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  • 1 National Laboratory for High Energy Physics 305 Tsukuba, Ibaraki (Japan)
  • | 2 The Graduate University for Advanced Studies 305 Tsukuba, Ibaraki (Japan)
  • | 3 Sumimoto Chemical Fine Chemicals Research Laboratory 300-32 Tsukuba (Japan)
  • | 4 The University of Tokyo, c/o JEARI RCNST Tokai-mura 319-11 Ibaraki (Japan)
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The polymerization process of bisphenol-A dicyanate (BADCy) has been studied using a positron-annihilation lifetime technique (PAL). The polymerization was conducted at 150°C, and the process was followed by PAL. Seven kinds of samples with different curing times were also formed at 150°C, and the relation between the period of the curing time and the degree of polymerization was studied. It has been shown that theo-Ps lifetime increases in samples with a higher polymerization than 85%, which is consistent with measurements of the specific volume of BADCy.