Morphology and glass transition behavior of polycarbonate-phenoxy system: Effects of trans-reactions in domain interface regions

E. M. Woo, S. N. Yau

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7 Citations (Scopus)

Abstract

Effects of trans reactions on the morphology, glass transition, and phase behavior in a classical blend system of a poly(hydroxyl ether bisphenol-A) (phenoxy) with bisphenol-A polycarbonate (PC) were investigated by differential scanning calorimetry (DSC) and optical microscopy. Although two Tgs were observed in the as-prepared PC/phenoxy blends, an apparently single, but broadened. Tg was found in the blends after heating at high temperatures, typically 200-250°C for short times. The optical microscopy results indicated that same scales of heterogeneity did exist in post-heated PC/phenoxy blends as well as unheated blends. Explanations were provided. After heating-induced interchange reactions (- OH and carbonate), randomly linked polymer chains might form at the numerous interfaces of the mutually occluded/included micro-domains. The majority of the chains in the micro-domains are forced to relax in coordinated motion modes after heating, thus showing a single Tg-. A mechanism of trans reactions in interfacial regions was briefly discussed in supplement to earlier reports in the literature.

Original languageEnglish
Pages (from-to)97-103
Number of pages7
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume35
Issue number1
DOIs
Publication statusPublished - 1997 Jan 15

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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