posted on 2023-01-09, 13:05authored byQing Li, Yujuan Guo, Shunmin Yi, Zushun Xu, Wengui Duan, Sheng Liu
Natural marine sepia eumelanin-derived additives (ASE)
were used
as a filler to modify highly fluorinated polyimide (FPI), acquiring
the enhanced comprehensive performance by chemical bonding and pore
structure construction. Stress–strain curves indicated an optimal
tensile strength of 108.25 MPa and a fracture elongation of 4.83%
(1 wt % ASE), respectively, 1.30 and 1.34× that of pure FPI.
Thermal analysis showed that Tg was as
high as 360.1, 14.4 °C higher than that of pristine FPI. The
exceptional UV-shielding capabilities of the FPI/ASE films were confirmed
by measurements of curcumin photodegradation, durability, and so on.
FTIR and AFM manifested their superior photostability with basically
unchanged carbonyl absorption peaks and much less variation in surface
roughness after UV exposure for 720 h. To sum up, the covalent network
structure between FPI and ASE contributed to the improvement of mechanical
and thermal properties. The mechanisms, such as synergistic UV absorption
of FPI and ASE, photothermal conversion, and ASE’s free radical
trapping ability, were responsible for the remarkable UV-shielding
and light stability. The above remarkable comprehensive performance
makes the FPI/ASE film a candidate for UV shielding in aerospace applications.