Chemically-modified polysulfones and their properties

2021 ◽  
pp. 24-33
Author(s):  
I. P. Storozhuk ◽  
◽  
V. M. Alekseev ◽  
A. N. Kalinnikov ◽  
A. S. Borodulin ◽  
...  
Keyword(s):  
Composite Materials ◽  
Block Copolymers ◽  
Heat Resistance ◽  
Chemically Modified ◽  
Heat Resistant ◽  
Methods Of Synthesis ◽  
Filled Composite

The review of works including works by the authors, concerning aromatic polysulfones chemically-modified on the main macrochain is presented. Methods of synthesis of copolymers and block-copolymers with increased heat-resistance by the use of new original compounds are described. Application availability of the modified polysulfones for production of heat-resistant filled composite materials is demonstrated.

scholarly journals POLYETHERIMIDE FOR CREATION OF HEAT-RESISTANT POLYMERIC COMPOSITE MATERIALS WITH HIGH PHYSICAL AND MECHANICAL PROPERTIES

2019 ◽  
pp. 94-100
Author(s):  
А. Бородулин ◽  
A. Borodulin ◽  
А. Калинников ◽  
A. Kalinnikov ◽  
С. Музыка ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Organic Solvents ◽  
Physical And Mechanical Properties ◽  
Polymeric Composite ◽  
Heat Resistant ◽  
Fine Organic Synthesis ◽  
The Subject ◽  
The Creation ◽  
Filled Composite

Thermoplastic and soluble in organic solvents polyetherimide is of great interest for the creation of heat-resistant composite materials with high physical and mechanical properties. In recent decades, the main scientific approaches to the synthesis of polyimides with the ability to process from melt and solutions in organic solvents have been developed. According to this methodology, the glass transition temperature of rigid-chain polyimides is reduced by increasing the flexibility of the main polymer chain and/or by reducing the intermolecular interaction. Evolution of fine organic synthesis is one of the priority directions of development of chemical technology. Chemistry of high-molecular compounds is the subject of research by various domestic and foreign scientists. This interest is due to the prospects for the use of materials for industrial purposes. The polyetherimide contains various aromatic, heterocyclic and cycloaliphatic groups and systems in its chain. This article describes the main approaches to the creation of polymers with improved, compared with polyimides, technological properties and prospects for their application in the production of filled composite materials based on them. The paper presents the properties of the materials under consideration as a justification for the creation of heat-resistant composite materials.

On corrosion properties of ceramic materials for pump friction pairs in lead – bismuth environment

2019 ◽  
pp. 116-122
Author(s):  
V. V. Stepanov ◽  
A. D. Kashtanov ◽  
S. U. Shchutsky ◽  
A. N. Agrinsky ◽  
N. I. Simonov
Keyword(s):  
Composite Materials ◽  
Heat Resistance ◽  
Experimental Research ◽  
Ceramic Materials ◽  
Operating Conditions ◽  
Metallic Materials ◽  
Corrosion Properties ◽  
Liquid Coolant ◽  
Radial Bearing ◽  
Axial Pump

We consider the results of studies on the choice of material of the lower radial bearing of the pump, designed to circulate the coolant lead – bismuth. The circulation of the liquid coolant is provided by a vertical axial pump having a “long” shaft. In this design it is necessary to provide for the lower bearing the lubrication carried out with lead – bismuth coolant. Having analyzed the operating conditions of the axial pump, we decided to carry out the lower bearing in accordance with the scheme of a hydrodynamic sliding bearing. The materials of friction pairs in such a bearing must withstand the stresses arising from the operation of the pump, as well as the aggressive conditions of the coolant. Non-metallic materials – ceramics and carbon-based composite materials – were selected basing on the study of literature data for experimental research on the corrosion and heat resistance in the lead-bismuth environment. 

scholarly journals Molecular Physiological Characterization of a High Heat Resistant Spore Forming Bacillus subtilis Food Isolate

2021 ◽  
Vol 9 (3) ◽  
pp. 667
Author(s):  
Zhiwei Tu ◽  
Peter Setlow ◽  
Stanley Brul ◽  
Gertjan Kramer
Keyword(s):  
Bacillus Subtilis ◽  
Heat Resistance ◽  
Dipicolinic Acid ◽  
Laboratory Strain ◽  
High Heat ◽  
High Heat Resistance ◽  
Vegetative Cells ◽  
Heat Resistant ◽  
Food Isolate ◽  
Wet Heat

Bacterial endospores (spores) are among the most resistant living forms on earth. Spores of Bacillus subtilis A163 show extremely high resistance to wet heat compared to spores of laboratory strains. In this study, we found that spores of B. subtilis A163 were indeed very wet heat resistant and released dipicolinic acid (DPA) very slowly during heat treatment. We also determined the proteome of vegetative cells and spores of B. subtilis A163 and the differences in these proteomes from those of the laboratory strain PY79, spores of which are much less heat resistant. This proteomic characterization identified 2011 proteins in spores and 1901 proteins in vegetative cells of B. subtilis A163. Surprisingly, spore morphogenic protein SpoVM had no homologs in B. subtilis A163. Comparing protein expression between these two strains uncovered 108 proteins that were differentially present in spores and 93 proteins differentially present in cells. In addition, five of the seven proteins on an operon in strain A163, which is thought to be primarily responsible for this strain’s spores high heat resistance, were also identified. These findings reveal proteomic differences of the two strains exhibiting different resistance to heat and form a basis for further mechanistic analysis of the high heat resistance of B. subtilis A163 spores.

SiO2 films as heat resistant layers for protection of expandable polystyrene foam from flame torch–induced heat

2017 ◽  
Vol 31 (5) ◽  
pp. 657-667 ◽  
Author(s):  
S Varnagiris ◽  
S Tuckute ◽  
M Lelis ◽  
D Milcius
Keyword(s):  
Heat Resistance ◽  
Photoelectron Spectroscopy ◽  
Silicon Oxide ◽  
Plasma Generator ◽  
Expanded Polystyrene ◽  
Spectroscopy Analysis ◽  
X Ray ◽  
Heat Resistant ◽  
Pulsed Dc ◽  
Gas Atmosphere

Currently, polymeric insulation materials are widely used for energy saving in buildings. Despite of all benefits, these materials are generally sensitive to heat and highly flammable. This work discusses possibility to improve heat resistance of expanded polystyrene (EPS) foam using thin silicon dioxide (SiO2) films deposited by magnetron sputtering technique. In order to increase surface energy and adherence of SiO2 thin films to substrate EPS was plasma pretreated before films’ depositions using pulsed DC plasma generator for 40 s in argon gas. SiO2 formation was done in reactive argon and oxygen gas atmosphere. Laboratory made equipment was used for flame torch–induced heat resistance experiments. Results showed that silicon oxide films remains stable during heat resistance experiments up to 5 s and fully protects polystyrene (PS) substrate. Films are relatively stable for 30 s and 60 s and partially protect PS from melting and ignition. Scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy analysis confirmed that SiO2 layer, which is distributed uniformly on the EPS surface, could work as a good heat resistant material.

A predictive model for particulate filled composite materials

1989 ◽  
Vol 24 (7) ◽  
pp. 2454-2460 ◽  
Author(s):  
F. J. Guild ◽  
R. J. Young
Keyword(s):  
Composite Materials ◽  
Predictive Model ◽  
Filled Composite

Characterization of the Structure in Highly Filled Composite Materials by Means of MRI

2002 ◽  
Vol 27 (3) ◽  
pp. 179 ◽  
Author(s):  
Joachim Götz ◽  
Norbert Eisenreich ◽  
Adam Geißler ◽  
Egon Geißler
Keyword(s):  
Composite Materials ◽  
Filled Composite

Efficient and Semiefficient Vulcanization Systems Employing 2-(Morpholinodithio)-Benzothiazole Generated in Situ

1977 ◽  
Vol 50 (1) ◽  
pp. 90-98
Author(s):  
J. P. Lawrence
Keyword(s):  
Heat Resistance ◽  
Experimental System ◽  
Heat Resistant ◽  
Molar Basis ◽  
Direct Replacement ◽  
Better Than

Abstract The MBTS-N-(morpholinothio)phthalimide vulcanization system has been found to be effective in producing heat resistant semi-EV and EV cures in a variety of representative rubbers. When used as a direct replacement on a molar basis for 2-(morpholinodithio)benzothiazole (MDB), improvements in processing safety were found in all cases studied. In this respect it is most effective in NR, SBR, and NBR. The experimental system also generally gave slower-curing stocks. The heat resistance of the experimental stocks was found to be equal to or better than that of the MDB control stocks. Substantial improvements in heat resistance for both SBR and IIR unexpectedly resulted from the use of the MBTS—imide system. This result suggests that the nature of the crosslinks formed by the two vulcanization systems are to some extent different in these two elastomers. This, in turn, may reflect upon the mechanisms of crosslink formation.

TECHNOLOGICAL WAYS TO CREATE COMPOSITE MATERIALS BASED ON HEAT-RESISTANT REFRACTORY COMPOUNDS (review)

2021 ◽  
pp. 12-20
Author(s):  
A.V. Shestakov ◽  
◽  
M.M. Karashaev ◽  
N.S. Dmitriev ◽  
◽  
...  
Keyword(s):  
Composite Materials ◽  
Powder Metallurgy ◽  
Thermomechanical Processing ◽  
Technological Plasticity ◽  
Heat Resistant ◽  
System A ◽  
Refractory Compounds ◽  
Similar Materials ◽  
Powder Metallurgy Methods ◽  
Rocket Technology

The article discusses the main technological approaches to obtain heat-resistant and heat-resistant materials based on compounds in the Ni–Al system in order to use them in promising products of aviation and rocket technology. It is shown that when receiving materials based on compounds in the Ni-Al system, a phase of eutectic origin is formed based on the Ni3Al compound, which reduces the technological plasticity of the alloys of this system. The use of powder metallurgy methods eliminates such phases in the structure of alloys obtained using granule metallurgy technology, as well as with the use of special methods of powder metallurgy. Technological approaches are presented to obtain similar materials using powder metallurgy methods combined with thermomechanical processing.

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