The identification of synthetic organic red pigments in historical plastics: Developing an in situ analytical protocol based on Raman microscopy,Journal of Raman Spectroscopy

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The identification of synthetic organic red pigments in historical plastics: Developing an in situ analytical protocol based on Raman microscopy
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2020-09-13 , DOI: 10.1002/jrs.5985
Eva Mariasole Angelin ₁ , Susana França de Sá ₁ , Marcello Picollo ₂ , Austin Nevin _{3,

4} , Maria Elvira Callapez ₅ , Maria João Melo ₁

Affiliation

The identification of colorants in historic plastics is a methodological and analytical challenge. Although deformulation is performed by the plastics industry, in the case of historical objects, sampling is often impossible, and in situ protocols are needed. The accurate identification of colorants provides insights into historical plastic formulations, supports planning of conservation studies, and critical data for objects that already exhibit color change (e.g. fading). Indeed, colorants may degrade following exposure to light, and color changes have been reported for plastic objects. The analysis of colorants remains a challenge, and microsampling is usually required. Successful identification of red pigments from thirty historical plastics is reported following a new in situ analytical protocol based on Raman microscopy. Information about other pigments, fillers and plastic polymers are reported. Fading has been observed in the historical plastic objects containing Pigment Red 53.

中文翻译：

鉴定历史塑料中的合成有机红色颜料：基于拉曼显微镜开发原位分析方案

鉴定历史塑料中的着色剂是方法学和分析上的挑战。尽管变形是由塑料行业执行的，但在历史物体的情况下，采样通常是不可能的，并且需要原位协议。着色剂的准确识别可提供对历史塑料配方的见识，支持保护性研究的计划以及已变色（例如褪色）的物体的关键数据。确实，着色剂在暴露于光线后可能会降解，并且已经报道了塑料物体的颜色变化。着色剂的分析仍然是一个挑战，通常需要微量取样。根据基于拉曼显微镜的新原位分析规程，报道了从三十种历史塑料中成功鉴定出红色颜料的报道。报告了有关其他颜料，填料和塑料聚合物的信息。在含有颜料红53的历史塑料物品中已观察到褪色。

更新日期：2020-09-13

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