SYNTHESIS OF STYRENE-ISOPRENE-STYRENE BLOCK COPOLYMERS WITH ALPHA,OMEGA-DIEPOXY GROUPS - ADHESIVE PROPERTIES

Block copolymers (SIS) of styrene and isoprene, with alpha,omega-diepoxy groups, have been synthesized for use as adhesives. The property of mechanical resistance is provided by the styrene blocks and the elastic property by the isoprene blocks. The results of the work are: (i) the cis-1,4-content of the isoprene blocks is 66%; (ii) the styrene gives a difunctional SIS; (iii) functionalization leads to epoxy groups at the chain-ends; (iv) tests on cross-linking and adhesion show that the products have fairly good adhesive properties.