Characteristics and Applications of Polymers - Miscellaneous Applications

5 important questions on Characteristics and Applications of Polymers - Miscellaneous Applications

What two adhesive mechanisms are there?

Chemical, where the adhesive has a lot of intermolecular forces with the adherents.
Mechanical, where the adhesive penetrates the adherent surfaces.

On what factors does the selection of adhesives depend?

1. The materials to be bonded and their porosities.
2. The required adhesive properties.
3. Temperature exposure range.
4. Processing conditions.

What are the advantages of adhesive bonding over other joining technologies?

Lighter weight, joining different materials is possible, better fatigue resistance and cheap.
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How do pressure- sensitive adhesives work?

These materials contain polymer tackifying resins, which form small fibrils when the two surfaces are separated.

What are the most important characteristics of films?

Low density, high degree of flexibility, resistance to moisture and other chemicals, low permeability to gases.

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