利用380FTIR型红外光谱研究了聚苯乙烯与氯磺酸在不同时间及投料比条件下的氯磺化反应。 以1　601.5　cm-1苯环特征峰作为内标峰， 1　377.4与3　476.8　cm-1处的磺酰氯和磺酸特征峰作为参比峰， 以朗伯-比耳定律为理论依据， 利用红外光谱法测定了特征频率强度A， 将 A1　377.4和A3　476.8与A1　601.5进行比较， 并以A1　377.4∶A3　476.8的大小表示聚苯乙烯磺酰氯树脂均一性的高低。 结果表明： (1)当反应1　h之后A1　377.4∶A3　476.8随时间的延长而增大。 (2)在投料比为1∶1之前， A3　476.8∶A1　601.5随投料比的增大而增大， 之后则随投料比的增大而减小， 同时出现了磺酰氯吸收峰且A1　377.4∶A1　601.5随投料比逐渐增大， 在4∶1之后A1　377.4∶A1　601.5与A3　476.8∶A1　601.5呈现稳定。 在一步法反应条件下， 当投料比为4∶1时， 反应5　h， 可获得均一性较好的聚苯乙烯磺酰氯树脂 (磺酰氯的担载量为4.0　mmol·g-1)。 结果证明红外光谱法可方便、 快捷地检测聚苯乙烯磺酰氯树脂的均一性， 具有一定的实用性及推广性。

The reactions of polyvinyl benzene with chlorosulfonic acid were performed under different ratio and reaction time and the results of chloro-sulfonation were detected by infrared spectrometer (380FT-IR). The characteristic peak at 1 601.5 cm-1 belongs to benzene ring and was selected as the internal standard peak. Two characteristic peaks at 1 377.4 and 3 476.8 cm-1 were selected as reference peaks, and belong to sulfonyl chloride and sulfonic group respectively. According to the Lambert-Beer law, the absorbance at 1 377.4 and 3 476.8 cm-1 was detected and compared with absorbance at 1 601.5 cm-1 respectively. The value of A1 377.4∶A3 476.8 was used to express uniformity of polystyrol sulfonyl chloride resins. The results show that: (a) After 0.5 h, A1 377.4∶A1 601.5 rises quickly with the prolonging of reaction time; and A3 476.8∶A1 601.5 rises too，but descends after 1 h. And the value of A1 377.4∶A3 476.8 rises with the prolonging of reaction time after 1 h. (b) When the ratio of HSO3Cl and PS is less than 1∶1, A3 476.8∶A1 601.5 rises with the ratio increasing, but when the ratio of HSO3Cl and PS is more than 1∶1, A3 476.8∶A1 601.5 descends while A1 377.4∶A1 601.5 appears and increases following the increase in the ratio. As the ratio was 4∶1, A1 377.4∶A1 601.5 and A3 476.8∶A1 601.5 show stabilization. In one step reaction condition, as the ratio of HSO3Cl and PS is 4∶1, the reaction can enhance uniformity of PS-SO2Cl at 60 ℃ for 5 h (the loading of sulfonyl chloride is 4.0 mmol·g-1). It was also confirmed that the function group uniformity of polystyrol sulfonyl chloride resins could be determined by infrared spectroscopy conveniently and quickly. Meanwhile, this method could be adopted to determine the function group uniformity practicably and widely.