Amide-acid functional SiO₂nanocomposites based on new semi-crystalline poly(ether-sulfone-amide): thermal, combustion and mechanical studies

Abstract

New amide–acid functional SiO2 nanoparticle (FSNP)‐reinforced semi‐crystalline aliphatic–aromatic poly(ether‐sulfone‐amide) (PESA) was synthesized using a solution method in dimethylformamide. The surfaces of SiO2 nanoparticles were functionalized with phthalic anhydride, and subsequently PESA was synthesized using direct polymerization with good yield and desired molar mass. PESA/SiO2 nanocomposites (PSNCs) were prepared with three different contents of FSNP and the morphology and mechanical, thermal and combustion properties of the PSNCs were studied. The results of X‐ray diffraction, field‐emission scanning electron microscopy and transmission electron microscopy showed a uniform dispersion for FSNP in the PESA matrix. According to the results of mechanical tests, the tensile strength and the Young's modulus of PESA were enhanced by FSNP loading. Thermogravimetric analysis and derivative thermogravimetry results showed a substantial improvement in thermal properties of PESA. The temperature at 5% mass loss was increased from 371.7 to 395.8 °C for the PSNC containing 8 mass% of FSNP, as well as the char yield being enhanced greatly, which was about 30% higher than that of neat PESA. Significant improvements in combustion properties were observed for PSNCs from microscale combustion calorimetry. The peak heat release rate showed an obvious improvement and decreased by about 57% compared to that of neat PESA on 8 mass% loading of FSNP. © 2016 Society of Chemical Industry

Preparation and characterization of poly(amide‐imide)/Mg‐Al LDH nanocomposites; effect of organo‐modified LDH on thermal properties and morphology

“…For preparation of second organomodified LDH (ALDH), dicarboxylate salt of diacid 8 was used. Diacid 8 was synthesized from bis‐(2‐chloroethyl)ether and 4‐hydroxybenzoic acid according to previous work (Scheme ) .…”

“…) showed absorption bands at 3353 cm −1 (NH, stretching vibration), 1770 and 1711 cm −1 for the imide heterocyclic ring (antisymmetric and symmetric CO stretching vibration), 1388 cm −1 (CN stretching vibration), 1041 and 720 cm −1 (imide ring). Also the absorption band appeared at 1671 cm −1 related to amide carbonyl group in the main chain of PAI .…”

“…For preparation of second organomodified LDH (ALDH), dicarboxylate salt of diacid 8 was used. Diacid 8 was synthesized from bis-(2-chloroethyl)ether and 4hydroxybenzoic acid according to previous work (Scheme 3) [38]. As a possible model, the structure of organic modifier can be arranged vertically and/or horizontally to the basis layers of LDH.…”

New nanocomposites based on polyamide containing imine groups reinforced with functionalized polyethyleneimine‐modified ZnO nanoparticles; fabrication, characterization and lead ion adsorption studies

“…For surface investigation such as porosity, particle shape and appropriate size distribution of nanoparticles in to the polymeric matrices, SEM has been a useful instrument .…”

Influence of imide functionalized organo‐modified Mg‐Al layered double hydroxide on the thermal and mechanical properties of new aliphatic‐aromatic poly (amide‐imide)

“…[33][34][35][36] However, their applications may be limited due to low solubility in organic solvents, high stiffness and high melting temperature. Many efforts have been made to enhance the chain mobility and solubility by incorporating some flexible bonds such as ether linkages, aliphatic chains and sulfone groups, [37,38] bulky side group [1,39] and heterocyclic structure in the polymer backbone. [40] Poly (amideimide) s have been developed as an useful alternative for polyamides and polyimides with the balance of processability with thermal stability along with mechanical properties.…”