Polybutadiene


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polybutadiene

[¦päl·i‚byüd·ə′dī‚ēn]
(organic chemistry)
Oil-extendable synthetic elastomer polymer made from butadiene; resilience is similar to natural rubber; it is blended with natural rubber for use in tire and other rubber products. Also known as butadiene rubber.

Polybutadiene

 

a product of butadiene polymerization. Molecules of butadiene may join together in the chain at the positions cis-1,4 (I); trans-1,4 (II); and 1,2- (III):

The relationship and distribution of the structures in the chain, which depend on the type of catalyst and on the method and conditions of polymerization, determine the properties of the polymer.

Four stereoregular polybutadienes (cis-1,4; trans-1,4; isotactic-1,2; syndiotactic-1,2), which are produced by stereo-specific polymerization, and several statistical polybutadienes are known. Rubber-like polybutadienes are of great industrial value. Polybutadienes that contain more than 70–90 percent trans-1,4 or 1,2- links of isotactic or syndiotactic structure are white, linearly crystallizing fiber-forming plastics. In the USA, trans-1,4 polybutadiene is produced commercially under the trade name Trans-4; it contains about 90 percent trans-1,4 links (number-average molecular weight, 100,000). It is soluble in benzene and CCl4 and is vulcanized by sulfur. Trans-4 vulcanizates are characterized by high strength and hardness and by a durability surpassing that of vulcanizates of natural and butadiene-styrene rubbers. Trans-4 is used in the manufacture of sole rubbers, flooring, gaskets, and other commercial products.

REFERENCES

See References under .

F. E. KUPERMAN

References in periodicals archive ?
By putting the value of die Mooney viscosity/solution viscosity/loss compliance difference in the correlation equations, we can predict the relative cold flow for unknown polybutadiene raw rubber samples, and we can also predict die solution viscosity using die correlation equation between Mooney viscosity and solution viscosity.
As indicated earlier, these hydrogenation conditions were optimized for the selective saturation of the polybutadiene block without affecting the polystyrene block or the molecular weight.
The complex is expected to produce 460,000 t/y of ethylene, 350,000 t/y of polyethylene, 20,000 t/y of butadiene and 25,000 t/y of polybutadiene.
Sartomer Company will increase the price of its Poly bd hydroxyl-terminated polybutadiene resins as of March 1, 2005 (April 1, 2005 for contract customers) in the Americas and the Asia-Pacific region.
On the other hand, this difference should be minimized if test temperature approaches the glass transition temperature of polybutadiene. Again, this is attributed to a molecular restriction of the compatibilizer.
Elastomers made at Schkopau are styrene butadiene rubber (SBR), polybutadiene rubber (PBR), anionic initiated polymerised rubbers of lithium Lo Cis polybutadiene rubber (Li-PBR), nickel Ziegler-Natta catalysed Hi Cis polybutadiene rubber (Ni-PBR), emulsion styrene butadiene rubber (ESBR) and solution styrene butadiene rubber (SSBR).
When Ricon[R], a functionalized liquid polybutadiene oligomer, or SMA[R] (styrene maleic anhydride) is applied to minerals using an aqueous solution, interfacial surface tension decreases.
Polybutadiene latex (SBL) has also been produced domestically by PT Rhodia Indolatex, PT Dow Chemical Indonesia and PT BASF.
Inc, Exton, Pa., is reportedly the first to be made from hydroxyl-terminated polybutadiene. Poly bd 2035 and three other related TPU grades have a novel multiblock structure and a polybutadiene backbone that gives greater resistance to strong acids and bases than standard TPUs.
Key statement: The crosslinkable rubber composition comprises a first elastomer consisting of polybutadiene having a Mooney plasticity ranging from 40 to 70 Mooney units, the content of the first elastomer being strictly greater than 50 phr, a second elastomer, and a carbon black having a specific surface area within a range of values extending from 15 m2/g to 25 m2/g and an oil adsorption number of compressed sample (COAN) within a range of values extending from 65 ml/100 g to 85 ml/100 g.
Sartomer will hold the exclusive rights and trademark use for the worldwide marketing and sales of Kaucuk's Krasol polybutadiene products.