A review on polyimide reinforced nanocomposites for mechanical, thermal, and electrical insulation application: challenges and recommendations for future improvement

Thermomechanical Behavior of Bone-Shaped SWCNT/Polyethylene Nanocomposites via Molecular Dynamics

“…In order to comprehensively examine the two-phase NC models, the pure PE amorphous material should be analyzed beforehand for each tested temperature level T = 300, 325, 350, 375, 400 K. It should be mentioned that all simulations are performed for temperatures higher than the glass transition temperature of polyethylene [10]. For all cases, it is assumed that the PE has an initial density equal to in ρ PE = 0.6 g/cm 3 . According to this PE density value, by utilizing 10 PE polymer chains and by taking into account the molecular weight of each PE chain, a cubic unit cell of equal initial side lengths of in L PEx , in L PEy , and in L PEz along the x-, y-, and z-axis is constructed [21].…”

“…In the second stage, the periodic unit cell representing the problem under consideration is constructed using standard packing algorithms available by commercial software packages [21] and by following the procedure that is analytically described in the previous section. After defining the three-dimensional (3d) unit cell box for the tested temperature T, a number of PE chains are inserted into it while the packing algorithm evenly increases their population until the initial unit cell density is achieved, i.e., in ρ PE = 0.6 g/cm 3 or in ρ NC of Equation ( 4) when the pure matrix or the NC is to be analyzed, respectively. Evidently, the relevant positioning of the molecules is performed after computing the interactions between neighbor atoms via the Dreiding force field whereas the single-chain conformations, ring spearing, and close contacts are constantly monitored.…”

“…Nowadays, the research on nanomaterial reinforced composites that are subjected to thermomechanical loads is of great interest since it may provide valuable practical and efficient solutions in a variety of novel applications. Today, intensive research is carried for the production of polymer-based nanocomposites with special and enhanced thermal conductivity properties for use in thermal management systems [ 1 , 2 ] or, on the contrary, for the development of nanofilled polymers for thermal insulation applications from energy storage to power delivery [ 3 ]. Additional attention is paid in the field of structural applications where nanoreinforced polymers seem to be ideal candidates for high-temperature operation devices [ 4 , 5 ].…”

Solubility, thermal and photoluminescence properties of triphenyl imidazole-containing polyimides

“…Aromatic polyimides (PIs), as a kind of high-performance engineering material, have attracted wide attention because of their excellent properties, such as chemical solvent resistance, excellent thermal and mechanical properties, and outstanding dielectric performance, and they have been widely used in the elds of microelectronics, separation membranes, aerospace and other applications. [1][2][3][4] The traditional aromatic polyimides display a brown-yellow color. The reason is mainly that the charge transfer complex (CTC) is easily formed between the electron donor (diamine) and electron acceptor (dianhydride), resulting in the absorption of light.…”

Effects of Solid State Fermentation on some Physicochemical and Nutritional Properties of Post-Harvest Cowpea (Virgna unguiculata (L)Walp) Leavesv

“…Fermentation, a veritable biochemical option (Jones, 1993), has been reported to effect a number of useful changes on biosubstrates. These range from improved nutritive values (Wakshama and Akueshi, 2009), enhanced flavor (Wakshama and Akueshi, 2008), impacted colour, taste and aroma (Ishiwu et al, 2015), improved protein, amino acid and lipids (Wakshama and Akueshi, 2009), influenced crude fibre content (Ogbonna and Popoola, 1997;Olatunde and Ekerigin, 2007;Verduzco-Oliva, and Gutierrez-Uribe, 2020), as well as enhancement of bio-colours and pigmentation during solid state fermentation (Mhalaskar et al, 2017). According to Ray and Swain (2011), two types of anaerobic digestion are identified, depending on whether hydration is involved or not.…”