Positron Annihilation Lifetime of Irradiated Polyimide

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

doi:10.4028/www.scientific.net/MSF.733.151

Paper Titles

Positron and Charged Ion Diffusion and the Effective Interactions in the Liquid Phase
p.132

In Situ Positron Lifetime Measurement for the Strained Polyethylene
p.139

Positron Irradiation Effects in HDPE during PAL Measurement at Ambient Temperature
p.143

Positron Lifetimes and Mechanical Properties of Gamma-Irradiated Ultra High Molecular Weight Polyethylene
p.147

Positron Annihilation Lifetime of Irradiated Polyimide
p.151

Effect of Crosslinkers on the Microstructure and Swelling Properties of the N-Isopropyl Acrylamide Gels: A Positron Annihilation Study
p.155

Effect of Hydrophilicity of the Sidechains on the Amorphous Structure of Polypropylene Derivatives Studied by Positronium Lifetime Measurements
p.159

Positron Lifetimes and Crystallinity of γ-Irradiated Polypropylenes
p.163

Positronium Lifetime Study on Subnanoscopic Structure of Polyrotaxane
p.167

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Positron Annihilation Lifetime of Irradiated Polyimide

Abstract:

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.