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NATURAL AND SYNTHETIC RUBBER - Coggle Diagram
NATURAL AND SYNTHETIC RUBBER
NATURAL RUBBER
Description Of Natural Rubber
Natural rubber (NR) is an elastic hydrocarbon polymer that naturally occurs as latex.
Found in the sap of rubber tree (Hevea Brasiliense)
It is a natural polymer of isoprene (2-Methyl-1,3-Butadiene)
It is obtained from the rubber tree by tapping based on the cutting of the tree bark by special knife.
Example Of Rubber Products
Foam
Rubber Band
Glues
Gloves
Vulcanization Process
Cross linking process in which individual molecules of rubber (polymer) are converted into a three dimensional network of interconnected polymer chains through chemical cross links.
Mixing of crude rubber with about 5-30% of sulphur and other additives.
Molding (shape) the rubber mixture.
Heating the mixture. Increased the temperature will speed up the vulcanization process resulting in fast and complete cross-linking.
Properties of Rubber after Vulcanization
Elasticity
Tensile Strength
Hardness
Tear Strength
Abrasion Resistance
Resistance to Solvents
Synthetic Rubber
Thermoset Rubber
Trans-polyisoporene
Neoprene
SBS Rubber
Nitrile Rubber (BUNA-N)
Butyl Rubber
Thermoplastic Elastomers (TPE)
Benefit of TPE
Have ability to stretch to moderate elongations.
Return to its near original shape.
Creating a longer life.
Better physical range than other materials.
Example Of TPE
Hipex
Thermolast
Copec