Liquid crystal polymers are polymers that align their molecular chains parallel over long distances prior to crystallizing from their melt or solution. There are two types: lyotropic LCPs formed from solution and thermotropic LCPs formed from melt. LCPs have highly polarized chain structures, aromatic rings, and disc-like molecular shapes. They have properties like high crystallinity, strength, toughness, and heat resistance. LCPs find applications in optics, electronics, transportation, aerospace, and more. Kevlar is a notable para-aramid fiber with very high tensile strength used for bulletproof vests, cables, tires, and other applications.

1. LIQUID
CRYSTAL
POLYMERS

2. LIQUID CRYSTAL POLYMER
• These polymers which have a glass or melting transition
tendency to allign their point.
chains parallel over a long
distance , prior to the
crystallization from their melt
or solution.
• Occurrence: Liquid
crystallinity in polymers may
occur either by dissolving a
polymer in a solvent or by
heating a polymer above its

3. TYPES OF LCPs
Lyotropic LCP Formed from their solution.
Thermotropic LCP Formed from their melt.

4. CONDITIONS
• Highly polarised chain
structure. Disc like structure
• Molecules should have
aromatic rings.
• Molecules should be like
disc.

5. MISCELLAENOUS
• Liquid-crystal polymers material most commonly
(LCPs) are a class of refers to polyethylene
aromatic polyester polymers. terephthalate (PET).
• Polyester Polymers:
Polyester is a category Preparation
of polymers which contain
the ester functional group in
their main chain. Although
there are many
polyesters, the term
"polyester" as a specific

6. PROPERTIES
• Higher crystallinity in temperature.
solid state.
• High tensile strength.
• Very tough.
• Higher Tm and Tg.
• Have property of
multiple internal
reflection.
• Used at higher working

7. APPLICATIONS
• For optical fibres. • Used as fillers for
• Electrical and electronics composites.
app.
• Transport,automotive,mil
itary app.
• Aircraft and aerospace
app.
• Chemical and consumer
app.

8. KEVLAR
• Kevlar is the material components.
registered trademark for
a para-aramid synthetic fiber.
• This high strength material
was first commercially used
as a replacement for steel in
racing tires.
• Typically it is spun into ropes
or fabric sheets that can be
used as such or as an
ingredient in composite

9. PREPRATION
Tere phthalic acid 1,4
dichloride diaminobenzene
Monomeric Unit

10. PROPERTIES
• Has a tensile strength of
about 3,620 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.

11. OTHER PROPERTIES
• It is slightly stronger at low temperatures.
• At higher temperatures the tensile strength is
immediately reduced by about 10–20%.
• After some hours the strength progressively
reduces further.

12. USES
• Used for aerospace
applications and aircraft
industry.
• Used for puncture
resistant tyres.
• Making ropes and cables.
• Bulletproof vests and
helmets.

13. OTHER USES
• Used in sports
equipments.
• Particle physics.
• Some fire dancing
props.