Fibers and Polymers

The Korean Fiber Society (한국섬유공학회)
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Thermal Degradation and Cyclodepolymerization of Poly(ethylene terephthalate-co-isophthalate)s

  • Yoo, Dong Il (Department of Textile Engineering, Chonnam National University) ;
  • Shin, Younsook (Department of Clothing and Textiles, Chonnam National University) ;
  • Youk, Ji Ho (Department of Chemistry, University of Alabama at Birmingham)
  • Published : 2001.06.01
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Abstract

The thermal degradation of poly(ethylene terephthalate-co-isophthalate)s (PETIs) is investigated by using isothermal thermogravimetric analysis at the temperature range of 280-31$0^{\circ}C$. The degradation rate of PETIs is increased as the mole ratio of ethylene isophthaloyl (EI) units in PETIs increases. The activation energies for the thermal degradation of poly(ethylene terephthalate), PETI(5/5), and poly(ethylene isophthalate) are 33.4, 16.6, and 8.9 kcal/mole, respectively. The degradation rate of PETIs is influenced by their volatile cyclic oligomer components formed during the polymerization and the thermal degradation. It is simulated by the rotational isomeric state model that the content of cyclic dimer in PETIs, which is the most volatile cyclic oligomer component, increases with the EI units in PETIs.

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