Thermal decomposition behaviour of polyamide fire-retardant compositions containing magnesium hydroxide filler

The composition of the reinforcing fibre obtained from the recycling of scrap tyres was analyzed with a view to finding the most suitable applications for it. The material (RF) was separated into two different parts i.e. fibre (F) and microfibre (MF) to ensure the maximum homogeneity of the material under study. Thermogravimetric analysis (TG) together with differential scanning calorimetry (DSC) and infrared spectroscopy (FTIR) were used to identify the polymers present in the waste and to determine in what proportions they were present. Determination of the temperatures of maximum volatile matter evolution (Tmax), the yield at the end of the pyrolysis and the melting temperatures yielded very useful results for the identification of the polymers. In order to confirm the results obtained, pyrolysis of the pure polymers was carried out and the decomposition products were analysed. The results were then compared with the oil composition data derived from the pyrolysis of the waste fibres. Our results showed the presence of two polyamides, rayon, polyester and aramid.

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“…Aramid fibre was also tested but no melting was detected. the melting temperature lies between 259 and 262 °C [16,40,41].…”

Section: Thermal Analysis Of the Reinforcing Fibrementioning

confidence: 99%

Identification of polymers in waste tyre reinforcing fibre by thermal analysis and pyrolysis

Acevedo

Fernández

Barriocanal

2015

Journal of Analytical and Applied Pyrolysis

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“…This is important since hydrated fillers, in particular magnesium hydroxide, may promote polymer degradation, through hydrolysis from water release. For example, this has been observed with polyamide 6 and polyamide 6,6 containing magnesium hydroxide using thermal analysis (thermogravimetric analysis and DSC) combined with evolved gas analysis (mass spectroscopy and Fourier transform infrared spectroscopy (FTIR)) [17]. In these systems, it was found that the decomposition profile of MH/PA-6 overlapped more closely than with MH/ PA-6,6 where the polymer decomposed before the filler (Figure 3).…”

Section: Fire Retardant Mechanisms 299mentioning

confidence: 86%

Fire Retardant Fillers for Polymers

Rothon

2014

Polymer Green Flame Retardants

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“…Magnesium hydroxide (MH), a promising environmental-friendly flame retardant for polymers, has attracted much attention in the recent years due to its acid-free, low cost and good smokesuppressing properties [5][6][7]. However, there are some problems for MH in its actual commercial applications.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, few synergistic systems have been found to be effective. MH functions by endothermic decomposition over 300 • C yielding water and MgO particles acting as a barrier to heat and mass transfer [7], however, due to the lack of the charring components in the molecular structure of MH, it is hard to form a compact and continuous barrier layer which can effectively hold back the diffusion of the flammable gas from the polymer decomposition and the oxygen in air, thus making it difficult to obtain good flame retardancy. Accordingly, consolidating the condensed phase to form a more compact and continuous barrier is advantageous to enhance the flame retardant efficiency of MH.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of novolac‐based char former: Silicon‐containing phenolic resin and its synergistic action with magnesium hydroxide in polyamide‐6

2010

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SUMMARYNovel novolac-based char former silicon-containing phenolic resin (SCPR) was synthesized by the reaction of novolac with -aminopropyltriethoxysilane in ethanol via a dehydration reaction, and the synthesized SCPR was characterized by Fourier transform infrared (FT-IR) spectra, proton nuclear magnetic resonance ( 1 H NMR) spectroscopy, and thermogravimetric analysis (TGA). Serving as a synergist of magnesium hydroxide (MH) for the flame retardancy of polyamide 6 (PA6), it shows that the introduction of silicon in the structure of novolac molecule can greatly increase the charring performance of phenolic resin, and effectively eliminate the melt drips of PA6, thus improving the flame retardancy of the PA6. Compared with conventional novolac, the thermal oxidative stability of SCPR was obviously enhanced in the presence of MH due to the decrease of phenol hydroxide groups sensitive to oxidation, as well as the high energy Si-O bond introduced in the molecular structure.

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Thermal decomposition behaviour of polyamide fire-retardant compositions containing magnesium hydroxide filler

Cited by 143 publications

References 8 publications

Identification of polymers in waste tyre reinforcing fibre by thermal analysis and pyrolysis

Identification of polymers in waste tyre reinforcing fibre by thermal analysis and pyrolysis

Fire Retardant Fillers for Polymers

Synthesis of novolac‐based char former: Silicon‐containing phenolic resin and its synergistic action with magnesium hydroxide in polyamide‐6

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