| Issue |
J. Phys. IV France
Volume 03, Number C4, Septembre 1993
4th International Workshop on Positron and Positronium Chemistry
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|---|---|---|
| Page(s) | C4-249 - C4-252 | |
| DOI | https://doi.org/10.1051/jp4:1993437 | |
4th International Workshop on Positron and Positronium Chemistry
J. Phys. IV France 03 (1993) C4-249-C4-252
DOI: 10.1051/jp4:1993437
1 National Laboratory for High Energy Physics, Radiation Control Center, Oho, Tsukuba, Ibaraki 305, Japan
2 Tsukuba Research Laboratory, Sumitomo Chemical Co. LTD, Kitahara, Tsukuba, Ibaraki 300-32, Japan
3 Research Center for Nuclear Science and Technology, The University of Tokyo, Tokai, Ibaraki 319-11, Japan
© EDP Sciences 1993
J. Phys. IV France 03 (1993) C4-249-C4-252
DOI: 10.1051/jp4:1993437
Water absorption in novolac epoxy resins studied by positron annihilation
T. MIURA1, T. SUZUKI1, Y. OKI1, M. NUMAJIRI1, K. KONDO1, Y. SHIOMI2 and Y. ITO31 National Laboratory for High Energy Physics, Radiation Control Center, Oho, Tsukuba, Ibaraki 305, Japan
2 Tsukuba Research Laboratory, Sumitomo Chemical Co. LTD, Kitahara, Tsukuba, Ibaraki 300-32, Japan
3 Research Center for Nuclear Science and Technology, The University of Tokyo, Tokai, Ibaraki 319-11, Japan
Abstract
Water absorption rates of four kinds of epoxy resins cured with phenol novolac (PH) were compared with the results of positron annihilation lifetime measurements (PAL). Three samples : cresol novolac (CR), tetra-methyl-biphenol (TMB) and bis-phenol A (BA), showed almost similar absorption rates, while tris-hydroxy-phenyl-methane (THPM) absorbed water twice as fast as others. Since THPM has a larger τ3 value (hence larger intermolecular-space holes) than the other samples, the correlation between τ3 and the absorption rate seems evident. For THPM, the lifetime distribution was shifted toward a shorter lifetime after absorbing water, which is interpreted in terms of the particular structure of three-dimensional holes.
© EDP Sciences 1993