The effect of crystallinity on chain mobility and free volume in the amorphous regions of a miscible polycarbonate/polyester blend

M. D. Zipper, G. P. Simon, P. Cherry, A. J. Hill

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Homopolymers and blends of polycarbonate/ThermX have been investigated by differential scanning calorimetry, dynamic mechanical analysis, density measurements, and positron annihilation lifetime spectroscopy. The study focuses on the chain mobility and free volume in the amorphous miscible regions of the blends and how this mobility and free volume are affected by increasing crystallinity. It is proposed that judicious annealing, which results in increasing crystallinity (while avoiding ageing or transesterification), induces a constraint on the amorphous region leading to an increase in Tg and coalescence of free volume sites. © 1994 John Wiley & Sons, Inc.

Original languageEnglish
Pages (from-to)1237-1247
Number of pages11
JournalJournal of Polymer Science Part B: Polymer Physics
Issue number7
Publication statusPublished - 1 Jan 1994


  • free volume
  • miscible blends
  • Polycarbonate
  • positron lifetimes
  • semicrystalline polyester
  • ThermX

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