Poly Methyl Methacrylate,Polycarbonate,Silicone Rubbers,Epoxy Resins,Kevlar,Carbon fibers - synthesis, uses and properties are listed here.

1. POLYMERS
Dr. S. Sreenivasa
Associate Professor and Coordinator
DOS and R in Organic Chemistry
Tumkur University, Tumakuru

2. SYNTHESIS OF POLY METHYL METHACRYLATE
Preparation: Methyl methacrylate on polymerization in presence of a peroxide
initiator gives poly methyl methacrylate (PMMA)

3. Properties:
 Plexi glass(PMMA) is a white trasperent thermoplastic.
 It has an excellent optical clarity, which is not affected by
sunlight or age.
 It has poor scratch resistance.
 It is resistant to most of the chemicals but soluble in
most of the organic solvents.

4. Applications:

5. SYNTHESIS OF POLY TETRA FLUORO ETHYLENE (TEFLON)
Preparation:
In presence of a peroxide initiator tetra fluoro ethylene undergoes
polymerization giving poly tetra fluro ehtylene commonly called as
Teflon.

6. Properties:
 Teflon is linear polymer with no branching and is a
thermoplastic
 It has high degree of crystallinity (93 % to 98 %) with high
melting point (327o C)
 Practically insoluble in any solvent, Shows high resistance
to corrosive chemicals.
 Not wetted by either by water or oil.
High thermal stability, low coefficient of friction and an
excellent electrical insulating material hence it is called
wonder plastic

7. Anti corrosive coating
Applications:

8. Preparation:
It is prepared by the poly addition reaction between a diisocyanate and
a diol Poly urethane is characterized by a urethane linkage.
Polyurethane

9. Properties :
 Polyurethane is resistant to oil, grease and corrosive
chemicals
 They has good stretchable and elastic property.
 It has high abrasion resistant behavior.

10. Applications:

11. Polycarbonate
Preparation:
It is prepared by the condensation polymerization of Bisphenol A and
phosgene to give polycarbonates

12. Properties:
 Properties of Polycarbonate is similar to that of PMMA
but shows greater toughness than
PMMA.
 It has glass transition temperature of 1570C, hence will
be employed as a substitute of PMMA, because of
variable range of thermal operations which is not
possible in case of PMMA

13. Applications:

14. SILICONE RUBBER
Preparation:
Silicone rubber is prepared by the condensation polymerization of
di-alkyl, di-hydroxy silane

15. Properties:
 It possesses high thermal stability.
 It has good good lubricating properties.
 It is resistant to acids, alkalis and it is a
water repellent.

16. Applications:

17. EPOXY RESIN
Preparation:
It is prepared by the condensation polymerization between
Bisphenol A and Epichlorohydrin in presence of an alkali

18. Properties:
 They are highly resistant to water, solvents ,
acids and alkali.
They possess excellent adhesion and chemical
resistance property.

19. Shrink proof clothing

20. KEVLAR
Preparation:
It is prepared by the condensation polymerization of
para-phenylenediamine and terepthaloyl chloride
para-phenylenediamine terepthaloyl chloride
Kevlar

21. Properties:
Kevlar is a very strong material – about five times
stronger than steel.
 Possess high tensile strength, low weight and high
chemical inertness.
 High cut resistant, fracture resistance and flame
resistance.

22. Reinforced tiresBody armor
Reinforced plastic

23. CARBON FIBER

24. Properties:
It possess high tensile strength, low weight and low
thermal expansion coefficient.
 It is extremely difficult to bent carbon fiber but will
crack easily if hit with a hammer.
 It has high fire resistant behavior, can be employed in
polymer composites.