Dimensional Stability and Its Mechanism of Plantation Masson Pine Improved by Sol-gel Method
Masson pine is one of the important crucial artificial forest resources in Guangxi region.But the utilization of it was significantly limited in wood industry due to its poor dimensional stability.Herein,a silica-based sol-gel method was employed to improve masson pine.The effect of impregnation time on the dimensional stability of masson pine was discussed.The improvement mechanism of the sol-gel method on masson pine was elucidated through scanning electron microscopy(SEM),energy-dispersive X-ray spectroscopy(EDS),Fourier-transform infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS),and X-ray diffraction(XRD).The results demonstrated that the size stability of the modified masson pine after 6 hours of sol-gel impregnation treatment was the best.Compared with untreated masson pine,the modified wood showed a 5%impregnation rate.The 60 h water absorption mass increase rate reduced from 34.7%to 28.2%.The 60 h hygroscopic volume expansionratedecreasedfrom16.5%to11.1%.And the72 h anti-aging performance decreased from18.02 color difference value to 11.9.Therefore,the improvement mechanism of the sol-gel method on the dimensional stability of masson pine reflected in two main aspects.Firstly,the entry of moisture could be blocked by the formed glassy layer and expansion structure.Secondly,it bound to the cell walls in the form of hydrogen and chemical bonds to exert permanent swelling effect.
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