橋かけ高分子の誘電分散

抄録

The dielectric behavior of crosslinked polymers containing 11-membered ring (β-relaxation) has been investigated in connection with the dynamic mechanical properties. Control of the mobility of the ring structure and its homologous structures involved in the crosslinked polymers was attempted by modification of the substituents at the 1-or 1, 2-position of diallyl succinate, and the diallyl succinate monomers were derived from the succinic acid and its derivatives: succinic acid (designated as DASu), methyl succinic (DAMeSu) acid; cis-1, 2-dicarboxylic acids of cyclopropane (30C), cyclobutane (40C) and cyclohexane (60C); dihydrohymic acid and phthalic acid (HHAC and DAP). The results of the investigation are as follows: All the crosslinked polymers exhibit β-relaxation at 20°C when measured at 30KHz, which is presumably associated with the local motion of side chains of the polymers. The energy of activation is ΔH^≠=11-14Kcal/mole, ΔS^≠=10-20cal/mole. 60C shows an abomalous behavior presumably owing to the existence of cyclohexyl ring which flips between the chair-chair forms.