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Abstract
With Cu2+ complexes as precursors, nano-cuprous oxide was prepared on a sodium alginate template excluded of Cl− and based on which the calcium alginate/nano-cuprous oxide hybrid materials were prepared by a Ca2+ crosslinking and freeze-drying process. The thermal degradation and combustion behavior of the materials were studied by related characterization techniques using pure calcium alginate as a comparison. The results show that the weight loss rate, heat release rate, peak heat release rate, total heat release rate and specific extinction area of the hybrid materials were remarkably lower than pure calcium alginate, and the flame-retardant performance was significantly improved. The experimental data indicates that nano-cuprous oxide formed a dense protective layer of copper oxide, calcium carbonate and carbon by lowering the initial degradation temperature of the polysaccharide chain during thermal degradation and catalytically dehydrating to char in the combustion process, and thereby can isolate combustible gases, increase carbon residual rates, and notably reduce heat release and smoke evacuation.
Highlights
Nano-cuprous oxide is a typical p-type semiconductor material with active electron holes, which exhibits effective catalytic activity, strong adsorption and low-temperature paramagnetic properties [1]
Nano-cuprous oxide was prepared by employing Cu2+ complexes as precursors via a non-chloride in situ method rather than the widely used direct crosslinking of the sodium alginate solution template
The composites based on the calcium alginate/cuprous oxide nanoparticles were fabricated by a simple green crosslinking and freeze-drying process
Summary
Nano-cuprous oxide is a typical p-type semiconductor material with active electron holes, which exhibits effective catalytic activity, strong adsorption and low-temperature paramagnetic properties [1]. It has potential applications in organic synthesis, photoelectric conversion, new energy, water decomposition, sterilization, superconductivity, and others, and has become one of the most widely studied inorganic nanomaterials in the past decade [2,3,4,5,6,7,8,9,10]. Binary-block copolymer with special structures and properties [11,12]. Sodium alginate can form a strong and stable “egg box” model (Figure 1) [12,18,19] structure of water-insoluble materials by crosslinking with divalent or trivalent metal ions, which is widely used in food and medicine [20,21,22], and as an eco-friendly flame-retardant material [23,24,25,26,27]
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