The Structure and Physical -Chemical Properties of Polymers in Pressure-sensitive Adhesives (PSA)

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Abstract

The term "pressure-sensitive adhesive" represents a group of adhesives that makes strong
contact between the substrates by hand, in dry state, using the finger pressure at room
temperature. This study focuses on the chemical structure of different pressure sensitive
adhesives. The base polymers, used in a pressure sensitive adhesive, usually include
acrylic polymers, silicones, polyurethanes and polyesters. Acrylic polymers, in pressure
sensitive adhesives, can be either water or solvent-based and or free of organic solvent.
Acrylic polymers are inherently sensitive to pressure. The adhesion properties of an acrylic
pressure sensitive adhesive, containing monomers with high or low glass temperature, can
be altered by changing the monomer content. The pressure adhesives based on silicon or
other rubbers are generally used in tapes. Acrylic pressure sensitive adhesive can be used
in temperature range of 40 to 300°C. The rubber-based pressure adhesive makes contact
with a high and low energy level. Polyurethane-based pressure sensitive adhesive, stable
at 40 to 100°C, shows a high flexibility after drying. The great adherence of polyestersbased
pressure sensitive adhesive can be only achieved using aliphatic polyesters with a
molecular weight of 5000 to 10000 Dalton and a glass temperature between 25 and 47°C.

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