8. Adhesion and Adhesives

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8. Adhesion and Adhesives
Adhesive forces

• Van der Waal
• Chemical bonding
• Mechanical interlocking

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Surface tension
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Surface preparation
Strength vs. surface preparation
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Surface treatments
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- Polyethylene, polypropylene, Teflon and
acetals require special surface preparation to
bond with normal adhesive.
- A formulation for Teflon etch is giving
below.
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Adhesives
Curing adhesives

• Epoxy
• Epoxy phenolic
• Polyesters
• Silicones
• Polyimides
• Polyurethanes
• Cyanoacrylates
• Acylics

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Solvent adhesives

• nitrocellulose
• Acrylics
• Rubber cements

Latexes

• Polyvinyl acetate

Hot melt adhesives
Welding
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Solvent bonding
Coupling agents

• Silanes

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• Titanates

Adhesive application
Joint design
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