AMITY UNIVERSITY
RAJASTHAN
Mechanism
of Polymerization
Present By
Subhrangsu Sekhar Dey
M.Sc Applied Chemistry
Introduction
Monomers has to be two functionality for
polymerization.
Reaction Mechanism
1.Addition or Chain growth
1.1.Radical polymerization
1.2.Cationic polymerization
1.3.Anionic polymeriz...
Chain-growth Polymerization
Step-growth polymerization
Step Growth V/S Chain Growth
Application
Thermodynamics of Polymerization
Polymerizability of Monomers
Active Intermediates
Substituent Effects V/s Initiator
Free Radical Polymerization
Branching of the Polymer Chain
Application
Cationic Polymerization
the alkene monomer
reacts with an electrophile
Application
Anionic Polymerization
Nonterminated chains are called living polymers
The chains remain active until they are killed
Application
Co-ordination Polymerization
Ziegler–Natta catalyst
Polymerization of Dienes
Mechanism Of
Ziegler Natta Catalysis
Ziegler–Natta catalyst
Synthesis of Synthetic Rubber
Ring-Opening Polymerization
Stereochemistry of
Polymerization
substituents on the same side
substituents regularly alternate on both sides
General Mechanism of Chain-
Growth Polymerization
Progress of a Step-Growth
Polymerization
Step Growth Polymerization
Nylon 6,6
Cyclic Ethers
tertrahydropyran
dioxane
polymerization
unreactive
difficult
(substituents usually will prevent it)
Cyclic Ethers
1) Ethylene Oxide
RO
(DMSO)
PEO
Living Polymerization
Cyclic Ethers
Thermo Plastic Elastomer
3,3-bis(azidomethyl)oxetane (BAMO)
O
CH2
CH2 N3
N3
O CH2 C
CH2N3
CH2N3
CH2
3-azidom...
Cationic Polymerization
of Cyclic Ethers
OF3C S
O
O
O S CF3
O
O
O
F3C S
O
O
O S CF3
O
O
Difunctional PTMO (initiated by tr...
Cyclic Amides
C
N O
H
n
CH2
CH2 CH2 N CCH2CH2 CH2
H
O n
CH2 CH2 CCH2CH2 CH2N
O
N
O
H
Na
CH2
CH2
C
N
H2C
H2C
H2C
O
H
CH2 CH...
Siloxanes may be cyclic, linear or cross linked
polymer
Cyclosiloxanes
Mechanism of Siloxanes
Ring opening Siloxane
Siloxanes Polymerization
Polymer mechanism
Polymer mechanism
Polymer mechanism
Polymer mechanism
of 38

Polymer mechanism

Polymer
Published on: Mar 4, 2016
Published in: Science      
Source: www.slideshare.net


Transcripts - Polymer mechanism

  • 1. AMITY UNIVERSITY RAJASTHAN Mechanism of Polymerization Present By Subhrangsu Sekhar Dey M.Sc Applied Chemistry
  • 2. Introduction Monomers has to be two functionality for polymerization.
  • 3. Reaction Mechanism 1.Addition or Chain growth 1.1.Radical polymerization 1.2.Cationic polymerization 1.3.Anionic polymerization 2.Condensation or Step growth
  • 4. Chain-growth Polymerization
  • 5. Step-growth polymerization
  • 6. Step Growth V/S Chain Growth
  • 7. Application
  • 8. Thermodynamics of Polymerization
  • 9. Polymerizability of Monomers
  • 10. Active Intermediates
  • 11. Substituent Effects V/s Initiator
  • 12. Free Radical Polymerization
  • 13. Branching of the Polymer Chain
  • 14. Application
  • 15. Cationic Polymerization the alkene monomer reacts with an electrophile
  • 16. Application
  • 17. Anionic Polymerization Nonterminated chains are called living polymers The chains remain active until they are killed
  • 18. Application
  • 19. Co-ordination Polymerization Ziegler–Natta catalyst Polymerization of Dienes
  • 20. Mechanism Of Ziegler Natta Catalysis
  • 21. Ziegler–Natta catalyst Synthesis of Synthetic Rubber
  • 22. Ring-Opening Polymerization
  • 23. Stereochemistry of Polymerization substituents on the same side substituents regularly alternate on both sides
  • 24. General Mechanism of Chain- Growth Polymerization
  • 25. Progress of a Step-Growth Polymerization
  • 26. Step Growth Polymerization Nylon 6,6
  • 27. Cyclic Ethers tertrahydropyran dioxane polymerization unreactive difficult (substituents usually will prevent it)
  • 28. Cyclic Ethers 1) Ethylene Oxide RO (DMSO) PEO Living Polymerization
  • 29. Cyclic Ethers Thermo Plastic Elastomer 3,3-bis(azidomethyl)oxetane (BAMO) O CH2 CH2 N3 N3 O CH2 C CH2N3 CH2N3 CH2 3-azidomethyl-3-methyl oxetane (AMMO) O CH3 CH2 N3 O CH2 C CH2N3 CH3 CH2 BAMO AMMO BAMO
  • 30. Cationic Polymerization of Cyclic Ethers OF3C S O O O S CF3 O O O F3C S O O O S CF3 O O Difunctional PTMO (initiated by triflic anhydride) O CH2CH2CH2CH2OF3C S O O S O O CF3
  • 31. Cyclic Amides C N O H n CH2 CH2 CH2 N CCH2CH2 CH2 H O n CH2 CH2 CCH2CH2 CH2N O N O H Na CH2 CH2 C N H2C H2C H2C O H CH2 CH2 CCH2CH2 CH2N O N O H H CH2 CH2 C N H2C H2C H2C O + imide dimer: actural initiating species: exo-carbonyl makes it more reactive!Na CH2 CH2 C N H2C H2C H2C O H CH2 CH2 C N H2C H2C H2C O H CH2 CH2 C N H2C H2C H2C O NaH Anionic Initiated Polymerization
  • 32. Siloxanes may be cyclic, linear or cross linked polymer Cyclosiloxanes
  • 33. Mechanism of Siloxanes
  • 34. Ring opening Siloxane Siloxanes Polymerization

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