Fibers and Polymers

The Korean Fiber Society (한국섬유공학회)
권호 표지

Crystallization and Molecular Relaxation of Poly(Ethylene Terephthalate) Annealed in Supercritical Carbon Dioxide

  • Jung, Yong-Chae (Department of Textile Engineering and Next-Generation Innovative Technology Research Institute, Konkuk University) ;
  • Cho, Jae-Whan (Department of Textile Engineering and Next-Generation Innovative Technology Research Institute, Konkuk University)
  • Published : 2005.12.01
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Abstract

Poly(ethylene terephthalate) was annealed at different temperature and pressure of supercritical carbon dioxide $(CO_2)$ using samples quenched from the melt. Crystallization and molecular relaxation behavior due to $CO_2-annealing$ of samples were investigated using differential scanning calorimetric and dynamic mechanical measurements. The glass transition and crystallization temperatures significantly decreased with increasing temperature and pressure of $CO_2$. The dynamic mechanical measurement of samples annealed at $150^{\circ}C$ in supercritical $CO_2$ showed three relaxation peaks, corresponding to existence of different amorphous regimes such as rigid, intermediate, and mobile domains. As a result, the mobile chains were likely to facilitate crystallization in supercritical state. It also led to the decreased modulus of $CO_2-annealed$ samples with increasing pressure.

Keywords

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