红外光谱法测定固相微萃取新型吸附质中单体的摩尔比

以丙烯酸丁酯和苯乙烯为单体 ,过氧化苯甲酰为引发剂 (用量为wt 0 3% ) ,醋酸丁酯和甲苯作混合溶剂 ,溶剂用量与单体混合物的体积相同 ,采用溶液聚合的方法合成了一种新型固相微萃取吸附质 (苯乙烯 丙烯酸丁酯共聚物 )。以朗伯 比耳定律为依据 ,通过一系列的推导过程 ,得出了共聚物中两种官能团的吸收值比与共聚物中两种单体摩尔比的线性关系式A1 /A2 =kn1 /n2 。采用红外光谱法测定聚合物中两种官能团的吸收值比 ,再通过外标曲线法确定了共聚物中两种官能团的吸收值比 (y)与共聚物中两种单体的摩尔比 (x)的线性回归方程 y =0 136 2 0 0 84 1x。方法的精密度RSD(% ) =2 4 6 4 ,方法的回收率为 92 89%～10 3 94 %。红外光谱法测定作为固相微萃取新型吸附质的苯乙烯与丙烯酸丁酯共聚物中单体的摩尔比是一种快速准确的分析方法

Determing Mole Ratio of Monomers in New Adsorbent of Solid-phase Microextraction by Infrared Spectroscopy

In the present paper, butyl acrylate and phenylethylene were used as monomers, benzoyl peroxide as evocator, n-butyl acetate and methylbenzene as solvent, a new type of solid-phase micro extraction adsorbent that is phenylethylene-butyl acrylate copolymer was synthesized by solution polymerization. The polymer has good behaviour for adsorbing arenas. According to Lambert-Beer law and some calculation process, the linear relation between the absorptance (y) of the two functional groups, which are benzene and ester, and the two monomers' mole ratio (x) was obtained. The absorptances were determined by IR. The standard curve was obtained by external standard method. The linear regression equation is y=0.136 2 0.084 1x. The precisions and recoveries were investigated. RSD is 2.464%, and recoveries are 92.89%-103.94%. The results are satisfactory. This method is rapid and accurate.