Abstract: In order to improve the properties of poplar impregnated inorganic sodium silicate, the fast-growing poplar was modified by organic-inorganic hybrid method. Using polyvinyl alcohol (PVA) as organic modifier and sodium silicate as inorganic modifier, PVA-sodium silicate hybrid mo-dified poplar wood was prepared by step vacuum pressure in-situ impregnation. The weight percentage gain, density increase ratio, mechanical strength, flame retardant and smoke suppressive performance of unmodified poplar, sodium silicate modified poplar and PVA-sodium silicate hybrid modified poplar were compared. The chemical structure and crystal structure were characterized by Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). The results showed that the weight gain rate of PVA-sodium silicate hybrid modified poplar increased by 7.9% and the density increase rate increased by 12.3%. The hardness, blending strength, compressive strength and impact toughness of poplar modified by PVA-sodium silicate hybrid were all significantly improved. FT-IR analysis showed that PVA reacted with sodium silicate to form interpenetrating cross-linking structure, and form Si-O-C bond and hydrogen bond association with carbonyl and hydroxyl in poplar, which explained the reason for the improvement of mechanical properties of modified poplar. XRD analysis shows that the immersion of PVA and sodium silicate significantly reduces the crystallinity of poplar, which is also the reason for the improvement of impact toughness of modified poplar. The flame resistance of PVA-sodium silicate hybrid modified poplar was similar to that of sodium silicate impregnated modified poplar, but the smoke suppression effect was significantly improved. The average heat release rate of poplar modified by sodium silicate was 57.63 kW/m2, which was 28.93% lower than that of poplar material; the total smoke production of poplar modified by PVA-sodium silicate hybrid was 1.255 m2, which was 40.3% and 31.5% lower than that of poplar material and sodium silicate impregnated poplar, respectively.
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2021, Vol. 35 
