傅里叶变换红外光谱法测定苯乙烯-异丁烯酸甲酯共聚物中苯乙烯单元含量  

FT-IR Spectrometric Determination of Styrene Monomer in Copolymer of Styrene and Methylmethacrylate

作　　者：俞雄飞[1] 林振兴[1] 莫卫民[2] 

机构地区：[1]宁波出入境检验检疫局,宁波315012 [2]浙江工业大学化材学院,杭州310005

出　　处：《理化检验（化学分册）》2009年第3期267-269,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：取0．013g共聚物样品，用压片机在压力30MPa和温度（150±10）℃的条件下压制成厚度为0．05mm的样品膜供傅里叶变换红外光谱法分析用。根据苯乙烯-异丁烯酸甲酯共聚物的红外光谱特征性，分别选择波数700cm叫和1730cm叫作为苯乙烯和异丁烯酸甲酯的定量峰位。选用已知苯乙烯单元的共聚物样品，按方法分析并测得相关数据。以苯乙烯单元的质量分数（％）作为纵坐标，以特征峰面积比值（A700／A1730）为横坐标制作标准曲线。根据所测得未知样品的A700／A1730比值，在标准曲线上查得其苯乙烯单元的含量。该法测定聚合物中苯乙烯单元的范围为40％～85％。测得不同苯乙烯单元含量样品的相对标准偏差（n=6）为0．9％～1．9％。将红外光谱法分析结果与核磁共振法分析结果进行比较，相对误差在2％以内。Sample film of thickness of 0. 05 mm was made with 0. 013 g of the sample by the film-forming press under a working pressure of 30 MPa at （150±10）℃. In the IR-speetrometric determination of styrene monomer in the copolymer of styrene （SR） and methyl methacrylate （MMA）, based on the m-spectroscopic property of the copolymer, wavenumbers of 700 cm-1 and 1 730 cm-1 were selected as the peak positions for analysis. Copolymer samples with known contents of styrene monomer was used for preparation of standard curve, taking the contents （in %） of styrene monomer as the ordinate and values of ratio of characteristic peak area, AToo/ A~ 730, as the abscissa. Content of styrene monomer in unknown sample was found from the standard curve with the value of the ratio A700/A1730 measured. Range of determination of this method was found over the range 40%-85% of styrene monomer. Values of RSD＇s （n=6） found by this method were in the range of 0. 9%--1.9%. Relative deviation within 2 % were obtained between results of the present method and the 13C NMR method.

关 键 词：傅里叶红外光谱法 苯乙烯-异丁烯酸甲酯共聚物 苯乙烯单元含量 

分 类 号：O657.33[理学—分析化学]