Positron annihilation lifetime of irradiated polyimide

Tetsuya Hirade, Toshitaka Oka, Norio Morishita, Akira Idesaki, Akihiko Shimada

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Citations (Scopus)


Ortho-positronium pick off annihilation lifetime gives the information of the microscopic free volume of polymers. Polyimide polymers such as Kapton are applied in many fields, but it was impossible to apply the positron lifetime method for free volume investigation because of no positronium formation. Here, we apply the idea of the free positron annihilation probability that is sum of the probability of annihilation by the positron and electrons on the molecular chain where the positron localized and that for the annihilation with the electrons on the neighboring molecular chains. The second term is probably affected by the free volume change. We have successfully shown the temperature dependence and the electron beam irradiation effect on the free volume change by observing the free positron annihilation lifetime for Kapton.

Original languageEnglish
Title of host publicationPositron and Positronium Chemistry X
PublisherTrans Tech Publications Ltd
Number of pages4
ISBN (Print)9783037855188
Publication statusPublished - 2013
Event10th International Workshop on Positron and Positronium Chemistry, PPC-10 - Smolenice Castle, Slovakia
Duration: 2011 Sep 52011 Sep 9

Publication series

NameMaterials Science Forum
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752


Other10th International Workshop on Positron and Positronium Chemistry, PPC-10
CitySmolenice Castle


  • Electron irradiation
  • Free volume
  • Kapton
  • Lifetime
  • Polyimide
  • Positron
  • Temperatures

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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