2. WHAT IS POLYMER?
POLYMER IS A MARCOMOLECULE WHICH
ARE JOINED TOGTHER BY SMALL
MOLECULE.
EXAMPLE: POLYETHYLENE
HEAT
n CH2=CH2
ETHYLENE
CATALYST
POLYETYLENE
(CH-CH2)
3. CHARACTERISTICS OF POLYMER
LOW DENSITY
GOOD MOULDABILITY
GOOD CORROSION RESISTANCE
POOR TENSILE STRENGTH
LOW MECHANICAL PROPERTIES
POOR TEMPERATURE RESISTANCE
5. NATURAL POLYMER
NATURAL POLYMER ARE THE POLYMER
EXIST AS NATURAL RESOURCE
SUCH AS CELLOUSE WHICH IS THE MAIN
CONSITUTENT OF WOOD AND PAPER.
EXAMPLES:CELLOUSE
AMINO ACIDS etc..,
6. SYNTHETIC POLYMER
POLYMER MADE BY ARTIFICIALLY USING
CHEMICAL ARE CALLED AS SYNTHETIC
POLYMERS.
EXAMPLE:BAKELITE
NEOPRENE
NYLON
POLYVINYL CHOLRIDE
POLYSTYRENE
7. NYLON 6-6
IT IS OTBTAINED BY POLYMERIZATION OF
HEXAMETHYLENE DIAMINE AND ADIPIC
ACID.
8. PROPERTIES
NYLON 6:6 IS LESS SOFT AND STIFF
MATERIAL.
THEY BEHAVE AS PLASTIC AS WELL AS
FIBER.
THAY HAVE GOOD MECHANICAL
STRENGTH.
HIGH ABRASION RESISTANCE.
9. USES
USED IN FIBERS IN MAKING
SCOKS,DRESSES etc.,
USED IN MOULDING PURPOSE FOR
MAKING GEAR.
USED FOR MAKING FILAMENTS IN
TOOTH BRUSHES.
11. PROPERTIES
HIGHLY CHEMICAL RESISTANCE TO
WATER,ACIDICS,ALKALIS AND OTHER
CHEMICALS.
THEY ARE FLEXIBLE AND TOUGH.
POSSES VERY GOOD HEAT
RESISTANCE.
POSSES EXCELLENT ADHESION
QUALITY.
12. USES
EPOXY RESIN ARE USED AS SURFACE
COATINGS AND ADHESIVE.
USED AS LAMINATING MATERIAL IN
ELECTRICAL EQUIPMENTS.
USED FOR THE PRODUCTION OF
COMPONENTS FOR AIRCRAFTS AND
AUOTMOBLIES.
19. IONIC MECHANISN
IT IS INITIATED BY A POSITIVE ION AND
NEGATIVE ION.
CATIONIC POLYMERIZATION
ANIONIC POLYMERIZATION
20. CATIONIC POLYMERISATION
IT TAKES PLACE WHEN ELECTRON
DONATING GROUPS LIKE PRESENT IN
MONOMER.
THESE GROUPS STABILISE THE
CABONIUM ION FORMATION.
STYRENE
INTIATOR USED TO INTIATE THE
REACTION ARE
24. ANIONIC POLYMERIZATION
IT TAKE PLACE WHEN ELECTRON
WITHDRAWING
GROUP LIKE ()PRESENT IN MONOMER.
THESE GROUP STABILISE CARBANION
FORMATION.
ACRYLONITRILE
INITIATOR USED TO INITIATE THE REACTION
ARE LEWIS BASES LIKE()
