Layered double hydroxide-oxidized carbon nanotube hybrids as highly efficient flame retardant nanofillers for polypropylene

Abstract

Aqueous miscible organic layered double hydroxides (AMO-LDHs) can act as organophilic inorganic flame retardant nanofillers for unmodified non-polar polymers. In this contribution, AMO [Mg3Al(OH)8](CO3)0.5·yH2O LDH–oxidized carbon nanotube (AMO-LDH–OCNT) hybrids are shown to perform better than the equivalent pure AMO-LDH. A synergistic effect between the AMO-LDH and OCNT was observed; this endows the hybrid material with enhanced flame retardancy, thermal stability, and mechanical properties. The thermal stability of polypropylene (PP) was significantly enhanced by adding AMO-LDH–OCNT hybrids. For PP mixed with AMO-LDH–OCNT hybrids to produce a composite with 10 wt% LDH and 2 wt% OCNT, the 50% weight loss temperature was increased by 43 °C. Further, a system with 10 wt% of AMO-LDH and 1 wt% OCNT showed a peak heat release rate (PHRR) reduction of 40%, greater than the PHRR reduction with PP/20 wt% AMO-LDH (31%). The degree of dispersion (mixability) between AMO-LDH and OCNT has a significant effect on the flame retardant performance of the hybrids. In addition, the incorporation of AMO-LDH–OCNT hybrids led to better mechanical properties, such as higher tensile strength (27.5 MPa) and elongation at break (17.9%), than those composites containing only AMO-LDH (25.6 MPa and 7.5%, respectively).

Integrated Nanostructural Electrodes Based on Layered Double Hydroxides

“…In spite of considerable researches related to pristine LDH‐INEs have been made and showed a trend of rapid growth, inferior electrical conductivity and limited active sites resulted restricted electrocatalytic performance still hinder the widely application of pristine LDH‐INEs . To further improve the electrochemical performance of pristine LDH‐INEs and expand the application areas, the fabrication of more sophisticated materials both in dimension, composition, and structure is badly needed.…”

Electrospun organic–inorganic nanohybrids as sustained release drug delivery systems

“…36,37 This simple technique uses organic solvents to wash LDH particles immediately after synthesis and can tune the surface of LDHs to be hydrophobic, enabling them to be effectively dispersed in apolar environments. [38][39][40] AMOST modified LDHs have also been found to disperse better in hydrophobic polymers than unmodified LDH particles.…”

“…Ibuprofen intercalated MgAl-LDH was synthesized using a hydrothermal method. 40,41 A metal precursor solution containing 2.032 g MgCl 2 Á6H 2 O and 1.207 g AlCl 3 Á9H 2 O (Mg : Al = 2 : 1) in 20 mL deionized water was added drop-wise into a second solution comprising 2.1 g of sodium ibuprofen dissolved in 20 mL of H 2 O. The pH was kept constant at ca.…”

The effect of OCoAl‐LDH and OCoFe‐LDH on the combustion behaviors of polyvinyl chloride

“…However, it is found that most of the relevant literature investigated the gas release of PVC based on the cone results or thermogravimetric analysis (TGA)–Fourier transform infrared (FTIR). Generally, the layered catalyst increases the specific surface area and the contact area with the material, which can enhance the catalytic effect, and a catalyst with a layered structure has a better catalytic effect than a catalyst with the particulate structure.…”