Journal
APPLIED CLAY SCIENCE
Volume 228, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.clay.2022.106646
Keywords
Layered double hydroxide; Guanidine phosphate; Flame-retardant; One-step modification
Funding
- National Natural Science Foundation of China [21968014, 22008097]
- National Key Research and Development Program of China [2019YFC1805904]
- Key Project of Science and Technology Plan of Zhejiang Province [2021C01094]
- Scientific Research Fund of Yunnan Provincial Department of Education [2021J0051]
- Analysis and Testing Foundation of Kunming University of Science and Technology [2019T20170031]
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In this study, Mg/Al-LDH was selected and modified with GP to create a more complete layered structure. The modified LDH showed improved thermal stability, reduced heat release rate and total heat release, and increased limiting oxygen index (LOI), indicating excellent flame retardant performance.
Layered double hydroxides (LDH) was proved as preferable retardants for lignocellulosic materials. In this study, Mg/Al-LDH was selected and one-step modified by GP which exhibited superior characteristics of flame retardancy and non-toxicity. Results showed that more complete two-dimensional layered structure with suitable crystal particle size was formed for GP modified LDH. Specifically, GP(3)-LDH not only enhanced the thermal stability of cellulosic composites, but also assisted the peak heat release rate (PHRR) and total heat release (THR) in declining 42.5% and 22.7% compared with those added with non-modified Mg/Al-LDH. In addition, the limiting oxygen index (LOI) achieved as high as 27.7% with 15 wt% addition, indicating the successful modification with GP for outstanding flame-retardant performance, low addition and controlled strength of cellulosic composites.
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