Analytical and Bioanalytical Chemistry

, Volume 403, Issue 5, pp 1405–1414 | Cite as

Characterisation of historic plastics using terahertz time-domain spectroscopy and pulsed imaging

  • Gianluca Pastorelli
  • Tanja Trafela
  • Phillip F. Taday
  • Alessia Portieri
  • David Lowe
  • Kaori Fukunaga
  • Matija Strlič
Original Paper

Abstract

Terahertz (THz) time-domain spectroscopy and 3D THz pulsed imaging have been explored with regard to polymer materials, both commodity and historic polymers. A systematic spectroscopic study of a wide range of different polymer materials showed significant differences in their spectra. Polyolefins and polystyrenes generally exhibit lower absorption than other examined polymers, various cellulose derivates, poly(vinyl chloride), poly(methyl methacrylate), polyamide, hard rubber and phenol formaldehyde resin, the last of these exhibiting the most intense absorption over the entire range, 0.15–4.2 THz. It was also examined how the presence of plasticisers in poly(vinyl chloride), the presence of fillers in polypropylene, and the degree of branching in polyethylene and polystyrene affect the spectra; inorganic fillers in polypropylene affected the absorption most. With 3D THz pulsed imaging, features in polymer objects were explored, appearing either as integral parts of the material (coatings and pores in foams) or as a consequence of physical deterioration (cracks, delamination). All of these features of various complexities can be successfully imaged in 3D. Terahertz technology is thus shown to have significant potential for both chemical and structural characterisation of polymers, which will be of interest to heritage science, but also to the polymer industry and development of analytical technologies in general.

Keywords

Terahertz time-domain spectroscopy Terahertz pulsed imaging Polymers Degradation Heritage science 

Notes

Acknowledgements

The authors gratefully acknowledge funding from the European Community 7th Framework Programme under the grant agreement no. 212218 (Popart - Preservation of plastic artefacts in museum collections), the Slovenian Research Agency (Programme P1-0153), and Ad futura, Slovenian Human Resources and Scholarship Fund.

Supplementary material

216_2012_5931_MOESM1_ESM.pdf (499 kb)
ESM 1 (PDF 499 kb)

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Gianluca Pastorelli
    • 1
  • Tanja Trafela
    • 2
  • Phillip F. Taday
    • 3
  • Alessia Portieri
    • 3
  • David Lowe
    • 3
  • Kaori Fukunaga
    • 4
  • Matija Strlič
    • 1
  1. 1.Centre for Sustainable Heritage, Bartlett School of Graduate StudiesUniversity College LondonLondonUK
  2. 2.University of LjubljanaFaculty of Chemistry and Chemical TechnologyLjubljanaSlovenia
  3. 3.TeraView LtdCambridgeUK
  4. 4.Applied Electromagnetic Research CenterNational Institute of Information and Communications TechnologyKoganeiJapan

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