Synthesis of Organo Cobalt−Aluminum Layered Double Hydroxide via a Novel Single-Step Self-Assembling Method and Its Use as Flame Retardant Nanofiller in PP

Abstract

Synthesis of polypropylene/organo-layered double hydroxide (PP/OLDH) has been carried out based on self-assembled organocobalt-aluminum LDH (O-CoAl-LDH). The novel method of synthesizing self-assembled CoAl-LDH and its characterization have also been reported in details. This method is proven to be very efficient way of producing OLDH in a single step with homogeneous composition and structure. As flame-retardant nanofiller, O-CoAl-LDH shows significant decrease in heat release rate (HRR), the total heat release (THR) and the heat release capacity (HRC) of the PP composites, though the thermal stability of the compounds decreases slightly compared to the base polymer. Morphological analyses show that the LDH particles are dispersed in PP matrix in a partially exfoliated form. The activation energy calculation based on the Kissinger method reveals that O-CoAl-LDH has a positive effect on the activation energy of thermal decomposition of PP. However, in the presence of this filler, decomposition of the composites starts at an earlier stage than that of pure PP.

Ethylene Glycol Intercalated Cobalt/Nickel Layered Double Hydroxide Nanosheet Assemblies with Ultrahigh Specific Capacitance: Structural Design and Green Synthesis for Advanced Electrochemical Storage

“…In all the spectra, an intense and broad adsorption band at 3359-3436 cm -1 corresponds to the stretching vibration of hydrogen bonded hydroxyl groups (ν O-H ) from all the samples. [28][29][30][31][32][33][34] The O-H bending vibration of the interlayer water is also observed at 1620-1650 cm -1 and 1589-1596 cm -1 for the product A-Co-Ni H prepared at starting ratio of 1:1 and all the EG-Co-Ni LDHs, respectively. After all, part of water can still intercalate into the layer of the samples due to the mixtured reaction system of EG and water.…”

Preparation and investigation of the combustion behavior of polypropylene/organomodified MgAl-LDH micro-nanocomposite

“…The reason could be that LDH has a role for catalytic degradation of PP. This means LDH does not improve the thermal stability of the matrix; it rather changes the decomposition mechanism of PP [12].…”

Thermal Stability, Combustion Behavior, and Mechanical Property in a Flame-Retardant Polypropylene System

“…Therefore, LDH has attracted considerable attention as a flame retardant and thermal stabilizer [30][31][32][33][34][35][36][37][38]. In particular, Wang et al confirmed that MgAl LDH and CoAl LDH can efficiently improve the flame retardancy of PP [39,40]. In addition, the Ni-based LDH' catalysts are highly active and cost-effective in the partial oxidation and steam reforming of methane to produce H 2 [41,42].…”