Institute of Chemical Technologies and Analytics, Analytical Chemistry Division, Vienna University of Technology, Getreidemarkt 9/161, 1060 Vienna, Austria.
Anal Bioanal Chem. 2011 Mar;399(9):2961-76. doi: 10.1007/s00216-010-4357-5. Epub 2010 Nov 3.
This study characterizes and identifies two different acrylic binding media such as Plextol® D498 and Primal® AC33, which are widely used in modern and contemporary art. In order to investigate their fast photooxidative deterioration when exposed to ultraviolet (UV) light, ageing studies on these materials were carried out. For this purpose, pure synthetic materials but also mixed with different inorganic pigments were identified and characterized before and after UV exposure by means of pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). Particular attention was paid to the comparison of two different analytical methods: (1) single-shot method based on a pyrolysis for the analysis of polymers and (2) double-shot method, which allows a unique combination of thermal desorption for the analysis of volatile compounds and pyrolysis of the polymers themselves. These analyses have been complemented by Fourier transform infrared spectroscopy-attenuated total reflectance (FTIR-ATR) studies. The comparison of the results obtained from unaged samples and UV-aged clearly showed material alterations as well as the formation of new products, which were recorded by FTIR-ATR. Generally, these changes were more pronounced when the acrylic binding media were mixed with pigments. The double-shot technique of Py-GC/MS additionally allowed the detection of the phenolic antioxidant in unaged Plextol® D498, but no oxidation products could be identified by Py-GC/MS in all samples.
本研究对两种广泛应用于现代和当代艺术的不同丙烯类黏合材料（如 Plextol® D498 和 Primal® AC33）进行了特征描述和鉴别。为了研究它们在暴露于紫外（UV）光下的快速光氧化劣化，对这些材料进行了老化研究。为此，通过热裂解-气相色谱/质谱联用（Py-GC/MS）分析，对暴露于 UV 光前后的纯合成材料以及与不同无机颜料混合的材料进行了鉴别和特性描述。特别关注两种不同分析方法的比较：（1）单次进样法，基于聚合物的热裂解分析；（2）双次进样法，可将热解用于聚合物自身的挥发性化合物分析与热解结合起来。这些分析通过傅里叶变换红外光谱衰减全反射（FTIR-ATR）研究得到了补充。未老化和 UV 老化样品的结果比较清楚地表明了材料的变化以及新产物的形成，这些变化通过 FTIR-ATR 记录下来。一般来说，当丙烯类黏合材料与颜料混合时，这些变化更为明显。Py-GC/MS 的双次进样技术还可以检测未老化的 Plextol® D498 中的酚类抗氧化剂，但在所有样品中，Py-GC/MS 都无法识别出氧化产物。
