Abstract

This work follows a previous one dealing with the state of conservation study of the wooden part of the roman Acqualadroni rostrum soon after its finding in the seabed of Acqualadroni (Messina, Italy). The archaeological survey and recovery were particularly relevant since this artefact is one of the two rostrums, nowadays known, found together with its wooden part. Following the recovery, it was consolidated by immersion in a melamine-formaldehyde resin (Kauramin) aqueous solution for eight months at the “Centro di Restauro del Legno Bagnato” (Pisa, Italy). The present investigation is aimed to determine at microscopic scale the wood state of conservation and to highlight interactions of the consolidant with wood components, by using solid-state NMR spectroscopy ten years after the consolidation treatment. Sampling by coring was exceptionally authorized, and the wood core was divided into seven aliquots as a function of depth. ¹³C cross-polarization magic angle spinning (¹³C{¹H} CP-MAS NMR) spectra and variable contact time (VCT) experiments have been carried out to determine the cellulose crystallinity index, the lignin condensation degree and the holocellulose-lignin ratio. The interactions between the resin and the wood components were highlighted by T_1ρH relaxation times determination and two-dimensional ¹³C–¹H correlation (FSLG CP HETCOR) NMR experiments. Findings revealed specific interactions between the aromatic part of the resin and the lignin, as well as a network of hydrogen bonds involving all components of the system.

Graphic abstract

中文翻译：

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罗马Acqualadroni讲台的固态NMR研究：木质部件固结处理的十年评估

摘要

这项工作是在前一个工作于罗马Acqualadroni讲台的木质部分在Acqualadroni（意大利墨西拿）的海底发现后进行的。考古调查和恢复尤为重要，因为此文物是当今发现的两个讲台及其木制部分之一。回收后，通过在“ Centro di Restauro del Legno Bagnato”（意大利比萨）中将其浸入三聚氰胺-甲醛树脂（Kauramin）水溶液中八个月来进行固结。本研究旨在通过在固结处理十年后使用固态NMR光谱技术在微观尺度上确定木材的养护状态，并突出固结剂与木材成分的相互作用。^{已经进行了13} C交叉极化魔术角旋转（¹³ C { ¹ H} CP-MAS NMR）光谱和可变接触时间（VCT）实验，以确定纤维素的结晶度指数，木质素缩合度和全纤维素-木质素比。_T1ρH弛豫时间测定和二维¹³ C– ¹ H相关性（FSLG CP HETCOR）NMR实验突显了树脂与木材成分之间的相互作用。研究发现揭示了树脂的芳香部分与木质素之间的特定相互作用，以及涉及该系​​统所有组分的氢键网络。

图形摘要