NANOPARTICLES DISPERSION IN PROCESSING NANOSTRUCTURE CHIRAL POLY(AMIDE-IMIDE)S BASED ON 7V-TRIMELLITYLIMIDO-Z,-LEUCINE/TiO2 NANOCOMPOSITES: ALLOCATION AND PROPERTIES

Abstract

Poly(amide-imide)s (PAI)s as engineering materials have received more attention owing to their high thermal and chemical stability. Therefore, organic/ inorganic nanocomposite (NC) of these materials has been widely studied in the last few decades. Here, we present PAI-NCs preparation containing surface modified TiO 2 nanoparticles (NP)s by employing silane coupling agent under ultrasonic process. Optically active nanostructure PAI was prepared from 5-(2-benzimidazole)-1,3-phenylenediamine (4) and chiral diacid monomer N-trimellitylimido-L-leucine (5) using molten salt tetrabuthylammonium bromide as an activating medium. A considerable improvement of properties can be achieved by inserting NPs into the polymer matrix. The results of field emission scanning electron microscopy and transmission electron microscopy indicated that there is a little aggregation of a large quantity of particles. Thermogravimetric analysis confirmed that the heat stability of the polymer NCs in the temperature range of 400-800 ºC was enhanced.

Synthesis and characterization of TiO2 thin films for DSSC prototype

“…There are some other peaks found in the FTIR of all the samples at 1550 cm -1 and 1420 cm -1 which is due to the contamination from the atmospheric contribution. [46].…”

“…This peak for hydroxyl group is also present in all the samples. For the samples, T50, T1, T5 and TD20, there is a peak nearly at 2900 cm −1 regarding C-H stretching band, which means all organic compounds were not removed from the samples even after calcinations [44,45]. There are some other peaks found in the FTIR of all the samples at 1550 cm -1 and 1420 cm -1 which is due to the contamination from the atmospheric contribution.…”

“…It is observed that as the amount of surfactant is increasing, the crystalline size decreases. The XRD peaks for the TiO 2 nanoparticles synthesize are observed at different scattering angles 25.36°, 37.03 76.20°and are assigned to (1 0 1), (1 1 0), (0 0 4), (2 0 0 planes respectively [45]. These 2θ values could be well structure (JCPDS no.21-1272) [49].…”

Influence of polyamide–imide concentration on the cellular structure and thermo-mechanical properties of polyetherimide/polyamide–imide blend foams

“…8, the different thermal decomposition rates of foams in the first-step corresponding to the decomposition of the aliphatic part leads to a common weight loss value of around 25% at 550°C for all foams. From this temperature on slight differences in the second-step decomposition rate corresponding to the aromatic part result in different char residues at 1000°C (CR), as summarized in Table 2, together with the limiting oxygen index (LOI) determined based on Van Krevelen and Hoftyzer equation (LOI = 17.5 + 0.4 CR [36,37]. Again, 75/25 blend foam leads to the highest value among foams, as its finest foam structure seemed to provide a more efficient thermal barrier effect after the second stage of thermal decomposition, delaying the decomposition of the carbonaceous residue from about 750°C (see Fig.…”

The thermal, optical, flame retardant, and morphological consequence of embedding diacid‐capped ZnO into the recycled PET matrix

“…These practical difficulties have to be overcome before NPs can be applied as modifier in NC manufacturing. 20 Binding of organic coupling agents onto the surface of NPs, acts as a bridge between NPs and organic matrix. Currently, various coupling agents such as H550, 21 citric acid, 22 and stearic acid 23 have been examined on the surface of ZnO NPs and compared to the NC filled with unmodified ZnO 23 ; results showed significant improvement in the NCs properties.…”