Surface modification of nano-silica by diisocyanates and their application in polyimide matrix for enhanced mechanical, thermal and water proof properties

The Synergistic Effects of Sio2 Nanoparticles and Organic Photostabilizers for Enhanced Weathering Resistance of Acrylic Polyurethane Coating

“…The abrasion resistance of the coatings was determined by falling sand abrasion method according to ASTM D968 standard [28]. The obtained data were the average values from three measurements of each sample.…”

“…Before aging test, as shown in Figure 3, nanoparticles were dispersed evenly inside the coatings, providing a tight structure. Thus, incorporation of nano-SiO2 in polymer matrix should enhance the abrasion resistance of coating [28]. Besides, the light stabilizer, as viscous liquid-plasticizer [3]-might cause the softening effect to the coating.…”

“…These findings are consistent with the data reported by Yari et al [18] for the photo-protective effect of nano-SiO 2 on acrylic melamine coating. Moreover, nano-SiO 2 could also react with isocyanate groups [28] to form a tight organic-inorganic hybrid structure, which contributes to preventing the invasion of external environmental factors [29], leading the coating to reduce its degradation effectively. By the presence of 2 wt % T 384 and 1 wt % T 292, the polymer coating is double-protected by the combination of T 384 (as UV absorber) and T 292 (as free radical cleaner).…”

Fluorinated Linear Copolyimide Physically Crosslinked with Novel Fluorinated Hyperbranched Polyimide Containing Large Space Volumes for Enhanced Mechanical Properties and UV-Shielding Application

“…Moreover, the resulting composites often exhibited phase separation, resulting in significant decreases in comprehensive performance [15][16][17]. As strong synergistic effects, many PI/inorganic nanocomposites with enhanced mechanical properties attracted the attention of researchers and were prepared by intercalation, sol-gel processing, and mechanical blend [18][19][20][21][22][23][24][25][26]. Whereas, due to the poor interfacial compatibility, the added amount of inorganic nanoparticles is very critical.…”

Synthesis and property evaluations of highly filled polyimide composites under thermal cycling conditions from −190 °C to +200 °C

“…One of the most promising is the use of polyimide as a binder for polymer composites for aerospace engineering. Polyimide has the highest thermal stability among polymers and has high physico-mechanical properties [17][18][19][20][21]. Pure polyimide has low radiation protective properties (linear attenuation coefficient of gamma rays μ = 0.13 cm −1 at E = 0.5 MeV), which does not allow its use in outer space.…”