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

Abstract

Surface of poly(vinyl chloride) (PVC) thin films was coated using DOPO‐based polyamide (DBPA) coating and DBPA/Mg(OH)2 nanocomposites (DBPN) coating by dip‐coating process. For this purpose, a new DOPO‐based dicarboxylic acid (DBDA) was synthesized and used for preparation of DBPA and organically surface modification of Mg(OH)2 nanoparticles. The effects of DBPA and DBPN coatings on the morphology, thermal stability, combustion, and mechanical properties of PVC were investigated. The uniform dispersion of Mg(OH)2 nanoparticles (nano‐MDH) and organically coating manner on the surface of the PVC films were confirmed by ATR‐IR spectroscopy, X‐ray diffraction (XRD), field emission scanning electron microscopy (FE‐SEM), energy dispersive X‐ray, and elemental mapping. From thermal gravimetry analysis (TGA) results, the 10 mass% loss temperature (T10) increased from 268°C to 272°C in PVC coated with DBPA‐containing 10 mass% of modified Mg(OH)2 (MMH). Also the char residue, first and second mass loss temperatures of all PVC coated were increased compared with the neat PVC film. According to microscale combustion calorimetry (MCC) results, the peak of heat release rate (pHHR) and total heat release (THR) were decreased from 128 ± 2 to 69 W/g and 12 ± 1 to 4 ± 2 KJ/g for PVC film coated with DBPA‐containing 10 mass% of MMH, compared with the neat PVC. From tensile test results, tensile strength was increased from 31.78 ± 0.8 to 39.64 ± 0.9 MPa for PVC coated with polyamide‐containing 5 mass% of MMH compared with the neat PVC.

Construction of thermoplastic cellulose esters matrix composites with enhanced flame retardancy and mechanical properties by embedding hydrophobic magnesium hydroxide

“…The tensile and flexural properties of the as‐prepared CEMC in this study were noteworthily enhanced compared with those of previously reported CEMC 9 . In the CEMC with low O‐MH content, O‐MH had a toughening effect and could reduce the brittleness of CEMC, 41 which is the key to enhancing the flexural strength and flexural modulus of CEMC. The O‐MH nano‐sheets bore the stress transfer during the stretching process of CEMC, which delayed the fracture of CEMC.…”

Plasticized polyvinyl chloride/melamine‐cyanurate modified Mg(OH)2@bentonite nanocomposites; mechanical, thermal, and flame retardant properties

“…At first MC and MDH were prepared according to previous literature. 9,41 To modify bentonite by melamine cyanurate, in a 100 mL-flask, 1 g bentonite and 15 mL deionized water were added and stirred for 24 h at 25 C. In this period, the resulting slurry was irradiated with ultrasonic waves several times. After that, in a 100-mL beaker, 1 g MC was added to 10 mL of deionized water, and pH was controlled between 4.5 and 5.5 by an HCl solution.…”

“…7 In other words, the preparation of PVC nanocomposites is an extensively valuable method for improving thermal stability, flame retardancy, and preventing the migration of PVC plasticizers. [8][9][10][11][12][13] Inorganic metal hydroxide fillers like aluminum trihydrate (ATH) and magnesium dihydroxide (MDH) have been known as excellent examples of flame retardant materials. [14][15][16] MDH and ATH have exhibited a high effect in reducing the heat released and cooling the combustion zone, delaying the ignition time, and decreasing the weight loss caused by ignition.…”

Polyamide nanocomposites containing hydrazide–hydrazone group reinforced with functionalized polyethyleneimine modified Mg(OH)2 nanoparticles: Study on thermal properties, combustion resistance, and lead ion adsorption

“…First, MDH was synthesized according to the previous procedure. [27] For the surface modification of MDH, PEI as nitrogen-rich polymer was functionalized with the imine groups through the reaction with salicylaldehyde. Briefly, 5 ml of ethanol was poured in 0.5 g of PEI, and was stirred at 60 C for 30 min.…”

“…These include the use of flame retardant polymers, [25] incorporation of fire resistance groups into the polymer chain, [26] or the preparation of polymer nanocomposites using modified nanoparticles. [27,28] The resulted polymer nanocomposites show all of the properties of both polymers and nanoparticles, such as ductility, flexibility, thermal, and fire stability. [29][30][31][32][33] One of the most helpful reinforcement is the mineral nanoparticles such as metal oxides and metal hydroxide.…”