Facility for determining action spectra of UV photodegradation

Anna Vaskuri (Corresponding author), Petri Kärhä, Anu Heikkilä, Erkki Ikonen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

We have developed an ultraviolet (UV) ageing facility consisting of a spectrograph which can be used to expose material samples with spectrally dispersed UV radiation at the wavelength range 273 - 423 nm, and an automated, high-resolution laser-based setup for measuring the induced color changes in the transmittances of the exposed samples. The samples are scanned using a suitable laser wavelength to obtain the wavelength dependence on the color change. The locations on the samples are converted to exposure wavelengths with the known dispersion of the spectrograph. We demonstrate the facility by exposing and measuring a set of atactic polystyrene sheets. By studying samples aged for different time periods we derive a complex action spectrum for the photoyellowing that is nonlinear with respect to the radiant exposure. We further derive linear activation spectra for the photoyellowing demonstrating how they depend on the selected threshold level.
Original languageEnglish
Title of host publicationRadiation Processes in the Atmosphere and Ocean (IRS2016)
Subtitle of host publicationProceedings of the International Radiation Symposium (IRC/IAMAS)
EditorsWerner Schmutz, Roger Davies, Luca Egli
PublisherAmerican Institute of Physics AIP
Number of pages4
Volume1810
ISBN (Electronic)9780735414785
ISBN (Print)978-0-7354-1478-5
DOIs
Publication statusPublished - 22 Feb 2017
MoE publication typeA4 Article in a conference publication
EventInternational Radiation Symposium 2016, IRS 2016: Radiation Processes in the Atmosphere and Ocean - Auckland, New Zealand
Duration: 16 Apr 201722 Apr 2017

Publication series

NameAIP Conference Proceedings
PublisherAIP Publishing
Volume1810
ISSN (Print)0094-243X

Conference

ConferenceInternational Radiation Symposium 2016, IRS 2016
Abbreviated titleIRS 2016
CountryNew Zealand
CityAuckland
Period16/04/1722/04/17

Fingerprint

wavelengths
spectrographs
color
ultraviolet radiation
lasers
transmittance
polystyrene
activation
thresholds
high resolution

Cite this

Vaskuri, A., Kärhä, P., Heikkilä, A., & Ikonen, E. (2017). Facility for determining action spectra of UV photodegradation. In W. Schmutz, R. Davies, & L. Egli (Eds.), Radiation Processes in the Atmosphere and Ocean (IRS2016): Proceedings of the International Radiation Symposium (IRC/IAMAS) (Vol. 1810). [110011] American Institute of Physics AIP. AIP Conference Proceedings, Vol.. 1810 https://doi.org/10.1063/1.4975573
Vaskuri, Anna ; Kärhä, Petri ; Heikkilä, Anu ; Ikonen, Erkki. / Facility for determining action spectra of UV photodegradation. Radiation Processes in the Atmosphere and Ocean (IRS2016): Proceedings of the International Radiation Symposium (IRC/IAMAS). editor / Werner Schmutz ; Roger Davies ; Luca Egli. Vol. 1810 American Institute of Physics AIP, 2017. (AIP Conference Proceedings, Vol. 1810).
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Vaskuri, A, Kärhä, P, Heikkilä, A & Ikonen, E 2017, Facility for determining action spectra of UV photodegradation. in W Schmutz, R Davies & L Egli (eds), Radiation Processes in the Atmosphere and Ocean (IRS2016): Proceedings of the International Radiation Symposium (IRC/IAMAS). vol. 1810, 110011, American Institute of Physics AIP, AIP Conference Proceedings, vol. 1810, International Radiation Symposium 2016, IRS 2016, Auckland, New Zealand, 16/04/17. https://doi.org/10.1063/1.4975573

Facility for determining action spectra of UV photodegradation. / Vaskuri, Anna (Corresponding author); Kärhä, Petri; Heikkilä, Anu; Ikonen, Erkki.

Radiation Processes in the Atmosphere and Ocean (IRS2016): Proceedings of the International Radiation Symposium (IRC/IAMAS). ed. / Werner Schmutz; Roger Davies; Luca Egli. Vol. 1810 American Institute of Physics AIP, 2017. 110011 (AIP Conference Proceedings, Vol. 1810).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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AB - We have developed an ultraviolet (UV) ageing facility consisting of a spectrograph which can be used to expose material samples with spectrally dispersed UV radiation at the wavelength range 273 - 423 nm, and an automated, high-resolution laser-based setup for measuring the induced color changes in the transmittances of the exposed samples. The samples are scanned using a suitable laser wavelength to obtain the wavelength dependence on the color change. The locations on the samples are converted to exposure wavelengths with the known dispersion of the spectrograph. We demonstrate the facility by exposing and measuring a set of atactic polystyrene sheets. By studying samples aged for different time periods we derive a complex action spectrum for the photoyellowing that is nonlinear with respect to the radiant exposure. We further derive linear activation spectra for the photoyellowing demonstrating how they depend on the selected threshold level.

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Vaskuri A, Kärhä P, Heikkilä A, Ikonen E. Facility for determining action spectra of UV photodegradation. In Schmutz W, Davies R, Egli L, editors, Radiation Processes in the Atmosphere and Ocean (IRS2016): Proceedings of the International Radiation Symposium (IRC/IAMAS). Vol. 1810. American Institute of Physics AIP. 2017. 110011. (AIP Conference Proceedings, Vol. 1810). https://doi.org/10.1063/1.4975573