超支化桥联受阻酚在聚乙烯中的抗氧化性能研究

Antioxidant Properties of Hyperbranched Bridged Hindered Phenols in Polyethylene Resins

以低代超支化大分子和β-(3,5-二叔丁基-4-羟基苯基)丙酰氯为原料,合成了一端具有长链烷基、另一端具有两个受阻酚结构单元的新型超支化桥联受阻酚。采用红外光谱和核磁共振氢谱对合成的超支化桥联受阻酚进行了结构表征,重点研究了超支化桥联受阻酚在两类聚乙烯中的加王稳定性和热氧稳定性.结果表明,合成的两种超支化桥联受阻酚的化学结构与其设汁的理论结构相一致,在两种聚乙烯中均有良好的加工稳定性和抗氧化性能,其性能优于具有类似结构的单酚抗氧剂1076;且随着端基烷基链的增长,在两种聚乙烯中的加工稳定性和抗氧化能力增加;超支化桥联受阻酚在高密度聚乙烯中的抗氧化性能略优于其在线形低密度聚乙烯中的抗氧化性能。

Novel hyperbranch bridge hindered phenols （HBHP） were synthesized from β-（3, 5- diterbutyl-4-hydroxyphenyl） propionyl chloride and low generatioh hyperbranched macromolecule, and the products were characterized by FTIR and ^1H-NMR. And the processing stability and thermal oxidative stability of HBHPs in two polyethylene resins were investigated. HBHP provided excellent processing stability and antioxidant property for polyethylene, and their antioxidant function was superior to that of antioxidant 1076. Moreover, the antioxidant function of HBHP in two polyethylene resins increased with increasing of the length of alkyl chain. The antioxidant properties of HBHP in PE-HD were slightly better than those in PE-LLD.