Fig. 4: Mechanical performance of PI aerogels.
From: Super-elasticity at 4 K of covalently crosslinked polyimide aerogels with negative Poisson’s ratio
a Optical image of a PI aerogel’s recovery after 180° bending and 99% compression. b Compressive stress-strain curves with 70% strain of PI aerogels with different cross-linking degrees. c Compressive stress-strain curves with 99% strain and residual strain of PI aerogels with different cross-linking degrees. d Comparison of ultimate recoverable strains and densities of PI-10 aerogels with reported polymeric aerogels. e Simulated results of local stress distribution in cellular PI aerogels. f In-situ sequential SEM images of microstructure in PI-10 aerogels with different strains. g Fatigue test curves and SEM images of PI-10 aerogels before and after fatigue test of 5000 cycles.
