High-Performance Nanoadhesive Bonding of Space-Durable Polymer and Its Performance Under Space Environments

Abstract

The present investigation highlights fabrication of polybenzimidazole by high-performance nanoadhesive and its performance under space environments. High-performance nanoadhesive is prepared by dispersing silicate nanopowder into ultra-high-temperature-resistant epoxy adhesive. The surface of polybenzimidazole is ultrasonically cleaned by acetone and then modified by low-pressure plasma before bonding. Electron spectroscopy for chemical analysis reveals that the polymer surface becomes hydrophilic, resulting in an increase in surface energy. Thermogravimetric analysis studies show that the cohesive properties of nanoadhesive are more stable when heated up to 350 C. The adhesive joint strength of surface-modified polybenzimidazole increases considerably, and there is a further significant increase in joint strength when it is prepared by nanosilicate epoxy adhesive. When the nanoadhesive joint of polybenzimidazole is exposed to the safe-low-power critical-experiment nuclear reactor, there is a considerable increase in joint strength up to a dose of 444 kGy and then a decrease. When the joints are exposed to cryogenic ( 196 C) and elevated temperatures (300 C) for 100 h and thermal-fatigue conditions, the joint could retain 95% of the joint strength. The failure mode of the surface-modified polymer is cohesive within the adhesive.

Fatigue in Adhesively Bonded Joints: A Review

“…From experiments, it was concluded that quartz nanoparticles not only increased the sensitivity of damage monitoring, but also enhanced the static and fatigue joint strengths. Bhowmik et al [223] investigated the fabrication of polybenzimidazole by high-performance nanoadhesive and studied its performance under space environments. From thermogravimetric analysis, it was shown that the cohesive properties of nanoadhesive were more stable when heated up to 350 • C. They found an increase in the adhesive joint strength of surface modified polybenzimidazole and a further significant increase in joint strength when it is prepared by nanosilicate epoxy adhesive.…”

Molecular Layer Deposition of Thermally Stable Polybenzimidazole‐Like Thin Films and Nanostructures

“…[1][2][3][4][5][6][7][8][9] They have been found useful in applications ranging from flame-resistant fabrics to aerospace materials and fuel cell membranes. [10][11][12][13][14][15][16] Fully aromatic poly[2,2-(m-phenylene)-5,5-bibenzimidazole] or meta-PBI (m-PBI) (Scheme 1) is the most common commercially available PBI polymer. In addition to m-PBI, different types of PBIs are prepared by using various Molecular layer deposition (MLD) [27][28][29][30][31][32][33][34][35] is a vapor phase thin film deposition method with similar characteristics as atomic layer deposition (ALD).…”

“…[ 1–9 ] They have been found useful in applications ranging from flame‐resistant fabrics to aerospace materials and fuel cell membranes. [ 10–16 ] Fully aromatic poly[2,2‐( m ‐phenylene)‐5,5‐bibenzimidazole] or meta‐PBI (m‐PBI) ( Scheme ) is the most common commercially available PBI polymer. In addition to m ‐PBI, different types of PBIs are prepared by using various aliphatic or aromatic derivatives as monomers for optimizing application specific properties for bioactive materials and fuel cell membranes, for example.…”