ZHANG Ming-long;LIANG Chun-fei;CUI Tong-ke;Anhui Hongsen High-tech forestry Co.,Ltd.;Central South University of Forestry & Technology;Guangxi University Xingjian College of Science and Liberal Arts;

Catalpa bungei C.A.Mcy;;Populus nigra L.;;Dyestuff;;Differences of permeability;;Infrared spectrum

It is of great theoretical and practical significance to study the mechanism of dye penetration difference in wood from the perspective of molecular groups. In this paper, FTIR was used to analysis of Catalpa bungei C.A.Mcy wood and Populus nigra L. wood. The results show that a large number of hydrocarbon group, hydroxyl group(association state), acetyl group(ether group) and carboxyl groups are present in Catalpa bungei C.A.Mcy wood and Populus nigra L..The polar group content of O-H, N=O, C-CL, C=O, C-O, N-H and others is greater than that of Catalpa bungei C.A.Mcy wood, and according to the similar phase dissolution principle, the hydrophilicity of Populus nigra L. is greater than that of Catalpa bungei C.A.Mcy wood. Catalpa bungei C.A.Mcy and Populus nigra L. were placed in acid, neutral and alkaline dye fluids for univariate staining penetration assays.The test results showed that the average longitudinal penetration height of acid, neutral dye and alkaline dyes in Catalpa bungei C.A.Mcy wood and Populus nigra L. was 20.7, 8.9, 15.1 mm and 21, 10.4, 18.2 mm,respectively, and the average longitudinal penetration height of the three different structural dyes in Populus nigra L. was greater than Catalpa bungei C.A.Mcy wood, confirming that the hydrophilicity of Populus nigra L.was greater than that.The type and state of molecular groups in wood significantly affect the depth and uniformity of dye penetration in wood. The more wood polar groups, the better the hydrophilic, the better the permeability.