No smoke and size shrinkage could be observed during the combustion of CA/MgO-P or CA/MgO nanofibers. The flame of CA/MgO-P and CA/MgO could be self-extinguished once the ignition source was removed. Doped CA nanofibers showed best flame-retardancy by extending the heat-induced broken time from 0.46 to 12.09 s, which is 26.3 times that of CA nanofiber. Three evaluation methods including broken time after heating, thermography during heating, and combustion observation were adopted to compare the flame-retardancy of composited nanofibers. TGA was used to analyze the detailed decomposition procedures of bare, MgO-P, and MgO doped CA nanofiber.
SEM, XRD, FTIR, HRTEM were used to characterize all related products. The disassociated nano flaky petal of around 50 nm (~ 20 nm in thickness) of MgO-P and MgO by sonication were used as flame-retardants for the electrospun cellulose acetate (CA)/MgO-P or CA/MgO nanofiber. Flower-shaped hydromagnesite (MgO-P) and magnesium oxide (MgO) micro spheres were synthesized via precipitation-aging method with and without calcination.
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