苯乙烯-马来酸酐共聚物中酸酐含量测定方法研究

Study on the Anhydride Content in Styrene-Maleic Anhydrid Copolymers

苯乙烯-马来酸酐共聚物(SMA)分子结构中含有酸酐官能团,易于化学改性得到新型功能高分子,在生物以及化学方面均表现出优异特性,而酸酐含量是影响其性能的重要因素,因此必须准确分析共聚物中酸酐含量。本文首先对SMA水溶液进行pH值滴定,确定了SMA在pH值突跃范围内以一元羧基/一元羧酸钠的形式存在,利用微商法确定该范围内pH滴定终点,建立了一种简便、快速确定酸酐含量的pH值滴定方法,并经元素分析验证了该方法测定结果的准确性。

Styrene-maleic anhydride copolymer is a synthetic copolymer with interesting teatures from both the chemical and the biological points of view. The proportion of maleic anhydride is an important factor that influences its function. The structure of styrene-maleic anhydride copolymer was determined to be monocarboxyl/monocarboxylic salt by potentiometric and conductometric titration. The titration end point was determined by derivative method. A simple and speed potentiometric titration method was established according to that. This method was proved precise by element analysis.