Excellent stabilization of polypropylene (PP) fibers exposed to sterilization levels of gamma radiation, is obtained with a hybrid stabilizer having a N-(substituted)-1-(piperazin-2-one alkyl) group at one end and a (3,5-dialkyl-4-hydroxyphenyl)-α,α-disubstituted acetamide at the other. When this hybrid of a hindered amine with a hindered phenol is combined through a disubstituted alpha carbon atom of the acetamide in a single molecule, it affords the advantages of each group with respect to its stabilization against oxidation, but without the known inherent disadvantages of either group. This molecule is N-(substituted)-1-(piperazin-2-one alkyl)-α-(3,5-dialkyl-4-hydroxyphenyl)-α,α-substituted acetamide molecule ("3,5-DHPZNA" for brevity). The unexpected retention of tensile strength in 3,5-DHPZNA stabilized PP fibers used in articles exposed to a sterilizing dosage level of gamma radiation, is of great practical value.
一种混合稳定剂的一端是 N-(取代)-1-(
哌嗪-2-酮烷基)基团,另一端是(3,5-二烷基-
4-羟基苯基)-α,α-二取代乙酰胺,使用这种混合稳定剂可使暴露在伽马射线消毒
水平下的聚
丙烯(PP)纤维获得极佳的稳定效果。当这种受阻胺与受阻
酚的混合物通过乙酰胺的二取代α碳原子结合在一个分子中时,它具有每个基团在抗氧化稳定性方面的优点,但没有已知的任一基团固有的缺点。这种分子就是 N-(取代)-1-(
哌嗪-2-酮烷基)-α-(3,5-二烷基-
4-羟基苯基)-α,α-取代乙酰胺分子(简称 "3,5-
DHPZNA")。3,5-
DHPZNA 稳定聚
丙烯纤维意外地保持了拉伸强度,用于暴露在伽马射线灭菌剂量
水平下的物品,具有极大的实用价值。