关键词: 推进剂;老化性能;定应变;界面黏结;黏附功

Abstract: To investigate the main failure reason of HTPB propellant under constant strain,the macroscopical mechanical property,microscosmic interfacial properties and their relationship were studied.The macroscopical mechanical properties were measured by uniaxial tensile testing.The microscosmic interfacial adhesive properties were characterized using Scanning Electron Microscope(SEM) and measuring the contact angle between the test liquids and filler AP or binder matrix.The results show that the maximum elongation are decreased,the interfacial adhesive between the filler and binder matrix are deteriorated,the work of adhesion(Wa) are decreased and the interfacial tension(γsl) increased along with the aging time.The interfacial adhesive property between the filler and binder matrix of HTPB propellant can be characterized by Wa and γsl.The value of the work of adhesion under constant strain is lower,and the interfacial tension is higher than that under zero strain.The existence of the constant strain has influenced the interfacial adhesive between the filler and binder matrix badly.The result shows that there is linear correlation between the maximum elongation and the work of adhesion.The decline of the maximum elongation is caused by the deterioration of the interfacial adhesive property.

Key words: Propellant;Aging property;Constant strain;Interfacial adhesive;Work of adhesion