缅甸血珀老化过程中老化特征与挥发份的变化

Ageing Characteristic and Volatile Change of Bloodish Amber from Myanmar in Ageing Process

琥珀在自然环境中会不可避免地发生老化,引起颜色加深变红、硬度减小、表面大量龟裂等不良现象,可导致表面严重老化剥落,对珍贵琥珀文物造成不可逆的伤害。本研究对缅甸血珀开展了显微特征、热力学特征及挥发份变化的研究,探讨了其老化过程中的物理特征与成分、结构的变化关系。在老化过程中,缅甸血珀结构的交联程度不断降低,同时挥发份种类和含量普遍下降。当血珀老化后颜色变为棕色时,部分大分子链氧化并降解为小分子,这是琥珀龟裂产生的重要原因。当小分子生成物Tetralin,6-acetyl-8-isopropyl-2,5-dimethyl-大量出现时,可指示该老化缅甸琥珀需低氧黑暗条件下保存。本研究探索了热力学和色谱质谱学在有机宝石中的分析应用,其研究结果可为老化琥珀文物的保护提供建议。

Amber aging is an inevitable process in the natural environment,which can cause adverse effects such as colour deepening and turning red,hardness decreasing,and a large number of cracks on the surface,leading to the serious spalling on the surface,causing irreversible damage to the precious amber relics.This study investigated the microscopic characteristics,thermodynamic characteristics and volatile matter changes of the bloodish amber from Myanmar,and discussed the transformed relationship between physical properties and composition/structure changes in the ageing process.The degree of crosslinking structure of bloodish amber from Myanmar was gradually decreasing in ageing process,while the varieties and contents of volatiles were declining.A portion of macromolecule were oxidized and degraded to micromolecule when the colour of aged bloodish amber was turning brown,which was the vital reason of cracking production.Tetralin,6-acetyl-8-isopropyl-2,5-dimethyl-,as a micromolecule,could indicate the urgency of the dark conserving environment with low oxygen for aged amber from Myanmar.This research explored the analytical application of thermodynamics and chromatography/mass spectrometry in the organic gemstones,and the research results could provide protection suggestion for the aged amber relics.