Abstract
A novel flame-retardant composite material based on zinc alginate (ZnAlg) and nano-cuprous oxide (Cu2O) was prepared through a simple, eco-friendly freeze-drying process and a sol-gel method. The composites were characterized and their combustion and flammability behavior were tested. The composites had high thermal stability and achieved nearly non-flammability with a limiting oxygen index (LOI) of 58. The results show remarkable improvement of flame-retardant properties in the ZnAlg/Cu2O composites, compared to ZnAlg. Furthermore, the pyrolysis behavior was determined by pyrolysis–gas chromatography–mass spectrometry (Py-GC-MS) and the flame-retardant mechanism was proposed based on the combined experimental results. The prepared composites show promising application prospects in building materials and the textile industry.
Highlights
Sodium alginate (NaAlg) is a hydrophilic and biodegradable linear polysaccharide copolymer consisting of two different ratios of spatially different 1,4-linked α-L guluronic acid and β-D mannuronic acid repeating unit composition [1,2,3]
Nano-Cu2 O is a new type of p-type oxide semiconductor material that can be excited by visible light
The morphology and microstructure of the samples were examined by SEM (SIGMA, Zeiss, Oberkochen, Germany)
Summary
Sodium alginate (NaAlg) is a hydrophilic and biodegradable linear polysaccharide copolymer consisting of two different ratios of spatially different 1,4-linked α-L guluronic acid and β-D mannuronic acid repeating unit composition [1,2,3]. Nano-Cu2 O is a new type of p-type oxide semiconductor material that can be excited by visible light It has an active electron-hole pair system and exhibits good catalytic activities [15,16,17]. It shows excellent adsorption properties and low-temperature paramagnetism, and has potential applications in organic synthesis, photoelectric conversion, new energy, photolysis of water, dye bleaching, sterilization, superconductivity and other. The pyrolysis products of the flammability behaviors of the composites were assessed by the limiting oxygen index (LOI), vertical composites, of the char residue, were investigated to reveal the the flame-retardant mechanism of burning rateSEM (CONE). Composites, SEM of the char residue, were investigated to reveal the flame-retardant mechanism of the prepared materials
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