A first approach into the characterisation of historical plastic objects by in situ diffuse reflection infrared Fourier transform (DRIFT) spectroscopy

Soares, Inês; Sá, Susana França de; Ferreira, Joana Lia

doi:10.1016/j.saa.2020.118548

Cited by 10 publications

(8 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…47 Due to the characteristic profiles of such distortions in HDPE reflectance spectra, these bands and their specific spectral shapes can be used as markers to identify PE in plastic objects, as already proposed by Soares et al. 12…”

Section: Resultsmentioning

confidence: 97%

“…Reflectance spectra of abraded and non-abraded surfaces of the references were acquired with both ER FT-IR and DRIFTS modes, following a strategy already adopted. 12…”

Section: Resultsmentioning

confidence: 99%

“…Since surface abrasion is a damage commonly found in historical plastic objects, the analysis of such areas could be used to collect vibrational spectra would appear alike to conventional transmission FT-IR spectra. This would allow for a more straightforward spectral interpretation, 12 especially when devices which favor the collection of diffuse reflection are used.…”

Section: Resultsmentioning

confidence: 99%

“…In both ER FT-IR spectra, IR reflectance markers for the acrylonitrile (ν(C ≡ N) at 2246 cm –1 ), butadiene (δ(C–H) 992 and 958 cm –1 ), and styrene (δ(C–C) aromatic ring at 774 and 712 cm –1 ) monomers were detected with a derivative-shaped band profile 12,56 (Fig. 7).…”

Section: Resultsmentioning

confidence: 99%

“…7–11 Relatively little research has instead been conducted in analyzing cultural plastic objects using a portable diffuse reflection infrared Fourier transform spectroscopy (DRIFTS) device. 12 Even though comparison between different IR acquisition modes is available in literature for the characterization of cultural heritage plastics, 7 no systematic studies have been carried out assessing the application of both ER FT-IR and DRIFTS configurations. The present paper is framed in this research and compares two portable FT-IR spectrometers for plastic analysis: Alpha Bruker Optics and Agilent Handheld 4300 working in ER FT-IR and DRIFTS modes, respectively.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Application of Infrared Reflectance Spectroscopy on Plastics in Cultural Heritage Collections: A Comparative Assessment of Two Portable Mid-Fourier Transform Infrared Reflection Devices

et al. 2021

Self Cite

View full text Add to dashboard Cite

Plastics have been increasingly used to create modern and contemporary art and design, and nowadays, museum collections hold numerous objects completely or partially made of plastics. However, the preservation of these materials is still a challenging task in heritage conservation, especially because some plastics show signs of degradation shortly after their production. In addition, different degradation mechanisms can often take place depending on the plastic composition and appropriate environmental and packaging conditions should be adopted. Therefore, methods for in situ and rapid characterization of plastic artifactsâ composition are greatly needed to outline proper conservation strategies. Infrared (IR) spectroscopy, such as attenuated total reflection Fourier transform infrared spectroscopy (ATRâFTIR), is a well-established method for polymeric material analysis. However, ATR-FTIR requires an intimate contact with the object, which makes its application less appropriate for the in situ investigation of fragile or brittle degraded plastic objects. Mid-FTIR reflectance spectroscopy may represent a valid alternative as it allows in situ measurements with minimum or even no contact, and IR data can be acquired rapidly. On the other hand, spectral interpretation of reflectance spectra is usually difficult as IR bands may appear distorted with significant changes in band maximum, shape and relative intensity, depending on the optical properties and surface texture of the material analyzed. Presently, mid-FTIR reflection devices working in external reflection (ER-FTIR) and diffuse reflection (DRIFT) modes have been used in cultural heritage research studies. As the collected vibrational information depends on the optical layout of the measuring system, differences between ER-FTIR and DRIFT spectra are thus expected when the same polymer is analyzed. So far, ER-FTIR and DRIFT spectroscopy have been individually explored for the identification of plastic objects, but comparative studies between the application of two reflectance FTIR modes have not been presented yet. In this work, the use of two portable FTIR spectrometers equipped with ER-FTIR and DRIFT modes were compared for plastics identification purposes for the first time. Both references of polymeric materials and historical plastic objects (from a Portuguese private collection) were studied and the differences between ER-FTIR and DRIFT spectra were discussed. The spectra features were examined considering the two different optical geometries and analytesâ properties. This new insight can support a better understanding of both vibrational information acquired and practical aspects in the application of the ER-FTIR and DRIFT in plastic analysis.

show abstract

Section: Resultsmentioning

confidence: 97%

“…Reflectance spectra of abraded and non-abraded surfaces of the references were acquired with both ER FT-IR and DRIFTS modes, following a strategy already adopted. 12…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%