Linear versus nonlinear determinations of equilibrium melting temperatures of poly(trimethylene terephthalate) and miscible blend with poly(ether imide) exhibiting multiple melting peaks

Pi Ling Wu, E. M. Woo

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48 Citations (Scopus)

Abstract

Multiple melting peaks in some semicrystalline polymers such as poly(trimethylene terephthalate) (PTT) have caused some difficulty in estimating accurately the equilibrium melting points. PTT forms a miscible blend with amorphous poly(ether imide) (PEI); for comparison purposes, a miscible system of a fixed composition (PTT/PEI of weight ratio = 9/1) was determined. PTT and its miscible blend both exhibited dual melting peaks (labeled as low and high peaks: Tm,L, Tm,H), and the first peaks (Tm,L), not the second peak (Tm,H), should be used for extrapolation. The equilibrium melting temperatures (Tm0) of neat PTT and its blend PTT/PEI (9/1) were 245.2 and 242.4°C, respectively, by the linear Hoffman-Weeks treatment using the corrected values of Tm,L (i.e., values obtained using a heating rate close to zero). Linear and nonlinear treatments led to a significant difference in estimated Tm0, and the relative validity of these two methods is discussed. The nonlinear estimate yielded a higher value by about 27.3°C for neat PTT and 23.1°C for the PTT/PEI (9/1) blend, respectively (also the correction in Tm,L at the same condition mentioned previously). Results showed melting depression in miscible PTT/PEI (9/1). In addition, the Tm0 value of neat PTT was higher than that of PTT/PEI (9/1) owing to much thicker and more-perfect crystals in neat PTT.

Original languageEnglish
Pages (from-to)1571-1581
Number of pages11
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume40
Issue number15
DOIs
Publication statusPublished - 2002 Aug 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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