kevalar

1. PROPERTIES
FORMULAE
USES

2. BASIC INFORMATION
High tensile strength at low weight
Low elongation to break
High modulus(Structural Rigidity)
High Chemical Resistance
High Cut Resistance
Flame Resistant, Self extinguishing

3.  Has tensile strength of about 3620 MPa.
 A relative density of 1.44
 5 times stronger than steel
 Although it has high melting point, it can be
easily moulded
 It has high heat stability
 It is slightly stronger at low temperatures
 After some hours the strength progressively
reduces further

4. PREPARATION
 Kevlar is synthesized in solution from the
monomers 1,4-phenylene-diamine (para-
phenylenediamine) and terephthaloyl chloride in
acondensation reaction yielding hydrochloric
acid as a byproduct.The result has liquid-
crystalline behavior, and mechanical drawing
orients the polymer chains in the fiber's
direction. Hexamethylphosphoramide (HMPA)
was the solvent initially used for the
polymerization, but for safety reasons, DuPont
replaced it by a solution of N-methyl-pyrrolidone
and calcium chloride

5. Formulae
 It has the Iupac name poly(imino-p-
phenyleneimino=terephthaloyl)
 Its molecular formula is [-CO-C6H4-CO-NH-
C6H4-NH-]n
 It is made up of the monomers 4-phenylene-
diamine(para-phenylenediamine) and
terephthaloyl chloride

6. USES Honey comb core technology
 In Aerospace
 Used for weight reduction& increase fuel efficiency


7.  In Marine
 Light weight & high impact and fatigue resistsnce
 Liquid body armour
 Silicon particles suspended in polyethylene glycol
 Enclosed between different kevlar sheets

8.  Light weight Helmet
 Reduction in 15% back face deformation
 Advanced vehicle armour
 Reliable and durable ballastic protection
 Inherent fire & flame resistance
 Automotive industry
 Tyres
 Belts
 Brake pads
 gaskets

9.  Optical cables
 Provide crush resistance
 Load bearing capacity
 Heat resistant gloves
 Cut resistant
 High strength