1. Adhesives and Adhesion
Part 2

2. Polymerization

3. Faculty of Polymer Eng. Sahand University of Tech.
Polymerization
Polymer =
Monomers
Polymer
(Poly +Mer)
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Faculty of Polymer Eng. Sahand University of Tech.

4. Polymerization Addition Polymerization Condensation Copolymerization
Radical
Cationic
Anionic
Condensation
Copolymerization
Crosslinking

5. Polymerization
Addition

6. Addition Polymerization+
(CH2-CH2)n
n CH2=CH2
Ethylene
Polyethylene
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7. Types of Polymerization Reactions
Radical Chain Polymerization
Cationic Chain Polymerization
Anionic Chain Polymerization
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8. Types of Radical Initiation:
Thermal
Redox
Photochemical
Ionizing radiations
Electroinitiation
Plasma
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9. Thermal Initiators
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10. Redox Initiators
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17. soluble in polar solvents only
Initiation:
Solubility:
soluble in polar solvents only
( such as: ether)

18. (3) Organometallic compounds
Alkyl metal compound: RLi
Metal amides: NaNH2, KNH2
Grignard reagent: RMgX
a. Species
b. Initiation
c. Solubility
Initiation:
Solubility:
Soluble in nonpolar solvents

19. A pair of isolated electrons on the heteroatoms
(4) Nucleophilic initiator
A pair of isolated electrons on the heteroatoms
For example:
initiator

20. Polymerization
Finial Conclusion: Three Steps

21. Polymerization:
Condensation

22. Faculty of Polymer Eng. Sahand University of Tech.
Types of Polymerization Reactions
Condensation + +
n HO-R-OH + n ( HOOC-R’-COOH)
H-(-O-R-OCO-R’-CO-)n-OH + (2n-1) H2O
A Polyester + +
n (H2N-R-COOH)
H(-HN-R-CO-NH-R-CO-)nOH +(n-1) H2O
Nylon (a Polyamide)
5/10/2019
Faculty of Polymer Eng. Sahand University of Tech.

23. Overall Reaction Scheme
monomer + monomer  dimer
dimer + monomer  trimer
dimer + dimer  teramer
dimer + trimer  pentamer
trimer + monomer  tetramer
tetramer +pentamer heptamer
n-mer + m-mer  (n+m)mer
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24. Sahand University of Technology
Types of Monomers
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25. Polymerization
Condensation

26. Sahand University of Technology
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Sahand University of Technology

27. Sahand University of Technology
Alkyd Resins
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28. Sahand University of Technology
2- Phenolic Polymers, a) Resol
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Sahand University of Technology

29. Sahand University of Technology
Curing of Resol Phenolic
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30. Sahand University of Technology
b) Novalac Phenolics
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31. Sahand University of Technology
Curing and Applications of Phenolics
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Sahand University of Technology

32. Sahand University of Technology
3- Amino Plastics
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Sahand University of Technology

33. Sahand University of Technology
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Sahand University of Technology

34. Sahand University of Technology
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Sahand University of Technology

35. Sahand University of Technology
4- Epoxy Resins
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36. Sahand University of Technology
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Sahand University of Technology

37. Sahand University of Technology
5- Polyurethanes
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38. Sahand University of Technology
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Sahand University of Technology

39. Sahand University of Technology
6- Polysiloxanes
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40. Sahand University of Technology
7- Polysulfides
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Sahand University of Technology

42. Glass Transition Temperature
Transition between “rubbery” and “brittle/glassy” behavior
Tg should not fall between Min and Max projected use temperatures for high stress applications
A function of adhesive formulation and cure temperature