基于红外光谱的涤/棉混纺比定量分析

Quantitative determination on blend ratio of polyester/cotton by FTIR

为了进行红外光谱定量分析纤维含量的研究,测试了涤纶、棉和不同比例涤/棉混合物的红外光谱图,探讨了红外光谱定量分析涤/棉混纺比的方法。研究表明,2 900、1 717、721 cm-1特征吸收峰面积与涤/棉混合物中涤纶含量的线性关系不明显。以上述3个特征吸收峰面积为参量,构建了6个特征值,其中4个特征值与涤/棉混合物中涤纶含量的线性相关性较好。验证实验表明,第6个特征值与涤纶含量的线性相关性最好,利用该特征值与涤纶含量的线性方程可确定涤/棉混合物中涤纶的含量。

In order to quantitatively analyze fiber content by FTIR,the infrared absorption spectra of polyester,cotton and polyester/cotton blends were measured,and the method for quantitative determination on blend ratio of polyester/cotton by FTIR was discussed.The results show that the linear relationship between the absorption peak areas of（2 900 cm^（-1））,（1 717 cm^（-1））,（721 cm^（-1）） and polyester content in the polyester/cotton blends are not very clear.Six characteristic parameters are constructed from the three absorption peak areas,four of which have good linear relationship with the polyester content.Further demonstration tests show that the linear relationship between the sixth characteristic parameters and the polyester content is the best,and the derived linear equation can be used to determine the polyester/cotton blend ratio.