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Preparation and characterization of intumescent flame retardant biodegradable poly(lactic acid) nanocomposites based on sulfamic acid intercalated layered double hydroxides

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Abstract

A novel sulfamic acid intercalated MgAl-LDH (SA-LDH) was prepared by intercalating NH3SO3− into MgAl-layered double hydroxides (LDH), and it was then introduced into poly(lactic acid) (PLA) resin in association with intumescent flame retardant (IFR) by melt blending to prepare a flame-retardant biodegradable PLA composite. The effects of SA-LDH on the flame retardancy of PLA composites were characterized by limiting oxygen index (LOI), vertical burning test (UL-94) and cone calorimeter test (CONE). The results showed that the composite sample containing 19.0 wt% IFR and 1.0 wt% SA-LDH achieved the maximal LOI value of 48.7 %, passed the UL-94 V-0 rating, and significantly decreased the peak heat release rate from 306.3 kW/m2 of neat PLA to 58.1 kW/m2. Thermogravimetric analysis showed that both the thermal stability and the char formation were enhanced. The char morphology observation revealed that SA-LDH was beneficial to form dense and compact char layers. It was demonstrated that there existed a synergistic effect between IFR and SA-LDH in promoting the char formation and enhancing the fire resistance. The mechanical and crystallization properties were also tested and discussed.

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Authors and Affiliations

  1. Beijing Key Laboratory of Advanced Functional Polymer Composites, Beijing University of Chemical Technology, Beijing, 100029, China

    Yongxin Yan, Xiaoyu Gu, Limin Li, Hongfei Li, Jun Sun & Sheng Zhang

  2. State Key Laboratory of Inorganic-Organic Composites, Beijing University of Chemical Technology, Beijing, 100029, China

    Yongxin Yan, Xiaoyu Gu, Limin Li & Hongfei Li

Authors
  1. Yongxin Yan
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  2. Xiaoyu Gu
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  3. Limin Li
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  4. Hongfei Li
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  5. Jun Sun
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  6. Sheng Zhang
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Correspondence to Jun Sun or Sheng Zhang.

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Yan, Y., Gu, X., Li, L. et al. Preparation and characterization of intumescent flame retardant biodegradable poly(lactic acid) nanocomposites based on sulfamic acid intercalated layered double hydroxides. Fibers Polym 18, 2060–2069 (2017). https://doi.org/10.1007/s12221-017-1153-2

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  • DOI: https://doi.org/10.1007/s12221-017-1153-2

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