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:. ADHESIVES INTRODUCTION

Introduction
Adhesive advantages
Adhesive disadvantages
Adhesive applications
Definition of adhesive
Definition of polymer
Definition of adhesion
Adhesion theories
Contact angle
Surface energy
Thermoplastic
Elastomer
Thermoset
Glass transition temperature
Covalent chemical bond
Intermolecular forces
Mechanical properties adhesives
Polyaddition
Polycondensation
Polymerization
 
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Polyaddition - polyaddition reactions

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What is the polyaddition?

Polyaddition reactions are chemical reactions in which the polymer is originated by successive additions of functional groups (monomer A) inside of molecular structures with double bonds (monomer B).

We start from a molecule containing double bonds (monomer B), which through the action of temperature, pressure or a chemical agent breaks the double bond, is at this moment when the monomer A occupies the place of the double bond and incorporate to the structure and form the polymer.

One of the main features of polyaddition reactions is that during the formation of the polymer does not emit any volatile compounds, as is the case of polycondensation reactions.

polyaddition

Adhesives cured by polyaddition:

glue point Epoxy Adhesives:

  • Epoxy adhesives 2 components

  • Epoxy adhesives 1 component

Polyurethane Adhesives:

  • Polyurethane Adhesives 2-component

  • Polyurethane Adhesives 1 component (moisture)

  • Polyurethane Adhesives 1 component (heat)

Silicone Adhesives:

  • Adhesives 2-component silicone

In general the rate of cure of the adhesive of polyaddition is more than the curing adhesives by polycondensation and below the polymerization curing adhesives.

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