Polymer/clay nanocomposites based on aliphatic–aromatic polyamide containing thiazole ring and new organomodified nanosilicate layers: Synthesis, characterization, and thermal properties study

Abstract

New polyamide/clay nanocomposites (PACN) were produced using semicrystalline polyamide (PA) containing thiazole ring and new organoclay (OC) through solution intercalation technique. For further study, PA/Cloisite‐15A nanocomposites (PAAN) were also prepared using PA and Cloisite‐15A. X‐ray diffraction (XRD), field emission‐scanning electron microscopy (FE‐SEM), and transmission electron microscopy (TEM) results showed a good dispersion for OC in the PA matrix. A meaningful decrease in intensity of absorption from ultraviolet–visible spectra as well as from fluorescence emissions of resulted PACN were observed. As thermogravimetric analysis (TGA) in nitrogen atmospheres showed, the T5 and T10 increased by about 57% and 36%, respectively for PACN containing 5 mass% of OC, as the char yield enhanced greatly, which was about 16.3% higher than the neat PA. Also the TGA results showed that PACN had higher thermal stability than PAAN. Differential scanning calorimetry (DSC) analysis exhibited higher glass‐transition temperature values (Tg) for PACN as compared to the neat PA. POLYM. COMPOS., 39:E1407–E1420, 2018. © 2017 Society of Plastics Engineers

Thermal, water absorption, and mechanical characterizations of polylactide based nanocomposites: Comparison between sodium and modified montmorillonite as reinforcement materials

“…In contrast, the latter reaction is shown in a higher amount of C10A loading (5 and 7 wt%), which results in lower T 10 and T max . This finding indicates the reduced thermal stability that is significantly caused by the agglomeration of clays, as agreed in Jalali et al 38 Correspondingly, poor dispersibility of clay (high contents) in PLA matrix leads to weak interfacial interactions, resulting in faster thermal degradation due to removal of low molecular weight compounds 39 and decomposition of organic modifier in nanoclay. 2 At temperatures above 600 C, pristine PLA produces the least amount of char residue at 1.3%.…”

“…This is due to the presence of clay in tactoids structure (as a result of aggregation or stacking layers), where the attractive intergallery forces between clay platelets reduce the amount of PLA molecular chain diffusion and thus, water molecules can easily penetrate the composite material. 38 Regarding different filler types, PLA/C10A nanocomposites give better resistance improvement of water absorption than PLA/CNa nanocomposites. The role of organic modifier in C10A induces hydrophobicity and promotes better dispersion of clay in nanocomposites.…”

Use of pH-Active Catechol-Bearing Polymeric Nanogels with Glutathione-Responsive Dissociation to Codeliver Bortezomib and Doxorubicin for the Synergistic Therapy of Cancer

“…As shown in Figure S4a, the Si–O stretching vibration adsorption at 1046 cm –1 proved the existence of the functional monomer of DAA­(TBDMS) 2 . The S–S stretching vibration adsorption peak at 526 cm –1 revealed the introduction of a disulfide bond in the polymer backbone .…”

“…The unique chemical shifts at 6.65, 6.60, 6.54, 6.41, 6.09, 5.75, 3.54, 2.68, 0.98, and 0.18 ppm were detected, as shown in Figure S2a, indicating the successful synthesis of DAA­(TBDMS) 2 . The IR spectrum of DAA­(TBDMS) 2 (Figure S2b) revealed the characteristic peaks at 840 cm –1 for the benzene ring in its structure . Moreover, the fragmentation in the MS shown in Figure S2c revealed the presence of the major component with respect to the DAA­(TBDMS) 2 monomer.…”

Synthesis and characterization of novel functional hyperbranched polyamides from AB2 units: effect of extra functional groups

“…Thiazole heterocycles have been shown to be strong fluorescent compounds [30]. Moreover, it has been proved that thiazole rings act as effective nonlinear optical and photochromic materials [31,32]. Therefore, the fluorescence properties of the prepared hyperbranched polymers were studied with the solution of HPs in DMSO.…”