Broadband dielectric spectroscopy on the molecular dynamics in dendritic model systems

Broadband dielectric spectroscopy (10(-1)-10(7) Hz) is employed to study the molecular dynamics in a set of dendritic poly(ether amide)s involving three generations. In the amorphous systems a dynamic glass transition is found which scales well with calorimetric data. Additionally, one broadened or two frequency separated secondary relaxations are detected. They are assigned to local fluctuations of the ester, amide, and Boc-protected amine groups. This interpretation is confirmed by IR spectroscopy and calculations of the dipole moment of the fluctuating moieties.