Broadband dielectric spectroscopy on the molecular dynamics in dendritic model systems

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