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对聚乙烯糖醇在三波长紫外线照射下衰老行为的研究

Mingyu Shang¹, Yanfei Wei², Herong Zhou¹

¹State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology Wuhan 430081 China zhouhr_9@163.com.

|November 29, 2023

概括

用于保存木制遗迹的聚乙烯甘醇 (PEG2000) 在紫外线下降解,特别是在313nm. 这项研究揭示了PEG2000.

科学领域:

材料科学材料科学材料科学
化学化学化学
保护科学保护科学

背景情况:

聚乙烯甘醇 (PEG2000) 对于保存浸水的木制文化遗迹至关重要.
PEG2000的光衰老降解对这些文物的长期保存构成重大威胁.

研究的目的:

在紫外线照射下研究PEG2000的光衰老特性和机制.
了解紫外线暴露如何影响PEG2000的物理和化学特性.
建立可靠的方法来评估PEG2000的衰老程度.

主要方法:

在三种波长的紫外线下对PEG2000光衰老的全面调查.
表面形态,晶体结构和相对分子重量的表征.
使用的技术包括SEM,FTIR和1H-NMR光谱.
使用光泽度测量和FTIR光谱学评估老化程度.

主要成果:

在长时间的紫外线照射下,PEG2000表现出光泽损失,碳烯指数和结晶度的增加.
降解从表面到PEG2000的内部进行,改变了晶体结构.
光化学反应涉及C-H和C-O-C键裂变,形成和基组.
313nm紫外线辐射导致最显著的降解.

结论:

光泽损失率和碳酸指数的组合为评估PEG2000老化提供了一个合适的方法.
了解PEG2000光降解机制对于改善保护策略至关重要.
这项研究为PEG2000在浸水木制文化遗迹中的长期保存提供了理论指导.

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