Carboxylate (carboxyl-containing) rubbers - rubbers containing unsaturated carboxylic acids as comonomer .
Content
Classification and properties
There are butadiene , isoprene , butadiene-styrene, butadiene-nitrile carboxylate rubbers (under the name of the main monomer ).
Due to the presence of polar carboxyl groups, they have increased adhesion to metals and other substrates, as well as increased cohesion . Another feature due to the presence of carboxyl groups is the ability to cure under the influence of metal oxides (zinc, magnesium oxides, etc.) due to the formation of ionic bonds of carboxylate anions with metal ions on the surface of oxide particles.
Getting
Carboxylate rubbers are prepared by emulsion copolymerization of the corresponding monomers with unsaturated carboxylic acids β acrylic , itaconic or methacrylic . Rubbers containing 1-2% unsaturated acids are most used.
Application
Carboxylate rubbers are amorphous and do not crystallize under tension, have high resistance to thermal aging and high resistance to crack growth. Widely used in the rubber industry.
See also
- Rubber
- Rubber
- Elastomers
- Gutta-percha
Literature
- Koshelev F.F. General technology of rubber. -M.: Chemistry, 1978