Evaluation of Epoxy Resin for Cryogenic Use by Positron Annihilation Method

The positron annihilation method has been used to evaluate the unoccupied space of epoxies aiming at the molecular design of epoxy for cryogenic use. The fracture toughness of the commercially available epoxies was measured and was compared with the life time τ3. The epoxy was found to be classified...

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Bibliographic Details
Published inTEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) Vol. 29; no. 7; pp. 329 - 332
Main Authors NISHIJIMA, Shigehiro, HONDA, Yoshihide, KOBAYASHI, Yoshinori, OKADA, Toichi, NAMBA, Shingo
Format Journal Article
LanguageEnglish
Published CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN 1994
Subjects
epoxy
fracture toughness
life time
positron annihilation
unoccupied space
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Summary:The positron annihilation method has been used to evaluate the unoccupied space of epoxies aiming at the molecular design of epoxy for cryogenic use. The fracture toughness of the commercially available epoxies was measured and was compared with the life time τ3. The epoxy was found to be classified into two types that is (i) those shows the increase of fracture toughness with free volume and (ii) those do not present large change with increasing free volume evaluated by positron annihilation. The former was understood as the system with disordered network and the latterr as that with different crosslinking density. The discussion suggests that the latter system is preferable for cryogenic use and was confirmed experimentally.
ISSN:0389-2441
1880-0408
DOI:10.2221/jcsj.29.329