ATR-FTIR方法判断PA6/PA66共混物中两组分相对含量
ATR-FTIR method for determining the relative content of two components in PA6/PA66 blends
唐承浩 1李齐添 1冼业明 1郭振炼 1汪炉林1
作者信息
- 1. 广州市聚赛龙工程塑料股份有限公司,广州 510945
- 折叠
摘要
尼龙(PA)66与PA6都是应用极其广泛的工程塑料,在面对不同的性能要求、加工要求、成本要求时往往会将PA6与PA66共混后使用.共混后的材料后续的回收改性有一定困难,需要找到一个相对简便的方法快速对PA共混物中的共混比例进行分析.采用衰减全反射傅里叶变换红外光谱(ATR-FTIR)分析了不同比例PA6/PA66共混物的峰位与峰形的差异.试验结果表明,不同比例共混物的红外光谱图在1 300～4 000 cm-1范围内的峰位和峰形与共混物共混比例相关性不大,而在1 169～1 180 cm-1处吸收峰峰位置随共混比例变化相关性较大,可作为成分分析判据.将1 169～1 180 cm-1处吸收峰峰位置和共混物中PA6含量进行作图拟合,拟合结果发现,峰位随着PA6含量增加的变化相关性函数一开始变化程度平缓,在1 172 cm-1到1 178 cm-1位置处发生突变,后续变化又变小,相关系数达0.980 76.后续用预处理试样进行测试,发现测试与实际共混比例相差在5%左右,可作为半定量分析.使用该方法可快速对未知PA6/PA66共混物样品进行红外光谱分析确定PA6和PA66的相对比例.
Abstract
Polyamide 66(PA66)and PA6 are both widely used engineering plastics.When facing different performance,processing,and cost requirements,nylon 66 is often blended with nylon 6 for application.There are certain difficulties in the subse-quent recycling and modification of the blended material,and a relatively simple method needs to be found to quickly analyze the blending ratio in nylon blends.The differences in peak positions and shapes of PA 6/PA 66 blends with different ratios were analyzed using attenuated total reflection fou-rier transform infrared spectroscopy(ATR-FTIR).The results show that the peak posi-tions and shapes of infrared spectra of blends with different proportions in the range of 1 300-4 000 cm-1 have little correlation with the blending ratio of the blend,while the absorption peak positions at 1 169-1 180 cm-1 have a significant correlation with the varia-tion of blending ratio,which can be used as a criterion for component analysis.The fitting results show that the correlation function of peak position with the increase of PA6 content initially changes smoothly,with a sudden change at positions 1 172 cm-1 to 1 178 cm-1,and subsequent changes decreases,with a correlation coefficient of 0.980 76.Using pre-treated samples for testing,it is found that the difference between the tested and actual blending ratios is about 5%,which can be used as a semi quantitative analysis.This method can quickly perform infrared spectroscopic analysis on unknown PA6/PA66 blend samples to determine the relative propor-tions of PA6 and PA66.
关键词
尼龙6/尼龙66/红外光谱/衰减全反射/定量分析Key words
polyamide 6/polyamide 66/infrared spectrum/attenuated total refraction/quantitative analysis引用本文复制引用
出版年
2024
NETL
NSTL
万方数据