Study on morphology characteristics during thermal decomposition of Xuan paper by visual thermogravimetric analysis
In this study,the morphology characteristics of Xuan paper during high purity nitrogen and air thermal decomposition were investigated.The image sequences of samples heated from room temperature to 800℃were collected in situ by high-definition camera system.Then,combined with infrared spectroscopy,the corresponding structural state of paper at different temperatures was detected to analyze the relevant pyrolysis process.The results revealed that during nitrogen thermal decomposition,the color of Xuan paper gradually darkened,and its diameter decreased with increasing temperature,which was attributed to the gradual degradation and carbonization of rice paper fibers.In air thermal decomposition,the color of Xuan paper first darkened and then turned white,resulting from the oxidation and decomposition of carbonized substances in the air.The brightness change rate(ΔL)and shrinkage rate(Δd)could quantify the degree of morphological changes in Xuan paper during thermal decomposition.Specifically,its brightness gradually decreased after 150℃,ultimately declining by 62.2%and 25.0%in diameter in nitrogen thermal decomposition.In air thermal decomposition,the brightness of paper dropped by 63.2%before starting to rebound,ultimately exceeding its initial brightness,while its size shrunk by 50%.The color changes in rice paper were closely related to the degree of thermal decomposition of its internal fibers.Regression analysis between ΔL and pyrolysis conversion rate(α)revealed an exponential quantitative relationship between the two.Based on the obtained exponential model,the α value could be calculated using ΔL,further enabling non-destructive assessment of the degradation of internal fiber components in aged Xuan paper.
Xuan paperthermal decompositionmorphology visualizationquantitative analysisaging evaluation
NETL
NSTL
万方数据
