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Encyclopedia > Butyl rubber

Butyl rubber is a synthetic rubber, a random copolymer of about 98% of isobutylene with about 2% of isoprene. It has excellent impermeability, and the long polyisobutylene segments of its polymer chains give it good flex properties. Synthetic rubber is a type of artificially-made polymer material which acts as an elastomer. ... A heteropolymer, also called a copolymer, is a polymer formed when two different types of monomer are linked in the same polymer chain. ... 1-butene cis-2-butene trans-2-butene methylpropene There are four alkenes which have four carbon atoms and one double bond in their chemical structure. ... Isoprene Chemical name 2-Methyl-1,3-butadiene Chemical formula C5H8 Molecular mass 68. ...

The first major application of butyl rubber were tire inner tubes. This remains an important segment of its market even today. Firestone tire A tire (US spelling) or tyre (UK spelling) is a roughly toroidal piece of (usually) rubber placed on a wheel to cushion it. ... Firestone tire A tire (US spelling) or tyre (UK spelling) is a roughly toroidal piece of (usually) rubber placed on a wheel to cushion it. ...

In 1950s and 1960s, halogenated butyl rubber (halobutyl) was developed, in its chlorinated (chlorobutyl) and brominated (bromobutyl) variant, providing significantly higher curing rates and allowing covulcanization with other rubbers like natural rubber and styrene-butadiene rubber. Halobutyl is today the most important material for inner tubes. Rubber is an elastic hydrocarbon polymer which occurs as a milky emulsion (known as latex) in the sap of a number of plants but can also be produced synthetically. ... Styrene Butadiene SBR (SBR) is a polymeride consisting of styrene and butadiene. ...

The butyl rubber is vulcanized by elementar sulfur. Zinc oxide can be used instead for halobutyl. Vulcanization is the process of cross-linking elastomer molecules to make the bulk material harder, less soluble and more durable. ... General Name, Symbol, Number sulfur, S, 16 Chemical series nonmetals Group, Period, Block 16, 3, p Appearance lemon yellow Atomic mass 32. ... Zinc oxide is a chemical compound with formula ZnO. It is nearly insoluble in water but soluble in acids or alkalis. ...

  Results from FactBites:
Butyl rubber - Wikipedia, the free encyclopedia (449 words)
)—is a synthetic rubber, a homopolymer of 2-methyl-1-propene.
A synthetic rubber, or elastomer, polyisobutylene is impermeable to air and used in many applications requiring an airtight rubber.
The butyl rubber is vulcanized by elemental sulfur.
U.S. Patent: 5264494 - Halogenated butyl rubber graft copolymers - November 23, 1993 (5519 words)
Rubber compositions comprising the halogenated butyl rubber graft copolymers upon vulcanization exhibit improved abrasion resistance and wet skid resistance while a desirable balance of other physical properties is maintained.
The halogenated butyl rubber onto which is grafted the polymer based on conjugated diolefin monomers is selected from chlorinated butyl rubber and brominated butyl rubber and is preferably a chlorinated butyl rubber having a chlorine content of from about 0.75 to about 1.75 weight percent chlorine based on the chlorinated butyl rubber.
A solution of purified chlorinated butyl rubber (4.8 g) in dry cyclohexane (425 g) under a positive pressure of nitrogen was then transferred to a reaction vessel containing the freshly prepared lithium terminated polybutadiene (16.8 g) in cyclohexane (107.0 g) and the mixture was stirred vigorously at ambient temperature for 16 hours.
  More results at FactBites »



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