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本文提出苯乙烯-顺丁烯二酸共聚物的磺酸盐(SSMA)中磺酸基的测定方法。将SSMA与KOH在340℃共熔进行磺基碱解,所分解的SO_3~(2-)氧化为SO_4~(2-)后用过量Ba~(2+)予以沉淀,剩余Ba~(2+)用K_2CrO_4,进行交流示波极谱滴定,以间接求得磺酸基含量。
This paper presents a method for the determination of sulfonic acid groups in sulfonate (SSMA) of styrene-maleic acid copolymer. The basic sulfitation of SSMA and KOH is carried out at 340 ℃, the decomposed SO_3 ~ (2-) is oxidized to SO_4 ~ (2-) and precipitated with excess Ba ~ (2+) ) With K_2CrO_4, AC oscillopolarographic titration to indirectly determine the content of sulfonic acid groups.