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NATURAL RUBBER VS SYNTHETIC RUBBER - Coggle Diagram
NATURAL RUBBER VS SYNTHETIC RUBBER
WHAT IS NATURAL RUBBER
has elastic properties and it undergoes long range reversible extension even if relatively small force is applied to it.
Natural rubber (NR) is an elastic hydrocarbon polymer that naturally occurs as a milky colloidal suspension (latex) in the sap of the rubber tree (hevea brasiliensis).
Natural rubber latex is a colloid system having the rubber particles dispersed in water.
Some rubber products (e.g. foam rubber, gloves, condoms, glues) are produced directly from latex.
NATURAL RUBBER HARVESTING AND PROCESSING
Vulcanisation process
Vulcanization is a
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
gives a
more stable elasticity
than the purely electrostatic nature of the pre-vulcanisation bonds.
Amount of sulphur used for vulcanization
process
determines the extent of hardness
or toughness of the cured rubber.
PROPERTIES OF RUBBER IMPROVED BY:
tensile strength
Elasticity
Hardness
WHAT IS SYNTHETIC RUBBER
Thermoplastic polymer (TPE)
that possesses the properties of a rubber.
The benefit of using TPE is the ability to stretch to moderate elongations and return to its near original shape, creating a longer life and better physical range than other materials.
Examples: Shoe soles, sheet, tubing for medical applications, athletic footwear
DIFFERENCE BETWEEN VULCANIZED RUBBER AND NATURAL RUBBER
NATURAL RUBBER
Thermoplastic, soft and sticky, low elasticity
SYNTHETIC RUBBER
Thermoset, hard and non-sticky, high elasticity
Thermoset rubber
SBS Rubber:
hard rubber that is used to make soles of shoes, tire treads, and other products where durability is important.
Butyl Rubber:
Rubber stopper, chewing gum, tire inner tube
Trans-polyisoprene:
Was obtaines by the free radical polymerization of isoprene (non-elasticity)
DIFFERENCES
SYNTHETIC RUBBER
Made of various monomers after the polymerization.
Better resistance to abrasion than natural rubber, as well as superior resistance to heat and the effects of aging.
Many types of synthetic rubber are flame-resistant, so it can be used as insulation for electrical devices.
It also remains flexible at low temperatures and is resistant to grease and oil.
NATURAL RUBBER
Extracted from rubber trees and going through processing of vulcanization.
High tensile strength and is resistant to fatigue from wear such as chipping, cutting or tearing.
Moderate resistance to damage from exposure to heat, light and the ozone in the air.