoparticles. The paper shows that the metal-oxygen valence vibration bands appear in the IR spectra of modified polypropylene fibrous carriers. At the same time, the carrier material remains stereoregular and possess a helical structure.

scholarly journals Effect of New Eco-Polyols Based on PLA Waste on the Basic Properties of Rigid Polyurethane and Polyurethane/Polyisocyanurate Foams

2021 ◽  
Vol 22 (16) ◽  
pp. 8981 ◽  
Author(s):  
Marcin Borowicz ◽  
Marek Isbrandt ◽  
Joanna Paciorek-Sadowska
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
13C Nmr ◽  
Diethylene Glycol ◽  
Chemical Structure ◽  
Raw Materials ◽  
Acid Value ◽  
Spectroscopic Studies ◽  
Partial Replacement ◽  
Organometallic Catalyst

The aim of the presented research was to obtain two new eco-polyols based on waste polylactide (PLA) and to check the effect on the properties of rigid polyurethane (RPU) foams and, based on these, rigid polyurethane/polyisocyanurate (RPU/PIR) foams. The synthesis of eco-polyols was based on the transesterification reaction of melted PLA with diethylene glycol in the presence of an organometallic catalyst. Properties of the obtained eco-polyols were examined for their potential as raw materials for synthesis of rigid polyurethane and polyisocyanurate foams, i.e., hydroxyl value, acid value, density, viscosity, pH, water content. Spectroscopic studies (FTIR, 1H NMR and 13C NMR) were also carried out. Results of these tests confirmed the assumed chemical structure of the new polyols. RPU and RPU/PIR foam formulations were developed based on the obtained analytical results. Partial replacement of petrochemical polyol by eco-polyols in RPU and RPU/PIR foams decreased the value of apparent density, compressive strength, brittleness and water absorption. Moreover, all foams modified by eco-polyols showed higher resistance to aging. All RPU/PIR foams and most PRU foams modified by eco-polyols from waste PLA had better functional properties than the reference foams based on petrochemical polyol.

Graft Copolymerization of Acrylamide onto Polyester-Cotton Blended Fabric by Using Potassium Permanganate Redox System

2012 ◽  
Vol 627 ◽  
pp. 205-211
Author(s):  
Li Na Wang ◽  
Xian Lin Xu ◽  
Yuan Lin Ren ◽  
Xiao Yang Sui
Keyword(s):  
Electron Microscope ◽  
Reaction Time ◽  
Ir Spectroscopy ◽  
Potassium Permanganate ◽  
Chemical Structure ◽  
Graft Copolymerization ◽  
Redox System ◽  
Fire Performance ◽  
Rate Of Increase ◽  
Scanning Electron

The graft copolymerization of acrylamide onto polyester-cotton blended (PCB) fabric by using potassium permanganate (KMnO4) redox system was carried out. Effects of various parameters, such as concentration of monomer and initiator, reaction time and temperature on grafting were studied. The grafting percentage increased significantly with the increase of the concentration of acrylamide up to 1 mol/L and decreased after that. The graft yields increased steply with the increase of reaction time up to 3h and then increased progressively. The rate of grafting was also dependent on reaction temperature, it increased with the temperature up to 60°C, then the rate of increase gradually slowed down. The chemical structure of grafted surface of the PCB fabric was characterized by infrared (IR) spectroscopy and scanning electron microscope. The fire performance was investigated by the LOI and the vertical flammability tests, and the results indicate that the grafting treatment could improve the flame retardancy. Thermal behavior of grafted fabric samples was evaluated by Thermogravimetric (TG) and differential thermogravimetric (DTG).

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