Copolymerization of 1,3-butadiene and styrene under the action of n-butyllithium in the presence of an amine-containing modifier in hexane

Vagizov, A.M.; Khusainova, G. R.; Akhmetov, I.G.; Сахабутдинов, А. Г.

doi:10.1134/s1070427216010201

Cited by 5 publications

(3 citation statements)

References 2 publications

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“…Subsequently, as the monomer conversion increases, the values of the mass fraction of bound styrene converge. The higher reactivity of styrene in the presence of AMD was shown earlier [6], where the calculated copolymerisation constants of 1,3-butadiene (r 1 ) and styrene (r 2 ) amounted to 0.99 and 2.43 (according to the Mayo-Lewis method) and to 0.97 and 2.12 (according to the Feynman-Ross method) respectively.…”

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confidence: 62%

The Influence of Temperature on the Copolymerisation of 1,3-butadiene and Styrene using a Modified Lithium-containing Initiating System

Vagizov

Khusainova

Akhmetov

et al. 2017

International Polymer Science and Technology

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The relationships governing 1,3-butadiene copolymerisation in a hexane solvent in the temperature range 30-70°C were studied. The copolymerisation process was initiated by n-butyllithium. A mixture of alkali metal and alkaline earth metal amine-containing alcoholates (AMD) was used as the modifier. The microstructure and macrostructure of the obtained p-SBR specimens were investigated. In p-SBR specimens obtained in the presence of AMD in the investigated temperature range, the distribution of styrene units in block was not found. The introduction of AMD leads to the disappearance of the induction period and to an increase in the copolymerisation rate, i.e. the reactivity of the system increases, and a reduction in temperature accelerates this process. It was shown that, with increase in the process temperature, there is a reduction in the average molecular weights of the copolymer. In the presence of AMD, lowering of the copolymerisation temperature leads to 'enrichment' of the butadiene part in 1,2-units (up to 66.3%).

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confidence: 62%

The Influence of Temperature on the Copolymerisation of 1,3-butadiene and Styrene using a Modified Lithium-containing Initiating System

Vagizov

Khusainova

Akhmetov

et al. 2017

International Polymer Science and Technology

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“…Vagizov et al [6] investigated the copolymerisation of 1,3-butadiene and styrene in the presence of n-butyllithium (NBL) and a mixture of amine-containing alcoholates of alkali and alkaline-earth metals (AMD) in a hexane solvent, in the course of which it was established that the AMD/NBL molar ratio has a considerable influence on the rate of the process and on the molecular structural characteristics of the copolymer. This work is a continuation Kauchuk i Rezina, No.…”

Section: The Influence Of the Concentration Of An Initiating System Cmentioning

confidence: 99%

The Influence of the Concentration of an ‘n-butyllithium–amine-containing Modifier’ Initiating System on the Copolymerisation of 1,3-butadiene and Styrene

Vagizov

Khusainova

Akhmetov

et al. 2017

International Polymer Science and Technology

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The influence of the concentration of an initiating system consisting of n-butyllithium and an amine-containing modifier on the copolymerisation of 1,3-butadiene and styrene in a hexane solvent was studied. The molecular characteristics and the microstructure of specimens of the obtained solution-polymerised styrene butadiene rubber (s-SBR) were determined by gel permeation chromatography on a Breeze liquid chromatograph (Waters) and by IR spectroscopy on a Spectrum GX 100 spectrometer (PerkinElmer) in accordance with ISO 21561/2. It was shown that a reduction in the amount of the initiating system is accompanied with a reduction in the copolymerisation rate and in the monomer conversion, and also with an increase in the average molecular weights of the copolymer. It was established that a reduction in the initiating system concentration in the reaction medium leads to a reduction in the content of 1,2-units in the rubber. A comparative analysis of data for rubber compounds based on the synthesised s-SBR and data for rubber compounds based on standard rubber indicates that their mechanical properties are at the same level. However, the tg δ at 60°C (determined on an RPA 2000 instrument) for rubber compounds based on a trial specimen has a lower value, which will make it possible to produce tyre rubbers providing a lower tyre rolling resistance.

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“…Использование металлоорганических соединений в процессах полимеризации позволяет повысить скорость процесса, снижает вклад побочных процессов гелеобразования (структурирование полимерной цепи), обеспечивает синтез полимера с необходимой микроструктурой [10][11][12].…”

Section: Introductionunclassified

Synthesis of alcoholate of sodium aliphatic aminoalcohols

Ахметшина¹,

Чиркова²

2019

Vestn. Voronež. gos. univ. inž. tehnol.

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At present, the development of modern materials science in the field of development and synthesis of new functional materials for use in various industries is impossible without providing a set of initial compounds of a given composition. Introduction to the composition of organic compounds of metals expanded the synthetic possibilities of organic chemistry. It is known that the catalysts, the polymerization unioneu you can use metallicity, alkoxides (alcoholates), and amides of metals. Currently, with the use of n-butylithium, industrial processes of obtaining SKD-L polybutadiene have been implemented.the Main purpose of this work was to obtain Ethylenediamine-N,N’-sodium diisopropylate and study it as a modifying additive to the initiating system for the production of statistical butadiene-styrene rubber. At the initial stage, it was important to synthesize hydroxypropylated Ethylenediamine, to determine the optimal process conditions, to analyze the composition of products, to establish the optimal ratio of the initial products corresponding to the highest yield of the hydroxypropylated product containing secondary amine groups. The work synthesized alcohol interaction oxypropylation of Ethylenediamine with sodium metal. It was found that the synthesized product exhibits the properties of a modifying additive to the initiating system of styrene-butadiene copolymerization. Butadiene-styrene rubber, obtained on the basis of Ethylenediamine-N, n’-sodium diisopropylate, is strictly statistical and is characterized by an average to a predominant content of 1.2 links in the butadiene part, low content of microblock styrene in the main part of the carbon chain.

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Copolymerization of 1,3-butadiene and styrene under the action of n-butyllithium in the presence of an amine-containing modifier in hexane

Cited by 5 publications

References 2 publications

The Influence of Temperature on the Copolymerisation of 1,3-butadiene and Styrene using a Modified Lithium-containing Initiating System

The Influence of Temperature on the Copolymerisation of 1,3-butadiene and Styrene using a Modified Lithium-containing Initiating System

The Influence of the Concentration of an ‘n-butyllithium–amine-containing Modifier’ Initiating System on the Copolymerisation of 1,3-butadiene and Styrene

Synthesis of alcoholate of sodium aliphatic aminoalcohols

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