Smoke and toxicity suppression properties of ferrites on flame-retardant polyurethane–polyisocyanurate foams filled with phosphonate

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• 作者：Xiu Liu ; Dong-Mei Xu ; Yi-Liang Wang…
• 刊名：Journal of Thermal Analysis and Calorimetry
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：125
• 期：1
• 页码：245-254
• 全文大小：1,734 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Sciences
  Polymer Sciences
  Physical Chemistry
  Inorganic Chemistry
  Measurement Science and Instrumentation
  
• 出版者：Akad茅miai Kiad贸, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic
• ISSN：1572-8943
• 卷排序：125

文摘

Three types of ferrites zinc ferrite, copper ferrite and nickel ferrite were successfully synthesized via coprecipitation. The morphology of ferrites and foams was studied by X-ray diffraction (XRD), transmission electron microscopy and scanning electron microscopy. The flame retardancy and potential smoke and toxicity suppression effects of ferrites on flame-retardant polyurethane–polyisocyanurate (FPUR–PIR) foams with dimethylmethylphosphonate and tris (2-chloropropyl) phosphate were investigated by thermogravimetric analysis (TG), limiting oxygen index, smoke density rating (SDR), cone calorimeter and X-ray photoelectron spectroscopy. Meanwhile, the detailed reaction between ferrite and phosphonate, ferrite and polyurethane–polyisocyanurate was examined by thermogravimetry coupled with FTIR spectrophotometry, XRD, TG and FTIR. The results showed that ferrites significantly decreased the smoke production of FPUR–PIR, and reduced SDR per unit mass by 25.1–41.6 %. Notably, ZnFe₂O₄ (ZF) showed an excellent performance in smoke and toxicity suppression in this study. Moreover, ZF not only can restrained the release of groups containing phosphorus and kept more P in condensed phase, but also can accelerated the dehydration of PUR–PIR and facilitated the crosslinking of pyrolysis fragments to form thermal oxidation stable char layer. This study has provided insight into possible modes of smoke and toxicity suppression action in FPUR–PIR incorporated ferrites.KeywordsFerritesSmoke suppressionFlame retardantPolyurethane foam