Dilatometric studies of physical aging of polyetherimide

J. W. Sobieski, S. L. Simon, D. J. Plazek

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2 Scopus citations


Physical aging of polyetherimide (PEI) was studied using a bellows dilatometer based on Zoller's design. A linear variable differential transformer (LVDT) is used to measure the displacement of the bellows. The voltage output of the LVDT is interfaced to a computer for automated data collection. Isothermal aging experiments were carried out at temperatures near the glass temperature (206-209°C) using a constant temperature oil bath maintained at the desired aging temperature. The time required to reach equilibrium and the reduced curve produced by aging time-temperature superposition are given. The results compare well with data obtained by capillary dilatometry for the same material.

Original languageEnglish
Pages (from-to)455-460
Number of pages6
JournalJournal of Thermal Analysis
Issue number1
StatePublished - 1997


  • Glass
  • Physical aging
  • Polyetherimide
  • Volume recovery


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