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Abstract
Magnesium oxide (MgO) microcapsules were synthesized via in-situ emulsion polymerization
as confirmed by Fourier transform infrared spectroscopy and scanning electron microscopy.
Pure MgO and the MgO microcapsules were separately incorporated into cellulose fibers
by blend wet spinning. Inductively coupled plasma-emission spectroscopy results revealed
that cellulose fibers modified with the MgO microcapsules contained more Mg2+ than
those modified by pure MgO, indicating more acid resistance. The flammability and
thermal degradation of modified cellulose fibers (cellulose-Mg fibers) were studied
by calorimeter (CONE), thermogravimetry (TGA), and the determination of the limiting
oxygen index (LOI). The minimal LOI value obtained for the cellulose-Mg fibers was
35, being much higher than that of the unmodified cellulose fiber (19). The heat release
rate of the cellulose-Mg fibers was significantly lower than that of the non-doped
ones. The TGA curves showed that the generated residues increased from 13.79% (cellulose
fiber) to 30.26% (cellulose-Mg fiber).