Study on Aging Property of FX-17 Fluororubber in Damp Heat Environment
The aging behavior of FX-17 fluororubber in damp heat environment is studied,which provides theoretical support for evaluating the adaptability of fluororubber seal structure in damp heat environment.The damp heat test is carried out according to GJB 150.9A-2009"Laboratory environmental test methods for military material-part 9:damp heat test",the aging performance of FX-17 fluororrubber in damp heat environment is studied by scanning electron microscope observation,infrared spectrum analysis and mechanical properties test.The results show that the tensile strength and elongation at break of FX-17 fluoroprene show a trend of increasing first and then decreasing during 100 days of damp heat test,while the hardness and compressive permanent deformation fluctuate with the extension of the test period,but there is only a little difference between the test properties and the initial properties.After 100 days of damp heat test,granular material precipitateds on the surface of FX-17 fluororubbers,but the fracture surface of tensile specimens still maintains good fracture toughness characteristics.The main functional group structure of FX-17 fluororubber remains stable,but a small number of free groups such as carbon-carbon double bond,-CH2 and hydroxyl structure are formed.In general,the influence of damp heat environment on the mechanical properties and functional group structure of FX-17 fluororubber is small.
fluororubberdamp heat environmentagingmechanical propertyfunctional group
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