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Positron annihilation and polymerization of epoxy

✍ Scribed by T. Suzuki; Y. Ito; K. Endo; S. Fujita

Book ID
103922274
Publisher
Elsevier Science
Year
1989
Weight
361 KB
Volume
40
Category
Article
ISSN
0883-2889

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✦ Synopsis

Positron lifetime measurement has been applied to the investigation of solidification from the liquid state to the solid state in epoxy with different mixing ratios of resin and hardener. It has been shown that the mixing ratios and the physical states of liquid, gel, and solid affect positronium formation. In samples with an excess of hardener, long-lived components were observed in the liquid and gel states, while they disappeared after solidification. Positronium formation in epoxy is strongly affected by the heating process of epoxy samples.

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## Abstract Positron annihilation spectroscopy has been used to study free volume in an arnine‐cured epoxy as a function of external pressure at temperatures above and below the glass transition temperature. The observed __ortho__‐positronium lifetime Ο„~3~ and formation probability __I__~3~ decreas