Nine N,N diacyl adipic dihydrazides were synthesized. The compounds all exhibited remarkable inhibiting effects on the aging of polypropylene(PP) contacted with copper and their metal deactivation activity was increased with increase in their molecular weight. They didnt reduce the mechanical property of PP. The most effective were N,N dihexanoyl adipic dihydrazide and N,N dioctanoyl adipic dihydrazide. At 150 ℃ their aging periods for PP film were over 510 hours.
Notable features of EIMS cleavage for eight N,N diacyl adipyl dihydrazides are summarized. The sources and chemical structures of the main fragments are interpreted. All of the eight compounds give the base peak of m/z 143. The main fragments are from the α cleavage and its rearranging ones at the carbonyl gronp.
