Acrylic rubbers

ACRYLATE RUBBER (acrylic rubber), copolymers of acrylic acid esters (ethyl, butyl, alkoxyalkyl, alkoksitioalkilakrilatov) or together with vinyl monomers (acrylonitrile, 2-chloroethyl vinyl ether, vinilhloratsetatom et al.). The structure of macromolecules may also include links to third comonomer Extras. groups capable of participating in the curing (eg., glycidyl, carboxyl). The content of acrylate units in the macromolecule is typically 90-95 wt. h., the functional comonomer units, 1-7 wt. h. 100 wt. h. The copolymer.

The number average mol. m. rubbers 500-800 thousand. (according osmometry). Rubbers are amorphous, ie. Glass. from - 30 to - 53 ° C. Copolymers of butyl acrylate and ethyl acrylate-acrylonitrile-2-chloroethyl vinyl ether, good solubility. acetone, toluene, chloroform, etc. Org. p-solvent; nek- acrylate rubbers contain 70-90% insoluble portion (gelfraktsiya).

Aakrilatnye rubbers have a low gas permeability; eg. for air at 23 ° C it is 1.58 * 10-20 m2 / (Pa s) for N2 at 30 ° C, and Pressure. 0.8 MPa-0.99 * 10-20 m2 / (Pa * s). Dielectric. Holy Island rubbers relatively low (p 105 - 106 ohm * m). Due to the absence in the macromolecules of unsaturated. carbon-carbon bonds acrylate rubbers are stable during storage without antioxidant, heat, kislorode- and ozone resistance, resistant to UV radiation. When heating. hydrolyze in moist environments.