Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
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Segmental Motions and Associated Dynamic Mechanical Thermal Properties of a Series of Copolymers Based on Poly(hexamethylene terephthalate) and Poly(1,4-cyclohexylenedimethylene terephthalate)

  • Jeong Young-Gyu (School of Advanced Materials and Systems Engineering, Kumoh National Institute of Technology) ;
  • Lee Sang-Cheol (School of Advanced Materials and Systems Engineering, Kumoh National Institute of Technology) ;
  • Jo Won-Ho (Hyperstructured Organic Materials Research Center and School of Materials Science and Engineering, Seoul National University)
  • Published : 2006.08.01
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Abstract

The dynamic mechanical thermal properties of poly(hexamethylene terephthalate) (PHT), poly(1,4-cyclohexylenedimethylene terephthalate) (PCT) and their P(HT-co-CT) random copolymers in the amorphous state were examined as a function of temperature and frequency. All the samples exhibited two main relaxation processes in the plot of tan ${\delta}$ versus temperature: the primary ${\alpha}$-relaxation associated with the glass transition and the secondary ${\beta}$-relaxation attributed to the local segmental motions of mostly cyclohexylene rings for PCT and to cooperative motions of methylene, carboxyl, and phenylene groups for PHT. Both ${\alpha}$- and ${\beta}$-relaxation temperatures increased with increasing CT content. The activation energy of the ${\alpha}$-relaxation increased with increasing CT content, whereas that of the ${\beta}$-relaxation decreased. The sub-glassy secondary ${\beta}$-relaxation processes of PCT and PHT were investigated in terms of the cooperativity of main-chain segmental motions.

Keywords

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