Local free volumes in boron-bombarded Kapton polyimide: A positron lifetime study

G. Dlubek*, R. Buchhold, Ch Hübner, A. Nakladal, K. Sahre

*Corresponding author for this work
8 Citations (Scopus)

Abstract

The bombardment of thin films of Kapton polyimide with energetic boron ions can lead to an increase in the maximum mass uptake from 3.9 to 14% at 100% relative humidity. It can be estimated that the number of No of free-volume sites increases from 1.8 to 6.5 nm on boron bombardment, assuming that each sorption site accommodates exactly one water molecule. Boron irradiation also leads to a notably increased curvature of the convex absorption isotherm indicating that the mean hole size υ decreases significantly below a value of 0.1 nm3. Position annihilation lifetime (PAL) spectroscopy is used to study the microstructure of the modified films after boron bombardment.

Original languageEnglish
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume37
Issue number17
Pages (from-to)2539-2543
Number of pages5
ISSN0887-6266
DOIs
Publication statusPublished - 01.09.1999

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