POLYMERIZATION OF BISPHENOL-A DICYANATE STUDIED BY POSITRON ANNIHILATION

摘要

A polymerization process of Bisphenol-A dicyanate (BADCy) has been studied by a positron annihilation lifetime (PAL) technique. In the process, BADCy was cured through triazine ring formation by heating; the state changed from a powder at room temperature, through a liquid above the melting point, to a solid after curing at high temperatures. It has been shown that PAL is a powerful technique for studying microscopic structure changes and the state transition of the continuous polymerization process.