The Influece Of Low Temperature Plasma Treatment On The Dyeing Properties Of Poplar Veneer

This paper is based on the study of the change of the physical-chemical characte-ristic of the dyed veneer (including acid dyes and rereactive dyes). According to themechanism of high polymer modified with temperature plasma, surface morphology andchemical composition before and after plasma treatment are studied, analyzing the m-echanism of veneer modified with plasma, providing theoretical basis to modify woodsurface with plasma. The purpose is to enhance utilization of wood and increase influ-ence of plasma.Firstly the wettability and dyeing property of veneer is researched. After plasma t-reatment, the up-take rate, colour difference and uniformity of veneer is improving.Ho-wever, in terms of color fastness, although washing fastness is improved, color fastnessto sunlight reduces because the plasma treatment improves the permeability of the dy-e while reducing its fixing performance.Secondly the single factor analysis is used to study the influence of the kind of gas, processing power and processing time of plasma treatment on the up-take and col-our difference of veneer. The the process optimization is obtained by RSM. When usi-ng acid dyes, with the gas type of air, processing power of85.1W, processing time of24.15s, the uptake is93.58%; with the gas type of air, processing power of50.57W, processing time of20.55s, the veneer colour difference is72.43NBS. When usi-ng reeactive dyes, with the gas type of oxygen, processing power of50W, processin-g time of25s, the uptake is85.15%; with the gas type of oxygen, processing pow-er of109.97W, processing time of15s, the veneer color difference is77.46NBS.Thirdly SEM, EDS, ATR, ESR and XPS analysis techniques to study the surfacemorphology and chemical composition of the plasma treatment stained poplar veneer a-re used. After plasma treatment, the surface of veneer is etching, and surfactants are also enhancing, so that it benefits the penetration and adhesion of dyes on wood surfac-e.Finally, the analysis of the change of uptake, balanced uptake, diffusion coefficentand diffusion activation energy used by the thermodynamics and kinetics of dyeing isresrearched before and after plasma treatment. It indicates that the uptake and dyeingrate of veneer after the plasma treatment are generally improving. As the diffusion c-oefficient increases, the diffusion activation energy decreases, which is more conduciveto the diffusion of the dye.