THE GLASS TRANSITIONS OF ALIPHATIC IONENES.
MCGILL UNIV MONTREAL (QUEBEC)
Pagination or Media Count:
The glass transition temperatures of a wide range of ionenes have been studied as a function of the spacing of ions and the dielectric constant of the plasticizer. For solvents of a high dielectric constant the extrapolated glass transition of most ionenes has a value of ca. OC, while for plasticizers of a low dielectric constant the value centers around -80C. It is suggested that a conformational transition is responsible for this drastic change in the extrapolated Tg values. A qa effect was also found, the slope of the Tg vs. qa plot being 695, i.e. quite similar to that for the phosphates, silicates and acrylates. Author