EVALUATION OF TECHNOLOGICAL PARAMETERS OF ASPHALT CONCRETE MIXTURES FOR THE STREET-ROAD NETWORK IN URBAN AGGROMERATIONS USING ADDITIVES OF POLYETHYLENE WITH LOW MOLECULAR WEIGHT

2021 ◽  
pp. 85-96
Author(s):  
Александр Борисович Соломенцев ◽  
Моиз Режист ◽  
Швендески Маселюс Жозеф
Keyword(s):  
Molecular Weight ◽  
Structure Formation ◽  
Dynamic Viscosity ◽  
Asphalt Concrete ◽  
Road Network ◽  
Low Molecular Weight ◽  
Polymer Additives ◽  
Polymer Additive ◽  
Technological Parameters ◽  
Concrete Mixtures

Получены значения динамической вязкости битумного вяжущего с добавками низкомолекулярного полиэтилена в температурном интервале 60…160 °С. При введении полимерных добавок в дорожный битум вязкость битума повышается. Наиболее высокие значения динамической вязкости наблюдаются у полимерной добавки Вискодор - ПВ1, это ярко выражено при расходе 4 % добавки от массы битума и при температурах ниже 130°С. Добавка неокисленного низкомолекулярного полиэтилена Honeyvell Titan 7205 увеличивает вязкость в большей степени, чем добавка окисленного полиэтилена Honeyvell Titan 7686. Определены допустимые технологические температуры асфальтобетонных смесей с полимерными добавками на этапах структурообразования асфальтобетона. We obtained the values of the dynamic viscosity of bitumen binder with additives of polyethylene with low molecular weight in the temperature range of 60…160 °C. When polymer additives are introduced into road bitumen, the viscosity of bitumen increases. The highest values of dynamic viscosity are observed for the polymer additive Viskodor - PV1, this is clearly pronounced at the consumption of 4 % of the additive based on the mass of bitumen and at temperatures below 130 °С. The additive of unoxidized low molecular weight polyethylene Honeyvell Titan 7205 increases the viscosity to a greater extent than the additive of oxidized polyethylene Honeyvell Titan 7686. We determined as well the permissible technological temperatures of asphalt concrete mixtures with polymer additives at the stages of structure formation of asphalt concrete.

Preparation of low-molecular-weight chitosan by enzymatic hydro-lysis for use in peliculture

2021 ◽  
pp. 31-33
Author(s):  
Элана Игоревна Ковалева ◽  
Марина Алексеевна Фролова ◽  
Алексей Иванович Албулов ◽  
Валерий Петрович Варламов ◽  
Анатолий Константинович Елисеев
Keyword(s):  
Molecular Weight ◽  
Enzymatic Hydrolysis ◽  
Environmental Factors ◽  
Low Molecular Weight ◽  
Technological Parameters ◽  
Low Molecular Weight Chitosan

Хитозан и его производные обладают множеством свойств, которые позволяют применять его в пчеловодстве. Он повышает устойчивость организма пчел к неблагоприятным факторам внешней среды и к возбудителям различных заболеваний. В результате проведенных исследований разработаны технологические параметры получения низкомолекулярного хитозана методом ферментативного гидролиза. Chitosan and its derivatives have many properties that allow them to be used in beekeeping. It increases the resistance of the bee organism to adverse environmental factors and to pathogens of various diseases. As a result of the conducted research, the technological parameters for the production of low-molecular-weight chitosan by enzymatic hydrolysis were developed.

scholarly journals ROAD BITUMEN WITH A MAN-MADE MODIFIER

Neft i gaz ◽  
2020 ◽  
Vol 3-4 (117-1118) ◽  
pp. 118-124
Author(s):  
N.K. ISHMUHAMEDOVA, ◽  
Keyword(s):  
Molecular Weight ◽  
Structure Formation ◽  
Elemental Sulfur ◽  
Oil And Gas ◽  
Raw Materials ◽  
Reaction System ◽  
Component Composition ◽  
Oil Field ◽  
Technological Parameters ◽  
Weight Growth

In this work, for the development of oil bitumens, the high-tar oil of the Karazhanbas field, which is economically unprofitable for processing, is used as an additive to the tar of a mixture of oils of Martyshi + Mangystau. As a modifying and plasticizing agent, a technogenic modifier – elemental sulfur (waste from the Tengiz oil and gas processing complex) was used, and various induction moments were introduced, which are an additional source of structure formation of the oxidized feedstock. The Karazhanbas oil field, although economically unprofitable for processing, is unique in its component composition. It contains a large number of high-molecular and resinous-asphaltene components (resins 24,18% and asphaltenes 4,85%) prone toassociative interactions and structure formation. Asphaltenes, in turn, are stabilizers of molecular weight growth, and, in general, make a significant contribution to improving the technological parameters of the target product-bitumen. The mechanism of action of elemental sulfur is that when dispersed with a reaction mixture, there is an increase in the release of acid gases, such as: H2S, CO, SO2, which is explained by an increase in the rates of polycondensation and compaction reactions. This increases the rate of reaction of bitumen sulphurization in the reaction system. Over time, the intensity of gas release decreases due to a gradual decrease in the rates and further cessation of compaction and polycondensation reactions. The structure of the bitumen stabilizes. Induction moments were used as an additional object of the structure builder. The creation of the induction factors increased the amount of reactive monocularity and bicyclogermacrene hydrocarbons (as confirmed by the indicators of instrumental analysis) that accelerate the formation of high molecular compounds, which leads to increased molecular weight of oxidizable starting material, thereby improving the technological parameters of the resulting bitumen. Technogenic sulfur and induction moments in tandem have a combined effect on the physical and mechanical characteristics of the developed bitumen. Summarizing the above results of experimental work, it should be noted that by choosing the calculated amount of raw materials, additives and varying various induction moments, you can get bitumen of the BN 80/120 brand, and this makes it possible to dispose of man-made waste, which is economically and environmentally appropriate.

scholarly journals Tailoring Molecular Weight of Polymer Additives for Organic Semiconductors

2022 ◽  
Author(s):  
Zhengran He ◽  
Ziyang Zhang ◽  
Sheng Bi
Keyword(s):  
Molecular Weight ◽  
Binary System ◽  
Organic Semiconductors ◽  
Organic Semiconductor ◽  
High Performance ◽  
Electronic Devices ◽  
Polymer Additives ◽  
Flexible Substrates ◽  
Polymer Additive

A binary system comprising both an organic semiconductor and a polymer additive has attracted extensive research interests due to great potential for high-performance, solution-proccessable electronic devices on flexible substrates. The...

scholarly journals Justification of bioactivated grain triticale use in alcohol production

2019 ◽  
Vol 48 (1) ◽  
pp. 57-65
Author(s):  
Анна Миронцева ◽  
Anna Mirontseva ◽  
Елена Цед ◽  
Elena Tsed ◽  
Светлана Волкова ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Chemical Composition ◽  
Ethyl Alcohol ◽  
Yeast Cells ◽  
Low Molecular Weight ◽  
Technological Parameters ◽  
Alcohol Production ◽  
Enzyme Preparations ◽  
Green Mass ◽  
Low Molecular Weight Compounds

Triticale accounts for the biggest share in gross processing and state procurement of grain in Belarussian production of alcohol. The main difficulty in its processing is the formation of viscous technological fluids due to the presence of non-starch polysaccharides in its chemical composition. All measures taken to solve the problem come down to the selection of the efficient enzyme preparations, hydrolyzing grain polymers into low molecular weight compounds, which have the ability to be disposed by the yeast cells and form the ethyl alcohol. But grain own enzymes are not involved. It is possible to solve the problem by means of biological activation, which will activate grain enzyme systems and partially hydrolyze grain polymers into low molecular weight compounds. The article considers general and special technological parameters of six cultivars of triticale selected in the Republic of Belarus: Antos, Kastus, Dubrava, Run, Prometheus, Impulse. The authors determined that the most promising cultivars for bioactivation and food grade ethyl alcohol production are Antos and Dubrava. The authors explored the possibility of using hot soaking of triticale grain for the biological activation. They also showed the advantages of introduction of amaranth green mass in the amount of 8% during hot soaking for the reduction of grain microbiological contamination. They studied the changes in the technological properties of triticale cultivars Antos and Dubrava after the bioactivation with the green mass of amaranth. The authors determined that grain microbiological characteristics improved, the activity of grain enzymes increased, proportion of low molecular weight compounds in the chemical composition increased. They studied the processes taking place during wort and mash production from the bioactivated triticale grain. The authors showed that the processing of bioactivated triticale grain resulted in the production of wort with higher concentration of dry matter which allowed to increase the ethanol content in the mature mash produced from triticale cultivar Antos by 19.5% and from the triticale cultivar Dubrava by 29.3% and reduce the total quantity of the main impurities in distillates.

Preparation of Telechelic Hydroxyl Low Molecular Weight Fluoropolymers

2017 ◽  
Vol 753 ◽  
pp. 93-98
Author(s):  
Dong Han Li ◽  
Ming Yi Liao
Keyword(s):  
Molecular Weight ◽  
Dynamic Viscosity ◽  
Lithium Aluminum Hydride ◽  
Raw Materials ◽  
Oxidative Degradation ◽  
Reaction Times ◽  
Aluminum Hydride ◽  
Reduction Reaction ◽  
Lithium Aluminum ◽  
Low Molecular Weight

Preparation of telechelic hydroxyl low molecular weight fluoropolymers by reduction reaction was presented. The telechelic carboxyl low molecular weight fluoropolymers were chosen as raw materials which were prepared by oxidative degradation method. The molecular weights of telechelic carboxyl low molecular weight fluoropolymers were about 3700. Then, using lithium aluminum hydride reacted with carboxyl groups to prepare the telechelic hydroxyl low molecular weight fluoropolymers. The effects of reaction temperatures, reaction times, contents of solvent and lithium aluminum hydride were investigated in detail. The structures, Mn and dynamic viscosity of low molecular weight fluoropolymers were analyzed by FTIR, 1H-NMR, GPC and viscometer respectively. Finally telechelic hydroxyl low molecular weight fluoropolymers were prepared. The conversion rate of that reduction reaction was about 95%. The product was a viscous fluid with a dynamic viscosity of 48Pa·s at 50°C.

scholarly journals ВЛИЯНИЕ ТЕХНОЛОГИЧЕСКОГО РЕЖИМА УСТАНОВКИ ТЕРМИЧЕСКОГО ПИРОЛИЗА УГЛЕВОДОРОДОВ НА КАЧЕСТВЕННЫЙ СОСТАВ ТЯЖЁЛОЙ СМОЛЫ

World Science ◽  
2019 ◽  
Vol 1 (1(41)) ◽  
pp. 29-35
Author(s):  
Садыгов Ф. М. ◽  
Магеррамова З. Ю. ◽  
Гаджиев Г. Н. ◽  
Гасан-заде Г. Г. ◽  
Мамедова И. Г. ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Maximum Yield ◽  
Optimum Process ◽  
Quantitative Composition ◽  
Process Conditions ◽  
Low Molecular Weight ◽  
Technological Parameters ◽  
Alkyl Derivatives ◽  
Liquid Products ◽  
Heavy Pyrolysis Resin

The dependence of the yield and composition of the heavy pyrolysis resin on the initial hydrocarbon feedstock and the process conditions is investigated. The variation of technological parameters within certain limits leads to a change in the content of low molecular weight olefins in the gaseous pyrolysis products, as well as the qualitative and quantitative composition of by-product liquid products. As a result of the research, the optimum process conditions for the pyrolysis of straight-run gasoline were determined, which, with the maximum conversion of hydrocarbons to low-molecular-weight olefins, significantly increases the yield of heavy resin containing a wide fraction of naphthalene, biphenyl, indene and their alkyl derivatives. It is shown that when treating by-products containing valuable hydrocarbons as target products and combining the technological mode of pyrolysis and their composition, it is possible to achieve along with the maximum yield of low molecular weight olefins, a significant yield of heavy pyrolysis resin and qualitative changes in its composition.

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