Synthesis and characterisation of lignin-like oligomers as a bio-inspired consolidant for waterlogged archaeological wood
Synthesis and characterisation of lignin-like oligomers as a bio-inspired consolidant for waterlogged archaeological wood
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DOI：
10.1515/pac-2016-0814
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发表时间：
2016-11-01
影响因子：
1.8
通讯作者：
Kutzke, Hartmut
中科院分区：
文献类型：
--
作者：
McHale, Emily;Braovac, Susan;Kutzke, Hartmut
从可持续来源开发新材料用于加固浸水的考古木材是一个重要的研究领域，因为今天最广泛使用的加固剂是石油基的。理想情况下，新的加固剂将与现有的木结构相互作用，确保最大的兼容性。木质素通常是考古木材中残留的主要成分，因为它比综纤维素更不易降解。因此，为了最大化与木材细胞相互作用的可能性，已经使用水溶性铜salen催化剂在pH 10下从异丁香酚合成木质素样低聚物，得到1.6kDa的重均M-w。通过NMR光谱分析表明，低聚物具有木质素样结构，具有β-O-4 '、β-β'和β-5 '连接。如通过FTIR光谱法测定的，发现低聚物在乙酸乙酯中的10 w/w %溶液在浸渍14天后完全渗透浸过水的考古木材（密度为0.146 g/mL，最大含水量为620%）的1 cm（3）样品。通过SEM看不到浸渍材料，表明其在干燥时包覆细胞壁。这表明，脱氢聚合物渗透浸水考古木材以及有潜力被开发成固化剂。
The development of new materials for the consolidation of waterlogged archaeological wood from sustainable sources is an important area of research, as the most widely used consolidant today is petroleum based. Ideally a new consolidant will interact with the existing wood structure, ensuring maximum compatibility. Lignin is often the major component remaining in archaeological wood, as it is less susceptible to degradation than holocellulose. Therefore, in order to maximise the potential for interaction with the wood cells, lignin-like oligomers have been synthesized from isoeugenol using a water soluble copper salen catalyst at pH 10, giving a weight average M-w of 1.6 kDa. Analysis by NMR spectroscopy has shown that the oligomers have a lignin-like structure with beta-O-4', beta-beta' and beta-5' connections. A 10 w/w % solution of the oligomers in ethyl acetate was found to thoroughly penetrate 1 cm(3) samples of waterlogged archaeological wood (density of 0.146 g/mL, maximum water content of 620 %) after 14 days impregnation, as determined by FTIR spectroscopy. No impregnation material could be seen by SEM, suggesting that it coats the cell walls upon drying. This indicates that dehydrogenated polymers penetrate waterlogged archaeological wood well and have the potential to be developed into consolidants.