Water intake of cellulose materials monitored by positron annihilation lifetime spectroscopy

Laura Resch*, Anna Karner, Wolfgang Sprengel, Roland Würschum, Robert Schennach

*Korrespondierende/r Autor/-in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikelBegutachtung

Abstract

In this study, for the first time, the experimental technique of positron annihilation lifetime spectroscopy (PALS) has been applied to monitor in situ the microstructural changes of cellulose-based materials, i.e. paper, during water intake. For three different cellulose samples, bleached fine paper without filler, Kraft paper without filler, and a viscose fiber sheet, the mean positron lifetime Δ τ mean showed a strong increase with time in humid atmosphere, but exhibiting different trends depending on the type of sample. For all the cellulose samples investigated, the mean positron lifetime Δ τ mean shows an initial strong increase simultaneously occurring (t<10 h) to the mass increase of the samples due to water intake. Interestingly, the variations of Δ τ mean of the viscose fiber sheet and the Kraft paper sample both show a second increase on longer timescales (t>60 h in humid atmosphere) during which the mass increase of these samples has already been saturated. The results of this study show that by the means of PALS, water transport in paper can be reliably followed over a long timespan and it is even possible to distinguish between different types of cellulose materials. The second stage increase of the mean positron lifetime after long times in humid atmosphere for the Kraft paper sample and the pure viscose sheets even suggest that not only water intake itself can be monitored but also further atomistic processes in the material are accessible.

Originalspracheenglisch
Seiten (von - bis)1357–1363
Seitenumfang7
FachzeitschriftCellulose
Jahrgang29
Ausgabenummer3
DOIs
PublikationsstatusVeröffentlicht - Feb 2022

Schlagwörter

  • Positron annihilation
  • lifetime spectrocopy
  • water transport
  • Cellulose

ASJC Scopus subject areas

  • Physik der kondensierten Materie
  • Polymere und Kunststoffe

Fields of Expertise

  • Advanced Materials Science

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