抽提物对二翅豆木材颜色及尺寸稳定性的影响OA

This study focuses on the effects of extractives in Dipteryx odorata wood from South America on the color and dimensional stability of wood,offering a theoretical foundation for the efficient utilization of Dipteryx odorata wood.Em-ploying the CIE 1976 L*a*b* color space system,colorimetric parameters of diverse wood colors of Dipteryx odorata wood were quantitatively analyzed.Fourier transform infrared spectrometer(FTIR)and gas chromatography-mass spectrom-etry(GC-MS)techniques were used to characterize the chemical composition of extractives,analyzing the influence of the composition of extractives on Dipteryx odorata wood color.The existence positions of extractives within wood were ob-served via microstructure observation.Additionally,the impact of extractives on dimensional stability was analyzed by testing wood's wet swelling rate and equilibrium moisture content under various constant humidities.Results demon-strated that the color differences in Dipteryx odorata wood was mainly influenced by the types and content of chromogenic substances in the extractives,especially phenols,flavonoids and analogs,heterocyclic compounds,and terpenes/resin acids,that the higher the content of the extractives,the higher the a* value and the lower the L* value.Ray cells were one of the main locations of extractives in Dipteryx odorata wood,affected radial moisture transport,thus having a signifi-cant impact on the radial dimensional stability of wood.The findings provide technical support for regulating Dipteryx odorata wood color and enhancing its overall properties,and laying a theoretical foundation for the high-value utilization of Dipteryx odorata wood.