Characterization of HTPBs for aerospace applications

The authors provided detailed information on the test facility and method of testing at the JAXA test facility. 

The AO irradiation was performed using the laser detonation facility with fluence equivalent to three months exposure on 400 km altitude 

The proton irradiation tests were carried out in a Tandem accelerator under vacuum (P 2.6x10 Pa) with the energy of 2.6 MeV an irradiation dose of 63 MGy reduced the elongation at break of PI by around 50 % of initial value. 

A Cockcroft-Walton accelerator was used for the electron irradiation under vacuum (P 7.9x10 Pa) with accelerating potential of 200-500 kV. After the dose of 20 MGy, the decrease of elongation at break was comparable to that of proton irradiation. 

Mechanical testing was performed on epoxy resin toughened by incorporation of up to 17 vol% of PEI.1 The dynamic mechanical tests were carried out in DMTA at 10 Hz, in a single cantilever bending mode at r = -80 to 300°C. The flexural properties at 23°C were carried 

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