基于ATR-FTIR的航空丁腈橡胶鉴别研究

Identification of Aeronautical Nitrile Rubbers Based on ATR-FTIR

以航空丁腈橡胶为研究对象,分析衰减全反射傅里叶变换红外光谱(ATR-FTIR)鉴别丁腈橡胶的理论依据。橡胶试样经无水乙醇萃取、干燥和图谱定量后,统计分析多种牌号航空丁腈橡胶氰基(—C≡N)与—CH=CH_(2)吸收峰的吸光度比R_(2237/967)值与生胶丙烯腈含量的半定量对应关系。结果表明:丁腈−18的R_(2237/967)值为0.089~0.095;丁腈−18+丁腈−26混用橡胶R_(2237/967)值为0.146~0.149;丁腈−40的R_(2237/967)值约为0.224;生胶丙烯腈含量越高,R_(2237/967)值越大,可依据R_(2237/967)值对航空丁腈橡胶作进一步鉴别。

Aeronautical nitrile rubber(NBR)was taken as the research object.The theoretical basis for identification of NBRs by ATR-FTIR was analyzed.The rubber samples were extracted by absolute ethyl alcohol,dried and quantitatively analyzed by spectrum.Then for different aeronautical NBRs,the semi-quantitative corresponding relationship between the absorbance ratio R_(2237/967) of—C≡N absorption peak to—CH=CH_(2) absorption peak and the content of acrylonitrile was statistically analyzed.The results show that the R_(2237/967) range of nitrile-18 NBR is 0.089~0.095,the R_(2237/967) range of the mixture of nitrile-18 NBR and nitrile-26 NBR is 0.146~0.149,and the R_(2237/967) range of nitrile-40 NBR is about 0.224.The higher the content of acrylonitrile is,the greater the R_(2237/967) is.NBRs can be further identified according to R_(2237/967).