Preparation of aluminum hydroxide/aluminum phosphinate flame‐retardant poly(vinyl alcohol) foam through thermal processing

Abstract

A novel flame-retardant poly (vinyl alcohol) (PVA) composite foam was prepared successfully through thermal processing, which was filled with high content of flame retardant, based on aluminum hydroxide (ATH) and aluminum phosphinate (AlPi) and using water as plasticizer and blowing agent. The flame-retardant property and mechanism of the prepared foam matrix were studied by vertical burning test, limiting oxygen index (LOI), cone calorimeter, scanning electronic microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The experimental results showed that the PVA/ATH/AlPi (1/1.2/0.05) composite achieved LOI value of 41% and UL94 V-0 (3.2 mm) rate. The addition of ATH and AlPi into PVA matrix significantly decreased flammability of the composites, because a more compact and continuous char layer of the PVA/ATH/AlPi composite could be formed, due to the involvement of AlPi in the char-forming reaction. Compared with the pure PVA sample, the peak heat release rate (PHRR) and total heat release (THR) of PVA/ATH/AlPi (1/1.2/0.05) composite were reduced by 76.5% and 58.2%, respectively. Built upon this PVA-based foam matrix with good flame retardancy, the flame-retardant PVA-based foam was successfully prepared through thermal extrusion. In addition, the influence of water content on melt viscosity, foam structure and mechanical strength was also analyzed. V C 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42020.

Smoke suppression and thermal conductivity of epoxy resin modified byAl2O3and hyperbranched flame retardant

“…Based on the above analysis, the flame-retardant mechanism of Al 2 O 3 -PTDOB/EP was speculated as follows: First, the occupancy of Al 2 O 3 in these holey defects of EP promoted the formation of compact char residues, which can act as effective physical barriers to inhibit release of heat and flammable gases during combustion, thereby effectively protecting the internal matrix to prevent further combustion. 20,[30][31][32] Simultaneously, Al 2 O 3 with large specific surface area was able to absorb heavy smoke and toxic gases during combustion to reduce its release, thus improving the fire safety. 33,34 Based on the above analysis for combustion behavior in PTDOB/EP with adding Al 2 O 3 , a possible flame-retardant mechanism was presented in Figure 6.…”

Preparation of continuous glass fiber/polyamide 6 composites containing hexaphenoxycyclotriphosphazene: Mechanical properties, thermal stability, and flame retardancy

“…From the spectra of the GF/PA6/0% HPCTP (Figure 11B-D), the C 1s peak is fitted by three component peaks at 284.8 eV (C C), 286.0 eV (C O) and 287.9 eV (C═O and C═N), respectively. 37 The O 1s spectrum has only one band with binding energies of 532.3 eV, which is corresponding to the O C bond. 35 In N 1s spectra, two fit peaks at 399.0 and 400.6 eV can be attributed the N H and C═N bonds, respectively.…”

Structure and performance of Poly(vinyl alcohol)/wood powder composite prepared by thermal processing and solid state shear milling technology

“…In recent years, our group successfully realized the thermal processing of PVA based on the intermolecular complexation and plasticization, and various PVA products with high performance were prepared, such as PVAbased fiber, film and some other three-dimensional products though melt spinning, thermal blowing extrusion and injection molding [11,16,17]. These previous researches provided the possibility to prepare PVA/wood powder composite by thermal processing.…”