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

Abstract

A new dicarboxylic acid modified Mg‐Al LDH (DLDH) containing imide groups was prepared and its effects on the thermal and mechanical properties of the new synthesized aliphatic‐aromatic poly (amide‐imide) (PAI) were investigated via preparation of PAI/nanocomposite films by solution casting method. The results of X‐ray diffraction (XRD), field emission‐scanning electron microscopy (FE‐SEM) and transmission electron microscopy (TEM) showed a uniform dispersion for LDH layers into the PAI matrix. For comparison, the effects of polyacrylic acid‐co‐poly‐2‐acrylamido‐ 2‐methylpropanesulfonic acid (PAMPS‐co‐PAA) modified Mg‐Al LDH (ALDH) on the PAI properties were also studied. The thermogravimetric analysis (TGA) results exhibited that the temperature at 5 mass% loss (T5) increased from 277 °C to 310 °C for nanocomposite containing 2 mass% of DLDH, while T5 for nanocomposite containing 2 mass% of ALDH increased to 320 °C, along with the more enhancement of char residue compared to the neat PAI. According to the tensile test results, with 5 mass% DLDH loading in the PAI matrix, the tensile strength increased from 51.6 to 70.8 MPa along with an increase in Young's modulus. Also the Young's modulus of PAI nanocomposite containing 5 mass% ALDH reduced from 1.95 to 0.81 GPa.

Fabrication and study of thermal and combustion resistance of DOPO‐functionalized polyamide reinforced with organo‐modified Mg(OH)2 nanoparticles

“…Another method to improve heat and combustion stability of polymers is to use as small as possible content of inorganic nanoparticles for the preparation of polymer nanocomposites 30,31 . Polymer nanocomposites are known for their significant properties such as high tensile strength, 32 heat resistance and low flammability, 30,33 optical properties, 34 high homogeneity and flexible processability, 35 as compared to the corresponding neat polymers.…”

Superelastic and Fire-Retardant Nano-/Microfibrous Sponges for High-Efficiency Warmth Retention

“…The robust flame retardant property could be attributed to the good char-forming ability of the benzene ring and imide functional group derived from PAI; and the formed compact char layer would effectively improve flame resistance by prohibiting the heat flux and air incursion (Figure S7). 42…”

“…Comparing with control fibrous sponges, the PPSU/PU/PAI-2 nano-/microfibrous sponges showed higher pyrolysis temperatures in the most important decomposition stage (300–600 °C). In addition, the PPSU/PU/PAI-2 fibrous sponges possessed a higher residue percentage (5.99%) at 800 °C, indicating that the PAI nanofibers could effectively enhance the thermal stability of the nano-/microfibrous sponges. − …”

Phosphorus‐containing polyamide Mg(OH)2 nanocomposite coating on surface of poly(vinyl chloride) thin film: Study on thermal stability, flammability, and mechanical properties

“…Another method to improve the heat stability and flame retardancy of polymers has been use of low content of inorganic nanoparticles into the polymeric matrix 15 . Among the additive boosters, it is possible to mention nanoparticles such as clay, layered double hydroxides, 16 and magnesium hydroxide 17 .…”