scholarly journals EPOXY-CONTAINING ADDUCTS OF ROSIN ASLIGHT- AND THERMOSTABILIZERS FOR PVC

2020 ◽  
Vol 18 (4) ◽  
pp. 457-463
Author(s):  
M.S. Pirguliyeva ◽  
◽  
А.М. Guliyev ◽  
Keyword(s):  
Thermal Stability ◽  
Polyvinyl Chloride ◽  
Polymer Matrix ◽  
Frost Resistance ◽  
Impact Resistance ◽  
High Thermal Stability ◽  
Processing Temperature ◽  
Light Radiation ◽  
Epoxy Derivative ◽  
Derivatives Of

The thermo- and light-stabilizing activity of glycidyloxycarbonyl- and glycidyloxymethylsubstituted derivatives of the sulphur-containing rosin in the compositions on the basis of plasticized polyvinyl chloride were studied. It found that the proposed epoxy-derivative adducts of rosin possess thermal stability allowing them to withstand the processing temperature of polyvinyl chloride compositions. The developments showed that the proposed stabilizers can protect the polymer matrix against light radiation. It revealed that the film samples prepared with the help of the proposed stabilizers showed the high thermal stability, impact resistance, good frost resistance and mechanical strength.

Thermal stability, mechanical properties, and gamma radiation shielding performance of polyvinyl chloride/Pb(NO3)2 composites

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Sayed A. Waly ◽  
Ahmed M. Abdelreheem ◽  
Mohamed M. Shehata ◽  
Omayma A. Ghazy ◽  
Zakaria I. Ali
Keyword(s):  
Thermal Stability ◽  
Attenuation Coefficient ◽  
Polyvinyl Chloride ◽  
Polymer Matrix ◽  
Composite Films ◽  
Mass Attenuation Coefficient ◽  
Radiation Shielding ◽  
Point Sources ◽  
Linear Attenuation Coefficient ◽  
Mass Attenuation

Abstract Radiation shielding composites based on polyvinyl chloride (PVC) reinforced with different weight ratios of Pb(NO3)2 (5, 10, and 20 wt%) were prepared using the solution-casting technique. Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy, and tensile testing method were used to characterize the PVC composite films. FTIR and XRD investigations illustrate the structural change and modification of the as-prepared PVC composites. The morphological analysis of the composite revealed that Pb(NO3)2 was dispersed uniformly within PVC polymer matrix. TGA revealed that the incorporation of Pb(NO3)2 improved the thermal stability of the investigated composites, whereas adding Pb(NO3)2 to the polymer matrix worsened its tensile properties. The as-prepared composite films were investigated for radiation-shielding of gamma-rays radioactive point sources (241Am, 133Ba, 137Cs, and 60Co). Linear attenuation coefficient (μ, cm−1), mass attenuation coefficient (μ/ρ, cm2/g), and half-value layer (HVL, cm) have been estimated from the obtained data using the MicroShield program. Reasonable agreement was attended between theoretical and experimental results. The deviation between the experiment and theoretical values of mass attenuation coefficient is being to be lower than 9%, and this can be correlated to the good distribution of Pb(NO3)2. The results revealed that adding Pb(NO3)2 to PVC polymer composites improved their mass attenuation coefficient.

Preformed particle gels for enhanced oil recovery

2020 ◽  
Vol 34 (28) ◽  
pp. 2050260
Author(s):  
B. A. Suleimanov ◽  
E. F. Veliyev ◽  
N. V. Naghiyeva
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Polymer Matrix ◽  
Oil Recovery ◽  
Sulfonic Acid ◽  
Bentonite Clay ◽  
High Thermal Stability ◽  
Ammonium Persulphate ◽  
Hydrophilic Interactions ◽  
Preformed Particle Gels

This study refers to the synthesis of new advanced preformed particle gels (PPGs) based on 2-acrylamido-2-methylpropane sulfonic acid (AMPS), Polyvinyl Pirrolidone (PVP) and bentonite clay. For the synthesis, [Formula: see text], [Formula: see text]-methylenebisacrylamide was used as crosslinker and ammonium persulphate as initiator. As a consequence of the inclusion of clay into the polymer matrix and the intercalation of AMPS between the layers as well as the presence of hydrophilic interactions occurring between partners, the final PPGs possessed greater swelling degrees, slower de-swelling process, high thermal stability and enhanced mechanical properties in comparison with pure PPG.

Preparation and properties of polyurethane foams from hydroxypropoxy derivatives of urea and isocyanates

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Iwona Zarzyka-Niemiec ◽  
Katarzyna Rydel
Keyword(s):  
Thermal Stability ◽  
Propylene Carbonate ◽  
Water Uptake ◽  
Polyurethane Foams ◽  
High Thermal Stability ◽  
Diphenylmethane Diisocyanate ◽  
Rigid Polyurethane Foams ◽  
Molar Excess ◽  
Derivatives Of

AbstractThe products of hydroxyalkylation of N,N’-bis(2-hydroxypropyl)urea (BHPU) with large molar excess of propylene carbonate (PC) posses enhanced thermal stability. These products and 4,4’-diphenylmethane diisocyanate were used as substrates for obtaining rigid polyurethane foams, which had high thermal stability and low water uptake.

New Mixed-Ligand Metal-Containing Monomer Based on Cobalt Acrylate and 4-Phenyl-2,2':6',2″-Terpyridine Ligand: Synthesis, Characteristics and Thermal Properties

2021 ◽  
Vol 899 ◽  
pp. 37-44
Author(s):  
Evgeny S. Sorin ◽  
Rose K. Baimuratova ◽  
Dmitry A. Chernyayev ◽  
Denis V. Korchagin ◽  
Igor E. Uflyand ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Polymer Matrix ◽  
Analytical Techniques ◽  
Thermal Polymerization ◽  
High Thermal Stability ◽  
Mixed Ligand ◽  
Dsc Analysis ◽  
X Ray ◽  
Vis Spectroscopy

New complex based on cobalt (II) acrylate and 4′-phenyl-2,2′:6′,2″-terpyridine (PhTpy) was synthesized and characterized using a number of analytical techniques including IR and UV- vis spectroscopy, elemental, X-Ray and TGA/DSC analysis. The complex has high thermal stability and crystallinity. It is found that decomposition of the complex is accompanied by thermal polymerization of acrylic fragments that is a potential way for the preparation nanoparticles of metals or their oxides stabilized by the polymer matrix.

Complex Stabilizer Based on Calcium and Zinc Stearates for PVC Compounds

2020 ◽  
Vol 869 ◽  
pp. 218-223
Author(s):  
Timur A. Borukaev ◽  
Luiza I. Kitieva ◽  
Zakhirat Kh. Sultigova ◽  
Rukhsara M. Martazova
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Polyvinyl Chloride ◽  
Polymer Matrix ◽  
Elevated Temperatures ◽  
Destructive Processes ◽  
Thermal Stability Of

Compounds based on polyvinylchloride plasticate containing a complex stabilizer based on salts of calcium and zinc stearates were obtained. The thermal properties of the obtained compounds are investigated. It was found that the introduction of a complex stabilizer in PVC compound leads to increased thermal stability of the compound. It is shown that the complex stabilizer affects the destructive processes that occur in the polymer matrix at elevated temperatures. It was found that the introduction of a complex stabilizer based on a mixture of calcium and zinc stearates in polyvinyl chloride plastics results in materials with improved processability.

Wide-bandgap bipolar material with high thermal stability

2019 ◽  
pp. 903
Author(s):  
Sheng-Chieh Lin ◽  
Yu-Chieh Cheng ◽  
Man-Kit Leung ◽  
Jiun-Haw Lee ◽  
Tien-Lung Chiu
Keyword(s):  
Thermal Stability ◽  
Wide Bandgap ◽  
High Thermal Stability

Effect of the hydrophilicity of the polymer matrix on immobilized α-chymotrypsin

1984 ◽  
Vol 49 (6) ◽  
pp. 1552-1556
Author(s):  
Minoru Kumakura ◽  
Isso Kaetsu
Keyword(s):  
Thermal Stability ◽  
Enzyme Activity ◽  
Pore Size ◽  
Polymer Matrix ◽  
Low Temperatures ◽  
Radiation Polymerization ◽  
Thermal Stability Of

α-Chymotrypsin was immobilized by radiation polymerization at low temperatures and the effect of the hydrophilicity of the polymer matrix on the enzyme activity and thermal stability was studied. The activity and thermal stability of immobilized chymotrypsin increased with the increasing hydrophilicity of the polymer matrix or monomer. The thermal stability was affected by the form and pore size of the polymer matrix; chymotrypsin immobilized on a soft-gel polymer matrix exhibited an enhanced thermal stability.

New Deep Blue Emitting Materials Based on Indenopyrazine Core with High Thermal Stability

2011 ◽  
Vol 11 (5) ◽  
pp. 4639-4643 ◽  
Author(s):  
Chang-Hun Seok ◽  
Young-Il Park ◽  
Soo-Kang Kim ◽  
Ji-Hoon Lee ◽  
Jongwook Park
Keyword(s):  
Thermal Stability ◽  
High Thermal Stability ◽  
Deep Blue

scholarly journals Improved thermally stable oligoetherols from 6-aminouracil, ethylene carbonate and boric acid

2019 ◽  
Vol 17 (1) ◽  
pp. 1080-1086
Author(s):  
Elżbieta Chmiel-Szukiewicz
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Boric Acid ◽  
Ethylene Carbonate ◽  
Pyrimidine Ring ◽  
Polyurethane Foams ◽  
High Thermal Stability ◽  
H Nmr ◽  
Maldi Tof ◽  
Instrumental Methods

AbstractSyntheses of oligoetherols with a 1,3-pyrimidine ring and boron atoms using 6-aminouracil, ethylene carbonate and boric acid has been proposed. The structure of the obtained products were determined by instrumental methods (IR, 1H-NMR and MALDI-ToF spectra). The physicochemical and thermal properties of oligoetherols were examined. The products were characterized by high thermal stability. Based on the tests performed, it was found that oligoetherols obtained from 6-aminouracil, boric acid and ethylene carbonate are suitable for the manufacturing of polyurethane foams with improved thermal stability and reduced flammability.

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