磺化间规聚苯乙烯的表征

间规聚苯乙烯(sPS)是一种新型结晶性工程塑料，熔点达270℃，具有结晶速度快、耐热性好、耐化学腐蚀性优良等特点，可广泛用于汽车、电子、机械等行业，极具开发意义，但是由于sPS脆性大，抗冲击性差，故通过化学改性在sPS的苯环上引入极性基团，用于制成共混合金与复合材料，是提高材料韧性，开拓sPS用途的重要途径。

CHARACTERIZATION OF SULFONATED SYNDIOTACTIC POLYSTYRENE

The effect of different sulfonation degree on properties of sulfonated syndiotactic polystyrene(SsPS) was investigated by 1H-NMR，13C-NMR，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 syndiotactic polystyrene(sPS) still existed 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 1078/1600cm-1 decreased.The absorption of ～1030cm-1,～1179cm-1,～1217cm-1 appeared when the sulfonation degree was higher that 6%.sPS and SsPS-H-2.2 had absorption at 975 and 943cm-1 and also had double 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 couldn't crystallize when sulfonation degree was higher that 6mol%;WAXD proved that sPS had the α and β crystal types, however,SsPS with 2.2% sulfonation degree only had the β crystal type, and SsPS with 6.1% sulfonation degree didn't crystallize.