Chemical Expression Of Thermoset Silicones, Applications, Properties
These two synthetic rubbers are very important in polymer chemistry. In here we will show you the general properties and applications of these two synthetic rubbers. And you can find numeric information about butadiene rubber and butyl rubbers below.
Butyl rubber is produced as copolimers of polyisobutylene and polyisoprene. The precentages of these two compounds in butyl rubber around 98-99% and 1-2% respectively. It has very low air permeability that leads to use in such applications as inflatable tubes and tubeless tyre liners.
The compound of isobutylene has chemical representation (C4H8)n and isoprene has (C5H8)n. The ‘n’ means the number of monomers that these two compunds formed. In market, the symbol of butyl rubber is BTL and you can find out commercial butyl rubber products with this symbol. The avaliable temperature limit that butyl rubber can be used from -50C to 110C. At 300% elongation, butyl rubber has modulus of elasticity of 7 MPa. Also the tensile strength of butyl rubber is 20 MPa. The maximum elongation according to its original shape is 700%. Density of butyl rubber is around 0.92 gr/cm^3.
This synthetic elastomer is combined with other rubber to produce automotive tires. It is generally mixed with natural rubbers. In some applications, butadiene rubber is mixed with styrene to obtain styrene-butadiene rubber. With the combination of other rubbers, good tensile strength, tear ersistance and ease of processing is obtained.
The most important example of butadiane rubber is polybutadiene which has chemical representation of (C4H6)n. The commercial symbol of polybutadiene rubber is BR and you can find it market with this symbol. The avaliable temperature range to use polybutadiene rubber is nearly same with butyl rubber. Tensile strength of polybutadiene is around 15 MPa. The maximum elongation that polybutadiene can reach is around 500% according to its original shape. Density is 0.92 g/cm^3.
These are the general characteristics of butadiene and butyk rubbers. Do not forget to leave your comments and questions about butadiene and butyl rubbers below. Your precious feedbacks are very important for us.