开发了一种新型循环浸泡法(cyclic immersion method,CIM)以提高保护材料在饱水木材中的渗透效率,该方法通过对木材进行安全部分失水后,将其浸入保护材料中,并重复这一过程以增强材料渗透效果.实验选用3种常用保护材料:聚乙二醇(polyethylene glycol,PEG)、天然生物基材料颗粒状纤维素纳米晶(cellulose nanocrystal,CNC)和水溶性壳寡糖(chitooligosaccharide,COS).通过比较保护前后木材样品的外观形貌、增重率、体积收缩率、色差表征,并结合X 射线衍射(X-ray diffraction,XRD)、傅里叶变换红外光谱(Fourier transform infrared spectroscopy,FTIR)和热重分析(derivative thermogravimetry,DTG)等手段,对CIM的有效性进行评估.结果表明,CIM 能显著提升保护材料在饱水木材中的渗透效果,其中PEG 尤为突出,增重率达102%,是传统浸泡法的2 倍以上,且木材收缩率极小,色差在可接受范围内.CIM 可提升保护材料在饱水木材中的渗透量,促进保护材料与饱水木材之间的相互作用,为保护材料在饱水木材中的高效渗透提供了一种有效方法.
A new cyclic immersion method (CIM) is developed to enhance the penetration efficiency of conservation materials into waterlogged wood. CIM involves the controlled dehydration of wood followed by immersion into a conservation material, with the cycle repeated to enhance penetration. Three conservation materials, commonly used polyethylene glycol (PEG), natural particulate cellulose nanocrystal (CNC) and water-soluble chitooligosaccharide (COS), are tested. CIM's effectiveness is assessed through visual morphology, weight percent gain, volume shrinkage and color change, combined with X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and derivative thermogravimetry (DTG) analyses. Results show CIM significantly enhances material penetration, especially for PEG, which achieved a 102% weight gain, more than double that of TSM, with minimal shrinkage and an acceptable color change. CIM might promotes the formation of hydrogen bonds between conservation materials and wood, offering an efficient method for conservation material penetration.
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