Effects of freeze-drying on the glass temperature of cyclic polystyrenes

S. L. Simon, P. Bernazzani, G. B. McKenna

Research output: Contribution to conferencePaperpeer-review

Abstract

The calorimetric glass temperature was measured for three cyclic polystyrenes with apparent molecular weights ranging from 4.0 × 10 3 to 195.5 × 10 3 g/mol for both bulk material and for samples freeze-dried from dilute solution. Freeze-drying from dilute solution was found to reduce the glass temperature by 7 to 14 K depending on the sample. These T g depressions are 5 to 12 K greater than those found previously for freeze-dried linear polystyrene. Annealing at 403.2 K and 443.2 K (130 °C and 170 °C) resulted in recovery of the T g back to the bulk value with the time scales depending on both temperature and the magnitude of the T g reduction; the low apparent activation energy dependence of the recovery of T g precludes its being due to viscous flow.

Original languageEnglish
Pages2252-2257
Number of pages6
StatePublished - 2004
EventANTEC 2004 - Annual Technical Conference Proceedings - Chicago, IL., United States
Duration: May 16 2004May 20 2004

Conference

ConferenceANTEC 2004 - Annual Technical Conference Proceedings
Country/TerritoryUnited States
CityChicago, IL.
Period05/16/0405/20/04

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