Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
권호 표지

Crystallization-induced Sequential Reordering in Poly (trimethylene to rephthalate)/Polycarbonate Blends

  • Bae, Woo-Jin (Hyperstructured Organic Materials Research Center and School of Materials Science and Engineering, Seoul National University) ;
  • Jo, Won-Ho (Hyperstructured Organic Materials Research Center and School of Materials Science and Engineering, Seoul National University) ;
  • Park, Yeun-Hum (Department of Textile Engineering, College of Engineering, Sungkyunkwan University)
  • Published : 2002.06.01
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Abstract

Transesterification between poly(trimethylene terephthalate) (PTT) and bisphenol-A-polycarbonate (PC) is studied by differential scanning calorimetry (DSC) and nuclear magnetic resonance (NMR) spectroscopy. When the blend of PTT/PC is annealed at higher temperatures, the samples do not show any melting peak at an initial stage, indicating the samples completely lose their crystallinity due to the formation of random copolymers. However, when the random copolymer is annealed at temperatures lower than the melting temperature of PTT, a melting peak is observed, indicating that the random copolymers are sequentially reordered. The melting point and the heat of fusion of crystals formed from the crystallization-induced sequential reordering depend upon the annealing temperature and time. The average sequence length determined from NMR is increased as the blocks are regenerated.

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