Thermal stability and flammability characteristics of ethylene vinyl acetate (EVA) composites blended with a phenyl phosphonate-intercalated layered double hydroxide (LDH), melamine polyphosphate and/or boric acid

Abstract

a b s t r a c tA phenyl phosphonate-intercalated MgAl-LDH (MgAl-PPh), melamine polyphosphate (MP), and boric acid (BA) were independently and concomitantly added to neat ethylene vinyl acetate (EVA) copolymer at loading fractions of 10% (w/w). The structural morphology of MgAl-PPh was established via powder Xray diffraction (PXRD) and scanning electron microscopy (SEM) while the presence of phenyl phosphonate in the galleries was confirmed by Fourier transform infrared (FTIR). Thermogravimetric analysis (TGA) and cone calorimetry were used to evaluate the thermal stability and flammability behavior of EVA and its composites. While time-to-ignition is greatly reduced for EVA composites compared to the virgin polymer, there are remarkable reductions in the peak heat release rate (PHRR) which relates to a reduction in flame intensity. Synergistic effects were observed in cone calorimetry for the formulation containing MgAl-PPh, MP, and BA.

Flame retardancy and thermal and mechanical performance of intercalated, layered double hydroxide composites of polyamide 11, aluminum phosphinate, and sulfamic acid

“…28 For the relatively low portion of these groups, the influence of additives was not considerable. However, the bigger peak emerging from 30 to 80 8C was relevant to the glass transition, corresponding to the long-range macromolecular mobility.…”

Polymer Nanocomposites: A nearly Universal FR Synergist

“…It is also possible to control the aspect ratio and the uniformity of the layered materials with the control of synthetic conditions. Wilkie at Marquette University was the fi rst researcher to report the use of LHD as fl ame retardant in a variety of plastic resins [11].…”

Dual Fire Retardant Action: The Combined Gas and Condensed Phase Effects of Azo-Modified NiZnAl Layered Double Hydroxide on Intumescent Polypropylene

“…The value of x usually lies in the range of 0.33 > x > 0.22 17 . Recent research indicates that LDH, as a synergistic fire retardant agent in polymer/IFR systems, can not only catalyze the formation of carbonaceous residue during thermal decomposition, but also enhance the thermal stability of polymer composites and make the resulting char layer more stable and compact [18][19][20] . Zhang et al 21 systematically investigated the influence of sodium dodecyl sulfate (SDS) intercalated ZnAl, MgAl, CaAl, and CuAl-LDHs on intumescent fire retardant (IFR) PP/LDH nanocomposites.…”