Main regularities of polymerization of butadiene by the action of a composite sodium-aluminium organic initiator in hydrocarbon medium

Arest-Yakubovich, A. A.; Anosov, V.I.; Basova, R. V.; Золотарев, В Л; Kristal'nyi, E.V.; Makhortov, A.P.; Nakhmanovich, B. I.

doi:10.1016/0032-3950(82)90460-9

Cited by 5 publications

(2 citation statements)

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“…However, it was shown that this opinion is wrong. The first example was a complex sodium-aluminum system which contained well-known disodium oligo-a-methyl styrene in combination with tn-isobutylaluminum or di-zso-butylaluminum hydride (16)(17)(18). It was found that the use of alkylaluminum modifiers suppresses chain transfer processes, which are characteristic of organosodium initiators, and thus enables to obtain high-molecular-weight polymer even in toluene solution.…”

Section: Prospects For Developmentmentioning

confidence: 98%

Commercial Production of 1,2-Polybutadiene

Arest-Yakubovich

Golberg²,

Золотарев³

et al. 1998

ACS Symposium Series

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The technology of the synthesis, properties, and fields of application of high and low-molecular-weight 1,2-polybutadienes are described. The polymerization is performed as a continuous solution process with the use of n-BuLi -diglyme catalytic system. Certain advantages of anionic process over a standard solution polymerization with Ziegler-Natta catalysts are demonstrated. The improvements in the process based on the use of sodium or potassium alkoxides or new organosodium initiators are also described.One of the main practical advantages of anionic polymerization processes is their unique flexibility. They can be adapted relatively easily to various technological schemes; besides, they give a wide possibility for controlling micro and macro structure of polymers (the structure of monomer units, molar masses, MWD, degree of branching, etc.) and, consequently, their properties. These advantages are clearly demonstrated by the experience of the development of the industrial synthesis of 1,2-polybutadiene rubber (1,2-PB) via a solution process.As is well known, polybutadiene of high (50-60%) 1,2-unit content obtained via heterogeneous polymerization with the use of sodium metal was the first type of commercial synthetic rubber (1,2). After World War II it was completely forced out from tire industry by emulsion SBR and stereoregular polymers. However, due to its unique set of properties, 1,2-PB has found many industrial applications for non-tire goods. Nowadays, several types of high-and low-molecular-weight high vinyl polybutadienes are produced via continuous solution polymerization. This process was developed in the middle 1970s in application to already functioning technology of the synthesis of solution czs-l,4-polybutadiene rubber (3).

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Section: Prospects For Developmentmentioning

confidence: 98%

Commercial Production of 1,2-Polybutadiene

Arest-Yakubovich

Golberg²,

Золотарев³

et al. 1998

ACS Symposium Series

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“…Several multi-metallic systems (typically based on sodium, potassium, magnesium, or aluminum derivatives) are described in the literature to polymerize dienes and styrene. These systems are commonly based on alkylsodium / trialkylaluminum (for butadiene polymerization) [20], [21], potassium hydride / alkali metal alkoxide / trialkylaluminum (for isoprene and butadiene polymerization [22]), alkylmagnesium / alkali or alkaline earth derivatives (for butadiene polymerization) [23]- [26], and metal-zinc tetraalkyl (metal = Ca, Sr or Ba), for dienes / styrene copolymerization [27]. Looking at Mg-based systems, bimetallic systems based on R3MgK ([tert-PeOK] / [R3MgK] = 1.5 -2.3) were developed by Halasa and coworkers [23].…”

Section: Introductionmentioning

confidence: 99%