scholarly journals Composition based on one-component polyurethane modified with tetrapropoxysilane

2021 ◽  
Vol 2131 (4) ◽  
pp. 042038
Author(s):  
M S Lisyatnikov ◽  
V Yu Chukhlanov ◽  
A V Korshakov
Keyword(s):  
Polymer Composition ◽  
Building Structures ◽  
Hydrophobic Properties ◽  
Hydrophobic Coating ◽  
Crosslinked Polymer ◽  
Natural Factors ◽  
Reactive Groups ◽  
Mechanism Of Interaction ◽  
Improved Performance ◽  
Contact Angle Of Wetting

Abstract The questions of interaction of one-component polyurethane and organosilicon compound from the group of alkoxysilanes - tetrapropoxysilane are considered. The composition is intended to obtain a hydrophobic coating with improved performance properties to protect building structures from the effects of technogenic and natural factors. The mechanisms of interaction of one-component polyurethane with tetrapropoxysilane have been studied using spectroscopy. The product of the interaction of the polymer and tetrapropoxysilane is a three-dimensionally crosslinked polymer in which polyurethane macromolecules are crosslinked by organosilicon molecules. The chemical reaction is based on the mechanism of interaction of isocyanate groups with reactive groups of alkoxysilane. The effect of the modifier on the surface structure of the cured coating was studied using a microscope. The contact angle of wetting of the modified and unmodified composition is determined, and the concentration of tetrapropoxysilane at which the coating acquires hydrophobic properties is determined. The effect of tetrapropoxysilane on the adhesive characteristics of the polymer composition has been studied. The change in the hardness of the composition at various concentrations of alkoxysilane was studied. Chemical modification of polyurethane allows you to vary its properties in the desired direction without deteriorating its other characteristics.

scholarly journals Mechanism of Interaction Between Hydrolytic Lignin and Poly(acrylonitrile)

2017 ◽  
Vol 19 (1) ◽  
pp. 23 ◽  
Author(s):  
Yu. Sazanov ◽  
S. Krutov ◽  
Y. Ipatova ◽  
D. Kosyakov ◽  
Ye. Kulikova
Keyword(s):  
Dimethyl Sulfoxide ◽  
Graft Copolymer ◽  
Carbon Materials ◽  
Binary Solution ◽  
Hydroxyl Groups ◽  
Fibrous Materials ◽  
Hydrolytic Lignin ◽  
Reactive Groups ◽  
Mechanism Of Interaction ◽  
Poly Acrylonitrile

Interaction between polyacrylonitrile (PAN) and hydrolytic lignin (THL) in mixed binary solution dimethyl sulfoxide/water (70:30) allowed us to obtain homogeneous forming solution of the THL/PAN composite. This forming solution was used for preparation of fibers and films which served as precursors for carbon materials. In the present work, we considered and substantiated the proposed mechanism of the formation of the THL/PAN composite based on the structure of the initial polymers. We believe that interaction between reactive groups present in PAN and THL leads to the formation of graft copolymer. Fundamentally, this reaction is possible and may proceed according to the wellknown Ritter mechanism It was demonstrated that the process of grafting nitrile groups to THL macromolecules is controlled by duration and temperature of interaction between the initial compounds in solution; this process is completed in 10 h at a temperature of 120 °C. Tentative calculation shows that for each statistically averaged PAN macromolecule there are five THL molecules with activated hydroxyl groups. These forming solutions are suitable for moulding fibers which serve as precursors for carbon fibrous materials.

scholarly journals OPTIMIZATION COMPOSITION OF THE WOOD-POLYMER COMPOSITION BASED ON POLYVINYLCHLORIDE

2020 ◽  
Vol 2020 (3) ◽  
pp. 33-37
Keyword(s):  
Polyvinyl Chloride ◽  
Fire Resistance ◽  
Polymer Composition ◽  
Performance Properties ◽  
Wood Polymer ◽  
Improved Performance

The objective of the reaserch is to elaboration the composition of a wood-polymer composition based on polyvinyl chloride with improved performance properties. The influence of the components of the composition - modifiers, lubricants, regulators and stabilizers - on the properties of the composition was researched. Optimization of the composition of wood-polymer composition based on PVC made it possible to obtain a material with higher strength and fire resistance.

Constructive Lazy Wolf Search Algorithm for Feature Selection in Classification

2019 ◽  
Vol 28 (05) ◽  
pp. 1950016
Author(s):  
H. Benjamin Fredrick David ◽  
A. Suruliandi ◽  
S. P. Raja
Keyword(s):  
Feature Selection ◽  
Search Algorithm ◽  
Search Time ◽  
Fine Tuning ◽  
Natural Factors ◽  
Benchmark Datasets ◽  
Database Technology ◽  
Hidden Patterns ◽  
Improved Performance ◽  
The Stability

Data mining integrates statistical analysis, machine learning and database technology to extract hidden patterns and relationships from data. The presence of irrelevant, redundant and inconsistent attributes in the data ushers poor classification accuracy. In this paper, a novel bio-inspired heuristic swarm optimization algorithm for feature selection, namely Constructive Lazy Wolf Search Algorithm is proposed based on the backbone of the Wolf Search Algorithm. It is based on the behavior of the real wolves, which search for their food and consequently survive the attacks of the threats by avoiding them. Based on the study conducted on the behavior of wolves two natural factors, namely laziness and health are introduced for attaining highest efficiency. Restricting and controlling the wolves’ behavior by allowing only healthy and constructive lazy wolves to take part in the search reduces the search time and complexity required to search for the best fitness. The proposed algorithm is then applied on a prisoner dataset for crime propensity prediction along with a few benchmark datasets to prove the stability in the improved performance compared with other bio-inspired optimization algorithms. The accuracy achieved by fine-tuning the proposed algorithm was 98.19% providing accurate crime prevention.

Super-Hydrophobic Coating Based on Acrylic Resin A01

2021 ◽  
Vol 316 ◽  
pp. 720-725
Author(s):  
Valentina I. Loganina
Keyword(s):  
Contact Angle ◽  
Surface Energy ◽  
Acrylic Resin ◽  
Properties Of Coatings ◽  
Hydrophobic Properties ◽  
Hydrophobic Coating

Information on the effect of organosilicon liquid on the hydrophobic properties of coatings, based on acrylic resin, is presented. It is shown that the value of the contact angle on the anti-icing coating is 151-154 degrees. When moistened for 72 hours, a decrease in the value of the contact angle, especially on the control coating, is 81-103 degrees. However, at the introduction of liquid 136-41, a decrease in the contact angle is insignificant. The surface energy of the coatings was calculated. It was found that the introduction of an organosilicon liquid in an acrylic composition increases the surface energy of the coatings.

scholarly journals Synthesis of Reactive Water-Soluble Narrow-Band-Gap Polymers for Post-Crosslinking

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 313
Author(s):  
Hao-xuan Guo ◽  
Takehiro Ohashi ◽  
Yusuke Imai ◽  
Hiroyuki Aota
Keyword(s):  
Band Gap ◽  
Narrow Band ◽  
Water Soluble ◽  
Polymer Chains ◽  
Crosslinking Reaction ◽  
Gravimetric Analysis ◽  
Crosslinked Polymer ◽  
Acid Sodium Salt ◽  
Reactive Groups ◽  
Sulfonic Acid Sodium Salt

In this study, water-soluble, narrow-band-gap polymers containing reactive groups were prepared by the addition-condensation of pyrrole (Pyr), benzaldehyde-2-sulfonic acid sodium salt (BS), and terephthalaldehydic acid (TPA) or p-hydroxybenzaldehyde (p-HB). TPA and p-HB were used for the post-crosslinking reaction between polymers. The polymers were characterized by employing various analyses such as 1H-NMR, thermal gravimetric analysis (TGA), and UV-Vis-NIR. The Eg values of polymers estimated from the absorption edges were 0.55 and 0.62 eV. The post-crosslinking reaction is important for preventing resolubilization and for developing an electron conducting route between the polymer chains. Herein, the post-crosslinked polymer was observed to maintain its narrow-band-gap and conductivity was increased 46 times compared to that observed before crosslinking.

scholarly journals Recovery wooden beams impregnating polymer composition based on epoxy resins

2015 ◽  
Vol 5 (3) ◽  
pp. 183-190
Author(s):  
Лукина ◽  
Anastasiya Lukina ◽  
Лукин ◽  
Mikhail Lukin ◽  
Рощина ◽  
...  
Keyword(s):  
Research And Development ◽  
Epoxy Resin ◽  
Numerical Experiments ◽  
Epoxy Resins ◽  
Polymer Composition ◽  
Building Structures ◽  
Program Complex ◽  
The Core ◽  
Wooden Structures ◽  
Objective Research

This paper proposes a method of restoration of wooden structures by impregnating polymer composition based on epoxy resin, locally weakened destruction. Objective - research and development of technology for site remediation of wooden structures with areas of locally de-graded wood. We analyzed the causes of the destruction of wooden building structures. The pa-per sets out the methodology and the engineering based on the example of a wooden beam, the destruction of locally weakened in the core zone. Engineering calculations were confirmed by numerical experiments carried out in the program complex "Lira 9.6".

scholarly journals A Mini-Review on Recent Developments in Anti-Icing Methods

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4149
Author(s):  
Adelya Kenzhebayeva ◽  
Baglan Bakbolat ◽  
Fail Sultanov ◽  
Chingis Daulbayev ◽  
Zulkhair Mansurov
Keyword(s):  
Ultrasonic Treatment ◽  
Road Traffic ◽  
Electric Heating ◽  
Air Travel ◽  
Building Structures ◽  
Hydrophobic Coating ◽  
Recent Advances ◽  
Recent Developments

An aggressive impact of the formed ice on the surface of man-made objects can ultimately lead to serious consequences in their work. When icing occurs, the quality and characteristics of equipment, instruments, and building structures deteriorate, which affects the durability of their use. Delays in the adoption of measures against icing endanger the safety of air travel and road traffic. Various methods have been developed to combat de-icing, such as mechanical de-icing, the use of salts, the application of a hydrophobic coating to the surfaces, ultrasonic treatment and electric heating. In this review, we summarize the recent advances in the field of anti-icing and analyze the role of various additives and their operating mechanisms.

scholarly journals REINFORCEMENT OF REINFORCED CONCRETE STRUCTURES WITH COMPOSITE MATERIALS

2021 ◽  
Vol 116 (1) ◽  
pp. 17-24
Author(s):  
Иван Бондарь ◽  
Салман Аль Дулайми ◽  
Алдекеева Динара ◽  
Токжан Куатбаева
Keyword(s):  
Large Scale ◽  
Water Resistance ◽  
Carbon Materials ◽  
Building Structures ◽  
Engineering Structures ◽  
Natural Factors ◽  
External Reinforcement ◽  
The Republic ◽  
Scale Grid

Recently, in the Republic of Kazakhstan, as well as in other countries of theAsian region, it is becoming more and more urgent to strengthen the operated reinforcedconcrete structures with external reinforcement systems with carbon materials during thereconstruction of any engineering structures. In order to eliminate the consequences of concretedestruction and reinforcement corrosion as a result of long-term exposure to natural factors andaggressive environments, carbon fiber external reinforcement systems are widely used during the operation of structures designed to repair and strengthen the load-bearing structures of artificialstructures. External reinforcement is used to increase the seismic resistance, strength andreliability of the structures being built, as well as to increase the time between repairs. The repairsystem provides for the use of materials and technologies that ensure stopping and preventingfurther corrosion of reinforcement and concrete, reliable adhesion of repair compounds with oldconcrete, increased water resistance, frost resistance and chemical resistance. This articledescribes FibARM carbon materials that are used to strengthen columns and pylons, broadbandreinforcement of slabs, beams, crossbars and structures with increased requirements forreinforcement joints, covering reinforcement of concrete with large-scale grid cracking.The mainmethods of strengthening the stretched and bent elements of building structures of artificialstructures are considered, and the technology of work on strengthening the structures of artificialstructures is also given.

Freeze-etch TEM of aqueous polymer gel network morphology

1986 ◽  
Vol 44 ◽  
pp. 796-797
Author(s):  
J. A. N. Zasadzinski ◽  
R. K. Prud'homme
Keyword(s):  
Metal Ion ◽  
Polymer Network ◽  
Polymer Gels ◽  
Polymer Gel ◽  
Deformation History ◽  
Crosslinked Polymer ◽  
Aqueous Polymer ◽  
History Of ◽  
Gel Network ◽  
Network Morphology

The rheological and mechanical properties of crosslinked polymer gels arise from the structure of the gel network. In turn, the structure of the gel network results from: thermodynamically determined interactions between the polymer chain segments, the interactions of the crosslinking metal ion with the polymer, and the deformation history of the network. Interpretations of mechanical and rheological measurements on polymer gels invariably begin with a conceptual model of,the microstructure of the gel network derived from polymer kinetic theory. In the present work, we use freeze-etch replication TEM to image the polymer network morphology of titanium crosslinked hydroxypropyl guars in an attempt to directly relate macroscopic phenomena with network structure.

The analysis of “Gels” in polymer films

1989 ◽  
Vol 47 ◽  
pp. 362-363
Author(s):  
G. M. Brown ◽  
D. F. Brown ◽  
J. H. Butler
Keyword(s):  
Molecular Weight ◽  
Film Industry ◽  
Local Stress ◽  
Melt Index ◽  
Polyethylene Films ◽  
Crosslinked Polymer ◽  
Polymeric Gels ◽  
Mineral Particles ◽  
Polymeric Species ◽  
Special Concern

The term “gel”, in the jargon of the plastics film industry, may refer to any inclusion that produces a visible artifact in a polymeric film. Although they can occur in any plastic product, gels are a principle concern in films where they detract from the cosmetic appearance of the product and may compromise its mechanical strength by acting as local stress concentrators. Many film gels are small spheres or ellipsoids less than one millimeter in diameter whereas other gels are fusiform-shaped and may reach several centimeters in length. The actual composition of gel inclusions may vary from miscellaneous inorganics (i.e. glass and mineral particles) and processing additives to heavily oxidized, charred or crosslinked polymer. The most commonly observed gels contain polymer differing from the bulk of the sample in its melt viscosity, density or molecular weight.Polymeric gels are a special concern in polyethylene films. Over the years and with the examination of a variety of these samples three predominant polymeric species have been observed: density gels which have different crystallinity than the film; melt-index gels in which the molecular weight is different than the film and crosslinked gels which are comprised of crosslinked polyethylene.

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