Sulfonated 3

4-polyisoprene and its ionomers were synthesized. Their structures and cry-stallinity were examined by IR

1H-NMR

WAXD and SAXS. The results show that the cry-stallinity of the ionomers is reduced with the increasing content of sulfonic acid groups and sodium salts. The peak in various ionomers

which characterizes the structure of clusters of ionic aggregates

was not observed in the pattern of small angle X-ray scattering. It is shown that only multiplets of group of a few tightly bound ion paire exist. IR spectra indicate the presence of the O=S=O symmetrical and asymmetrical stretch peaks at 1040 and 1200cm-1.The 1H-NMR experiments indicated that sulfonic acid groups mainly react with the side chain double bonds of 3

4-polyisoprene.