Natural and synthetic rubber(high polymer)
Natural rubber consists of suitable polymers of the organic compound isoprene with minor impurities of other organic compounds plus water. Elastomers are the forms of polyisoprene that are useful as natural rubbers The natural rubber is harvested mainly in the form of the latex from certain trees. The latex is a sticky, milky colloid drawn off by making incisions into the bark and collecting the fluid in vessels. This process obtaining latex is called “tapping”. The latex then is refined into rubber which is ready for commercial processing.
Varieties of natural rubbers:The major commercial source of natural rubber latex is the”Para rubber tree”. Rubber has stress-strain behavior which exhibits the Mullins effect the Payne effect, and is often termed as hyperelastic.
QUESTIONS RELATED TO NATURAL RUBBER:
Q1. WHAT IS NATURAL RUBBER?
Q2. WHAT ARE THE FORMS OF polyisoprene THAT ARE USEFUL AS NATURAL RUBBERS?
Q3. WHAT IS LATEX?
Q4. WHAT IS TAPPING?
Synthetic rubber is any type of artificial elastomer mainly synthesised from petroleum byproducts. It is made by the polymerization of a variety of petroleum-based precursors called monomers. The most prevalent synthetic rubbers are styrene-butadine rubbers (SBR) , isoprene(2-methyl-1,3-butadiene), chloroprene (2-chloro-1,3-butadiene), and isobutylene (methylpropene) with a small percentage of isoprene for cross-linking.
common synthetic rubbers: Polyacrylate ,Rubber, Ethylene-acrylate Rubber, Polyester Urethane, Bromo Isobutylene Isoprene, Chloro Isobutylene Isoprene.
QUESTIONS RELATED TO SYNTHETIC RUBBER
Q1.ELASTOMERS ARE SYNTHESIZED FROM WHERE?
Q2.WHAT IS POLYMERIZATION?