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

作　　者：唐承浩 李齐添 冼业明 郭振炼 汪炉林 TANG Chenghao;LI Qitian;XIAN Yeming;GUO Zhenian;WANG Luin(Guangzhou Super-Dragon Engneering Plastics Co.,Ltd.,Guangzhou 510945,China)

机构地区：[1]广州市聚赛龙工程塑料股份有限公司,广州510945

出　　处：《工程塑料应用》2024年第3期140-145,共6页Engineering Plastics Application

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1300~4000 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1169~1180 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1169~1180 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1172 cm^(-1)到1178 cm^(-1)位置处发生突变,后续变化又变小,相关系数达0.98076。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。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 subsequent 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 positions and shapes of infrared spectra of blends with different proportions in the range of 1300-4000 cm^(-1)have little correlation with the blending ratio of the blend,while the absorption peak positions at 1169-1180 cm^(-1)have a significant correlation with the variation 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 1172 cm^(-1) to 1178 cm^(-1),and subsequent changes decreases,with a correlation coefficient of 0.98076.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 proportions 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 

分 类 号：TQ322.3[化学工程—合成树脂塑料工业] O657.33[理学—分析化学]