Effects of temperature and humidity on the properties and microstructure of glyoxal polymer-reinforced waterlogged Catalpa wood cultural relics
When glyoxal polymer-reinforced Catalpa wood cultural relics are stored in the natural environment or museums,environmental factors such as temperature and humidity can lead to their deterioration.In our study,Fourier transform infrared spectrometry(FTIR)and scanning electron microscopy(SEM)were used to study the properties and microstructure changes of waterlogged Catalpa wood samples reinforced with the glyoxal polymer in environments with different temperature and humidity.The results show that after dehydration and reinforcement of waterlogged Catalpa wood cultural relics,the glyoxal polymer was closely combined with the Catalpa wood cell wall,and part of it was filled in wood cells to strengthen the cell wall.The structure and properties of the samples have no obvious change after being tested at 25℃ and 50％RH for 30 days.After being tested at 60℃ and 50％RH for 30 days,the glyoxal polymer in the samples gradually and evenly adhered to the cell wall and the surface was smooth,and the cross-sectional fracture of the sample was flat.However,the glyoxal polymer on the sample surface gradually disappeared,exposing the wood body.At 25℃ and 95％RH,the hygroscopicity of glyoxal polymer was significantly enhanced,and its binding capacity with water was higher than that of the Catalpa wood cell wall.The binding between glyoxal polymer and cell wall was destroyed,and the reinforcement effect was lost,although it was still filled in the cells.Finally,the mechanisms of the influences of temperature and humidity on the properties and structure of glyoxal polymer-reinforced waterlogged Catalpa wood samples were analyzed,and a structural change model of the glyoxal polymer and Catalpa wood cell wall during moisture absorption and dehydration was proposed.
Waterlogged Catalpa wood cultural relicsGlyoxal polymerTemperatureHumiditySEM
国家科技期刊平台
NSTL
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