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通过差示扫描量热仪(DSC)和热失重分析仪(TGA)测定了二氢杨梅素(DMY)的热稳定性。测定了添加DMY的不同高分子材料的氧化诱导温度(OIT*),并与添加相同质量分数工业抗氧剂Irganox B215的样品进行了比较。实验结果表明,DMY在230℃以下稳定性良好,可用于加工温度低于230℃的各种高分子材料的加工过程,添加DMY的各种高分子材料的抗氧化性能优于添加Irganox B215的样品。对其抗氧化作用机理分析表明,DMY的特殊结构,特别是分子中羟基的数量和位置是其具有强抗氧剂性的根本原因。DMY无毒、高效,有望作为新型天然抗氧剂得到广泛应用。
Thermal stability of dihydromyricetin (DMY) was measured by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The oxidation induction temperature (OIT *) of different polymeric materials with DMY was measured and compared with the samples with the same antioxidant (Irganox B215). The experimental results show that the DMY has good stability below 230 ℃ and can be used in the processing of various polymer materials with the processing temperature lower than 230 ℃. The anti-oxidation performance of various DMY-added macromolecule materials is better than that of Irganox B215 . Analysis of its mechanism of anti-oxidation showed that the special structure of DMY, especially the number and location of hydroxyl groups in the molecule is the root cause of its strong antioxidant properties. DMY non-toxic, efficient, is expected to be widely used as a new natural antioxidant.