| The objects of the research were to treat poplar wood fiber with sol-gel method and introduce the Silica sol into the nanometer space in the wood fiber cell, and manufacture the woodfiber/nano-SiO2 composite with the good fire resistance performance.The modification mechanism of wood fiber treated, the impact of hot-pressing process on physical and mechanical properties of poplar woodfiber/nano-SiO2 composite, and the fire resistance performance and mechanism of composite were studied.The results of the research are showed as follow:1. The S1O2 particles could enter the wood fiber cell through the pits, and SiO2 sol had some chemical reaction with the-OH of wood cell wall; To keep the good bonding characteristic, the process of washing could help remove the Silica sol on the surface of fiber.2. With one-factor experiment method, the optimum parameters were as follow: Glue consumption:10%; Hot-pressing temperature:170℃; Hot-pressing time:30s/mm. The contact angles testing results showed the process of washing could keep the good bonding characteristic of poplar fiber treated by Silica sol. The analysis of DSC showed that the process of treating by Silica sol had no remarkable impact on the bonding between UF and poplar fiber.3. The fire resistance performance of poplar woodfiber/nano-SiO2 composite was better than that of poplar wood fiber composite. The reason may be that SiO2gel particles within the wood fibers could alleviate the heat transfer and improve the performance of fire resistance.
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