聚乙烯薄膜中芥酸酰胺的测定及其稳定性研究

目的测定低密度聚乙烯中芥酸酰胺的含量,并研究芥酸酰胺经紫外照射和高温处理后的稳定性。方法采用二甲苯溶解薄膜,经离心、氮吹、甲醇复溶提取其中的芥酸酰胺,用高效液相色谱测定其含量;采用紫外照射和高温处理芥酸酰胺,利用高效液相色谱、气相色谱-质谱和傅里叶红外光谱研究芥酸酰胺标准品的稳定性。结果芥酸酰胺在2~100μg/m L范围内线性良好,相关系数R0.999,方法检出限为0.6μg/m L,定量限为2.0μg/m L,加标回收率为98.6%~112.3%,相对标准偏差为5.6%~8.6%。紫外照射和高温处理芥酸酰胺没有产生新的化学键,其含量也没有明显减少。结论高效液相色谱法测定芥酸酰胺具有较好的稳定性和灵敏度,芥酸酰胺在高温、紫外处理后较稳定,不易发生降解等化学反应。

Determination of Erucamide in Polyethylene Films and Its Stability

The work aims to determinate the content of erucamide in low density polyethylene and study the stability of erucamide after ultraviolet radiation and high temperature treatment. The erucamide was extracted from the xylene dissolving films after several procedures like centrifugation, nitrogen blowing and methanol re-dissolving, and its content was measured by high performance liquid chromatography. The erucamide was subject to ultraviolet radiation and high temperature treatment. The stability of standard erucamide was studied by HPLC, gas chromatography-mass spectrometry and Fourier transform infrared spectroscopy. The erucamide had good linearity in the range of 2~100 µg/mL with a correlation coefficient R>0.999. The detection limit and the limit of quantitation of the method were 0.6 µg/mL and 2 µg/mL, respectively. The added recovery was at 98.6%~112.3% and the relative standard deviation was at 5.6%~8.6%. No new chemical bond was found in the erucamide after ultraviolet radiation and high temperature treatment, and the content of erucamide was not significantly reduced, either. Determination of erucamide by means of HPLC has good stability and sensitivity. After high temperature treatment and ultraviolet radiation, the erucamide is more stable and chemical reactions like degradation hardly occur.