- 期刊
以田口實驗設計法探討聚乙二醇和糖醇加固法對泡水文物之最佳化處理條件
Application of Taguchi Methods in the Optimization of Preservation Waterlogged Archaeological Wood by Treatment of Polyethylene Glycol and Lactitol/Mannitol/Trehalose
摘要
本研究利用田口實驗設計法（Taguchi methods），目的為以最少實驗組數嘗試探討「宜蘭農校遺址」泡水考古木材（Waterlogged archaeological wood）的最佳修復條件。所探討因子包含浸泡聚乙二醇（Polyethylene glycol, PEG），依分子量（200、600及4000）依序為PEG = 200／4000、PEG = 600/4000及PEG = 4000系統、乳糖醇／甘露醇／海藻糖重量比（7:2:1、6:2:2、5:2:3）、浸泡溫度（25℃、40℃、60℃）以及乾燥方法（氣乾法、烘乾法、冷凍乾燥法）。並利用掃描式電子顯微鏡（Scanning Electron Microscope）、傅立葉轉換紅外光譜（Fourier-Transform Infrared Spectroscopy）、尺寸縮收測量、色差計，比較PEG加固法和糖醇加固法之最適處理條件。從SEM結果顯示，相較於PEG 加固法，糖醇加固法可以更緻密的填充泡水考古木材中的空隙。而糖醇加固法以乳糖醇／甘露醇／海藻糖比例浸漬比例6:2:2、浸泡溫度在25℃、冷凍乾燥方式為最佳條件，所處理泡水木質文物具有最小的收縮率。
並列摘要
The main purpose of this study is to explore the optimal conditions by Taguchi methods for the preservation of waterlogged archaeological wood which was discovered in 1926 at Taiwan Provincial Ilan School of Agriculture and Forestry (Yilan, Taiwan). The factors including the molecular weight of polyethylene glycol (PEG), ratio of lactitol/mannitol/trehalose (7:2:1, 6:2:2, and 5:2:3), temperature (25℃, 40℃, and 60℃) and drying methods (constant temperature and humidity drying method, oven drying method, freeze drying method) were investigated in the size reduction and color difference for the preservation of waterlogged archaeological wood. The preservation of waterlogged archaeological wood by treatment of PEG and lactitol/mannitol/trehalose was analyzed by Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FTIR), size reduction measurement, and color difference meter. SEM images demonstrated that lactitol/mannitol/trehalose treatment had a significant increase of penetration in waterlogged archaeological wood for the stability of wood structure as compared to PEG method. The optimum combination for obtaining the smallest shrinkage of waterlogged archaeological wood with a smooth surface was determined to be a ratio of lactitol/mannitol/trehalose of 6:2:2, an immersion temperature of 25℃, and a freeze drying for lactitol/mannitol/trehalose treatment.