Preparation and properties of polyimide-based nanocomposites containing functionalized Fe₃O₄ nanoparticles

Abstract

Polyimide (PI)/Fe3O4 nanocomposites were successfully prepared via the thermal curing of different amounts of Fe3O4 nanoparticles (2, 4, 6 and 8 wt%) functionalized by 3-aminopropyltriethoxy silane as a coupling agent, containing the poly(amic acid) derived from 5-diamino- N-(4-(4,5-diphenyl-1H-imidazol)phenyl)benzamide and 3,3′,4,4′-benzophenonetetracarboxylic dianhydride. The effect of Fe3O4 nanoparticles on the structural, thermal and magnetic properties of nanocomposites was investigated. The Fourier transform infrared spectroscopy and scanning electron microscopy (SEM) results reveal that the surface of Fe3O4 nanoparticles is sufficiently compatible with PI through linkage of the coupling agent between Fe3O4 and the polymer. Also, the SEM image shows that Fe3O4 nanoparticles are dispersed uniformly in the polymer matrix, with a particle size of around 78 nm. The nanocomposites of 2 and 8 wt% exhibit the saturation magnetization values of 0.055 and 0.170 emu g− 1, respectively. The thermogravimetric analysis data show that the thermal stability of the nanocomposites is improved as compared to the pure PI.

Polyimide-Based Nanocomposites with Binary CeO2/Nanocarbon Fillers: Conjointly Enhanced Thermal and Mechanical Properties

“…Aromatic polyimides (PIs) exhibiting extremely high thermal and chemical stability, as well as outstanding mechanical and insulating properties, have found widespread use in numerous applications spanning from microelectronics to aerospace engineering [ 1 , 2 , 3 ]. However, the scope of PIs’ application could be substantially expanded, taking into account the cutting-edge techniques for fabrication of polymer-based nanocomposites doped with various inorganic species, i.e., metal oxides, Fe 3 O 4 [ 4 ], SnO 2 [ 5 ], NiO [ 6 ], TiO 2 [ 7 ], Al 2 O 3 [ 8 ], etc. An important advantage of nanocomposites in comparison with conventional multicomponent materials is that nanoparticles provide an increase in the matrix-filler contact area.…”

Fe3O4@THAM‐Pd as a highly efficient magnetically recoverable nanocatalyst for facile one‐pot assembly of substituted imidazoles under solvent‐free conditions

“…Metal oxide nanostructures are popular for various scientific purposes due to their amazing and special properties. [ 1–3 ] In the midst of it all, magnetic nanoparticles (MNPs) of Fe 3 O 4 have come into prominence for their cost‐effectiveness, facile preparation, high magnetic penetrability, and extensive applications in various issues such as adsorption, catalysis, drug delivery, and optoelectronics. [ 4–8 ] However, their practical application is restricted by instability in acidic and alkaline medium, and readily aggregation, owing to easy oxidation, specific surface area, and high surface free energy.…”

Fe3O4-Based Melamine-Rich Covalent Organic Polymer for Simultaneous Removal of Auramine O and Rhodamine B

“…MO nanostructures are especially of interest because of their promising features. , Among these, iron oxide nanoparticles (Fe 3 O 4 NPs) are of huge emphasis, owing to their easy production, cost-effectiveness, and extraordinary magnetic permeability. , Nevertheless, applications of these NPs are restricted by their easy aggregation due to high surface free energy, specific surface area, and straightforward oxidation, and they also create a pressure drop in the adsorption process . To overcome these difficulties, a variety of modification approaches were attempted by adding different compounds to enhance the dispersibility and stability of Fe 3 O 4 NPs. , So far, diverse materials have been effectively utilized to modify Fe 3 O 4 NPs, including different organic and inorganic modifiers that can be termed as cyclodextrins, silanes, MOFs, , and COFs . To better overcome such demerits, we prepare a covalent organic polymer (COP)-grafted Fe 3 O 4 NP support, in which the COP having a carbon–nitrogen network is an upcoming adsorbent material because of its unique features such as high specific surface area, high pore size, tunability, and easy synthesis …”