氯化脂肪酸之分子鏈長度對木材化學及熱性質之影響

Effects of Chain Length of Fatty Acid Chlorides on the Chemical and Thermal Properties of Wood

吳志鴻(Jyh-Horng Wu) ； 童鈺棠(Yu-Tang Tung) ； 黃志煜(Chih-Yu Huang) ； 蔡明桐(Meng-Thong Chua) ； 張上鎮(Shang-Tzen Chang)

《中華林學季刊》 37卷2期 (2004/06) Pp. 205-211

https://doi.org/10.30064/QJCF.200406.0008

摘要

本研究利用氯化辛醯、氯化十二醯、氯化十六醯於無溶劑系統中對木質殘料（刨屑）進行酯化反應，並利用散反射紅外線光譜、X-ray繞射及熱重分杠醇儀器分析試材化學及熱性質變化，以探討氯化脂肪酸碳鏈長度對試材性質之影響。試驗結果發現，木質殘料經氯化辛醯處理後具有較高醋化程度及熱安定性。藥劑碳鏈長度增加，除降低纖維素經基之可及性而影響醯化程度外，亦會降低試材熱安定性，並加劇試材明度與色相差值。

關鍵字

氯化辛醯 ； 氯化十二醯 ； 氯化十六醯 ； 酯化反應 ； 可及性 ； 熱安定性

並列摘要

In this study, wood sawdust was esterified by solvent-free acylation with octanoyl chloride, lauroyl chloride, and palmitoyl chloride. After esterification, diffuse reflectance Fourier transform infrared spectroscopy (DRIFT), X-ray diffraction (XRD), and thermogravimetric analysis (TGA) were used to evaluate the effects of carbon-chain length of reagents on the chemical and thermal properties of wood sawdust. Octanoylated wood sawdust had the excellent performance including the extent of esterification, and thermal stability. Increasing the chain length of fatty-acid chlorides not only decreases those properties mentioned above, but also decreases the accessibility of reagents. In addition, the lightness difference (△\L*) and hue difference (△H*) of esterified sawdust are enhanced by increasing the chain length of fatty acid chlorides.

並列關鍵字

Octanoyl chloride ； Lauroyl chloride ； Palmitoyl chloride ； Esterification ； Accessibility ； Thermal stability