TIT# Bromination of some styrene-diene block copolymers
AUT# Buzdugan, E.; Ghioca, P.; Badea, E. G.; Serban, S.; Stribeck, N.
SOU# Eur. Polym. J. (1997), 33, 1713-1716
LOC# xv031 @selbst.ftx
CLA#
COM#
APP#
MAT#
ABS# The bromine addition at the polydiene block double bonds of a radial
     styrene-butadiene (SBS) and a linear styrene-isoprene (SIS) block
     copolymer (thermoplastic elastomers) in tetrahydrofurane solution
     at 0°C, as been investigated by IR spectroscopy. In both cases the
     bromine reacts exclusively with the polydiene middle block double
     bonds; the polystyrene blocks are unaffected. The bromine reacts
     preferentially with the 1,4-type (cis and trans) double bonds of the
     polybutadiene block of SBS. At low bromination level (below 5%)
     the bromine reacts mainly with the 1,4-cis type double bonds of
     polyisoprene block of SIS, whereas at higher bromination level the
     bromine presents the same reactivity towards the 1,4-type (cis and
     trans) and vinylic (3,4-type) double bonds.