Influence of gamma radiation on compatibilized LLDPE/magnesium hydroxide/sepiolite composites

Abstract

The influence of gamma irradiation on the properties of compatibilized linear low-density polyethylene/magnesium hydroxide (MH)/sepiolite composites has been investigated. Vinyl triethoxy silane and maleated polyethylene have been used as compatibilizers. The compatibilizing effect in the composites is confirmed by the Fourier transform infrared spectra, which showed the presence of additional chemical bonds, which are responsible for the enhanced polymer-filler interaction. As a result, the miscibility of the polar additives into the nonpolar polymer matrix is enhanced. The scanning electron micrographs revealed that the additives are well embedded and uniformly dispersed in the polymer matrix without any voids. The known thermal decomposition temperature of MH ($ 350 C) is also increased in the compatibilized composites. In addition, 150 kGy irradiated composite showed a remarkable improvement of 37 C in the onset degradation temperature of unirradiated composite. Furthermore, the formation of radiation crosslinked structure in the composites also improved the mechanical properties of the composites.

Synthesis of a novel phosphazene derivative and its application in intumescent flame retardant–EVA copolymer composites

“…The absorptions at 1240, 1180, 1103, and 904 cm À 1 indicated the presence of a phosphazene ring in the skeleton of H-12. In addition, the peaks at 1378 and 721 cm À 1 were assigned to the symmetric C-H bending vibrations of the methyl groups and the C-H bending vibrations of the methylene groups [8][9].…”

Influence of radiation-crosslinking on flame retarded polymer materials—How crosslinking disrupts the barrier effect

“…Dripping is prevented when the material is crosslinked and this can be detrimental in some tests (Balabanovich and Schnabel, 2002). Irradiation may modify the fillers (Shafiq and Yasin, 2012;Ahmad et al, 2013) and their dispersion into the matrix (Lu et al, 2005;Ismail et al, 2010;Ahmad et al, 2013;Zaidi et al, 2013) while dispersion is a key parameter controlling the flame retardancy. Crosslinking would prevent the expansion of intumescent systems and therefore their efficiency as flame retardants (Shukri et al, 2008).…”

A novel phytic acid based flame retardant to improve flame retardancy, hydrophobicity and mechanical properties of linear low‐density polyethylene

“…The SEM image at 5000 times of residue from LLDPE/MH presents the flocculent aggregates with loose structure, demonstrating poor isolation of heat and fire, and the main elements are magnesium and oxygen owing to the generation of MgO from the dehydration of MH, while the residue of LLDPE/MGPA displays more stable residue structure with numerous solid particles and abundant elements such as phosphorus, carbon, magnesium, and oxygen well‐distributed in residue, indicating the great effect of dehydration and carbonization from MGPA. [ 35 ]…”