all thing about polycarbonate

1. All thing about
polycarbonate

2. Presented by :
Shadi Razmara
department of Chemical engineering
Isfahan university of technology
Isfahan – Iran
2017
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3. History
What is pc ?
Chemical structure
Synthesis
Properties
applications
content
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4. PC was developed in 1953
by the German scientist
"Hermann Schnell" who was
chemist in German company
"Bayer"
2-PC was introduced in United
States Of America in 1960 by
the general electric company
History
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5. What is pc
General polymer
Thermoplastic
Containing
carbonate
groups
High electrical
& heat
resistance
non-flammable
Lightweight
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6. What is pc
Good
transparency
Can be recycled
most popular
trade name is
LEXAN
Anti UV
Impact
resistance(unbre
akable)
Very
pliable(formed at
room
temperature)
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7. Chemical
structure
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8. Chemical
structure
Bisphenol A + carbonate group
Contain 2 aromatic rings(for stiff backbone)
Amorphous structure
Most often synthesized from bisphenol A & phosgene (COCl2)
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9. synthesis
Polymerizasion
Step 1
Bisphenol A are reacted with proton acceptors
such as NaOH
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10. synthesis
Polymerizasion
Step 2
The deprotonated bisphenol reacted with phosgene
& a catalyst (often times Pyridine) in 25-35 ℃
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11. synthesis
Polymerizasion
Step 3
Chloride anions are eliminated in order to react more
bisphenol & phosgene
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12. properties
• Melt temperature 220-230 ℃
• Specific heat capacity 1.2-1.3 KJ/kg.K
• Density 1.19 g/cm3
• Coefficient of friction 0.31
• Speed of sound 2270 m/s
• Glass transition tem. 147 ℃
• linear thermal expansion co
• Compressive strength 80 Mpa
65 − 70 ∗ 10−6
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13. Applications
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14. application
 safety
 Bullet proof glass
 Impact resistance
Polycarbonate sheet
is as clear as glass &
250 times stronger.
It‘s also 30 times stro
nger than Acrylics.
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15. application
 UV protection Light weight
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16. application
Eye lenses
Polycarbonate lenses are one
Of the lightest, thinnest and safest
lenses on the market today
Anti UV
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17. application
 headlamp
 bottles
 Compact disc
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18. application
 Medical
 automotive
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19. application
 Sound barrier
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20. 20
 construction
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21. o Scratches easily
o high price ) It is much more expensive than
the other plastics or the glass (
o Manufacturing process is not very environm
entally friendly (high temp & phosgene(
o it has yellowing over time
disadvantage
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22. October 2017