The effect of different sulfonation degree on properties of sulfonated syndiotactic polystyrene (SsPS) was investigated by 1H-NMR

13CNMR

FTIR

DSC and WAXD．The results of 13C-NMR showed that a peak at δ=145.5 appeared in all SsPS spectra．which proved that the syndiotactic structure of syndiotaetic polystyrene(sPS) still eximed in SsPS．With increasing degree of sulfonition。the chemical shifts of C-1 and C-3 for sulfonated benzene ring turned out to be wider．1H-NMR spectra showed that C-3 for sulfonated benzene ring had a chemical shift of 7．66．FTIR spectra showed that sulfonic acid groups were introduced on the para position of benzene rings and with increasing sulfonation degree

the absorption strength of 612／1600 cm-1

834／1600cm-1 increased

but the absorption strength of 1078／1600cem-1 decreased．The absorption of ～1030cm-1

～1179cm-1

～1217cm-1

appeared when the sulfonation degree was higher that 6％．sPS and SsPSH-2．2 had absorption at 975 and 943cm-1 and also had doubh peaks around～1175cm-1；DSC showed that with increasing sulfonation degree

the glass transition temperature increased

the melt temperature

crystallization temperature and crystallization degree decreased；SsPS eouldn’t crystallize when sulfonation degree was higher that 6mol％；WAXD proved that sPS had the a and βcrystal types

however

SsPS with 2．2％ sulfonation degree only had the β crystal type

and SsPS with 6．1％ sulfonation degree didn’t crystallize．