脂肪二胺桥联受阻酚的桥联基与抗氧化性能的关系研究

Relationship Between Bridged Group and Antioxidation of Aliphatic Diamine Bridged Hindered Phenol

以系列脂肪二胺为桥联基,3-(3,5-二叔丁基-4-羟基苯基)丙酸甲酯为原料,合成了系列脂肪二胺桥联受阻酚。采用傅里叶变换红外光谱和核磁共振氢谱对合成的系列受阻酚进行了结构表征,研究了脂肪二胺桥联受阻酚的桥联基与其在聚烯烃树脂中抗氧化性能和耐热氧化性能的关系。结果表明,脂肪二胺桥联受阻酚在2种聚烯烃材料中均具有良好的加工性能、耐热氧化性能和抗氧化性能,且随着桥联基碳数的增加,抗氧化性能、耐热氧化性能、加工稳定性和力学性能均增强;合成的抗氧剂1098的性能略优于市售抗氧剂1098的性能;脂肪二胺桥联受阻酚在线形低密度聚乙烯(PE-LLD)中的抗氧化性能优于聚丙烯(PP)。

Series of hindered phenols were synthesized using 3-(3,5-diterbutyl-4-hydroxyphenyl)methyl propionate as a raw material and aliphatic diamine as a bridge group.The obtained phenols were characterized by Fourier transform infrared spectrometer(FTIR)and 1 H-nuclear magnetic resonance(1 H-NMR).The effect of the bridged group on the antioxidation of hindered phenols was studied.It showed that the bridge group rendered the material excellent processing property,thermal oxidative resistance,and mechanical properties.All those properties were enhanced with increasing carbon number of the bridge group.The effect of the bridge group in PE-LLD was more obvious than that in PP.