Residual stress effect on degradation of polyimide under simulated hypervelocity space debris and atomic oxygen

Polyimides are used as the outer layer of thermal control insulation blankets covering most of the external spacecraft surfaces that are exposed to space environment. The combined effect of ground simulated hypervelocity space debris impacts and atomic oxygen (AO) on the fracture of polyimide films was studied. A laser-driven flyer system was used to accelerate aluminum flyers to impact velocities of up to 3 km/s. The impacted films were exposed to an RF plasma source, which was used to simulate the effect of AO in the low Earth orbit. Scanning electron microscopy and atomic force microscopy were used to characterize the fracture and surface morphology. When exposed to oxygen RF plasma, the impacted polyimide film revealed a large increase in the erosion rate, the damage being characterized mainly by the formation of new holes. This effect is explained by the formation of residual stresses due to the impact and enhancement of oxygen diffusivity and accumulation. A complementary experiment, in which a stressed polyimide was exposed to RF plasma, supports this model. This study demonstrates a synergistic effect of the space environment components on polymers' degradation, which is essential for understanding the potential hazards of ultrahigh velocity impacts and AO erosion for completing a successful spacecraft mission.

[1]  Y. X. Wang,et al.  Nuclear Instruments and Methods in Physics Research Section B : Beam Interactions with Materials and Atoms , 2018 .

[2]  J. R. White,et al.  Photo-oxidation of polystyrene under load , 1994, Journal of Materials Science.

[3]  Y. Cohen,et al.  Simulated Low Earth Orbit Environment Interaction with Different Types of Polyethylene , 2004 .

[4]  Chuanglong He,et al.  High Performance Polymers , 2002 .

[5]  T. Wydeven,et al.  Reactions of atomic oxygen (O/3P/) with various polymer films , 1988 .

[6]  D. R. Tyler.  Mechanistic Aspects of the Effects of Stress on the Rates of Photochemical Degradation Reactions in Polymers , 2004 .

[7]  M.Raja Reddy,et al.  Effect of low earth orbit atomic oxygen on spacecraft materials , 1995 .

[8]  M. S. Edward.  Space Environmental Effects on Spacecraft: LEO Materials Selection Guide , 1995 .

[9]  Timothy K. Minton,et al.  DYNAMICS OF ATOMIC-OXYGEN-INDUCED POLYMER DEGRADATION IN LOW EARTH ORBIT , 2001 .

[10]  Shalom Eliezer,et al.  BOOK REVIEW: The Interaction of High-Power Lasers With Plasmas , 2002 .

[11]  Journal of Applied Polymer Science , 1959, Nature.

[12]  M. Wertheimer,et al.  MeV proton irradiations and atomic oxygen exposure of spacecraft materials with SiO2 protective coatings , 1997 .

[13]  J. Stark,et al.  Direct simulation of meteoroids and space debris flux on LDEF spacecraft surfaces , 2001 .

[14]  D. Hastings,et al.  Spacecraft–Environment Interactions: Index , 1996 .

[15]  B. Jang,et al.  The mass loss mechanisms of polymers in a radio frequency induced atomic oxygen environment , 1993 .

[16]  F. Beckmann,et al.  The effect of simulated hypervelocity space debris on polymers , 2004 .

[17]  E. Grossman,et al.  Space environment effects on polymers in low earth orbit , 2003 .

[18]  Zhi-gang Shen,et al.  A study of the reaction characteristics and mechanism of Kapton in a plasma-type ground-based atomic oxygen effects simulation facility , 2001 .

[19]  I. Gouzman,et al.  Assessment of Atomic-Oxygen Flux in Low-Earth-Orbit Ground Simulation Facilities , 2004 .

[20]  B. Flaconneche,et al.  Transport Properties of Gases in Polymers: Bibliographic Review , 2001 .

[21]  C. Wert.  Hydrogen in Metals , 1999 .

[22]  Henry Eyring,et al.  Hydrogen in metals , 1948 .

[23]  M. Gusarova,et al.  Nuclear Instruments and Methods in Physics Research , 2009 .

[24]  S. Koontz,et al.  Atomic oxygen testing with thermal atom systems - A critical evaluation , 1991 .

[25]  Joseph L. Stecher,et al.  Nineteenth Space Simulation Conference Cost Effective Testing for the 21st Century , 1997 .

[26]  F. C. Larcht'e,et al.  The effect of self-stress on diffusion in solids , 1982 .