Annealing Treatment of Poly(ethylene terephthalate)(PET)(p-hydroxybenzonate(PHB) Liquid Crystalline Polymer

Poly(ethylene terephthalate)(PET)(p-hydroxybenzonate(PHB) 열방성 액정섬유의 열처리

  • 방윤혁 (부산대학교 섬유공학과) ;
  • 이기환 (부산대학교 섬유공학과) ;
  • 박종범 (동부산업대학 섬유디자인과) ;
  • 조현혹 (부산대학교 섬유공학과)
  • Published : 1999.09.01

Abstract

The crystal lattice structure, thermal behavior, molecular orientation, and mechanical property of spun strands of a thermotropic liquid crystalline polymer (LCP) were studied with wide angle X-ray diffraction, differential scanning calorimetry, birefringence, and tensile tests. The purpose of this work is to elucidate the effects of draw-down ratio and annealing conditions on the structural development in the LCP strands. Relaxation of the lateral packing of PHB molecular chain in a copolymer of p-hydroxibenzoic acid and ethylene terephtalate (60/40) mole%) occurred in the course of annealing treatment. The annealing treatment slightly increased the crystalline orientation factor, whereas total molecular orientation was decreased by annealing. In addition, the relationship between initial modulus and annealing treatment was sensitive to total molecular orientation. The initial modulus increased with increase in the draw-down rate. The endothermic behavior at about 20$0^{\circ}C$ is due to the PET regions with the incorporation of PHB segments causing a diluent effect.

Keywords

References

  1. Macromolecules v.16 J.Blackwell;G.Lieser;G.A.Gutierrez
  2. J. Poly. Sci. Polym. Lett. Ed. v.22 G.Geiss;W.Volksen;J.Tsay;J.Economy
  3. J. Polym. Sci. Polym. Phys. Ed. v.21 G.Leiser
  4. Polym. Commun. v.29 S.Hanna;A.H.Windle
  5. Polym. J. v.27 T.Kimura;T.Maeda;H.Sata;M.Yamato;E.Ito
  6. J. Polym. Sci. Part B : Polym. Phys. v.28 D.I.Green;G.A.J.Orchard;G.R.Davies;I.M.Ward
  7. Macromolecules v.23 A.Kaito;M.Kyotani;K.Nakayama
  8. Macromolecules v.19 Y.Takeuchi;F.Yamamoto;Y.Shuto
  9. J. Polym. Sci. Polym. Phys. v.20 W.Meesiri;J.Menczel;U.Gaur;B.Wunderlich
  10. Macromolecules v.27 W.Brostow;M.Hess;B.L.Lopez
  11. Br. Polym. J. v.12 K.F.Wissbrun
  12. J. Korean Fiber Soc. v.35 H.H.Cho.;J.B.Park;Y.A.Kang;Y.H.Bang
  13. Polymer v.26 E.Joseph;G.I.Wilkes;D.G.Baird
  14. J. Macromolecules Sci. Phys. v.B34 A.Kaito;M.Kyotani;K.Nakayama
  15. J. Polym. Sci. Part B : Polym. Phys. v.26 J.A.Cuculo;G.Y.Chen
  16. J. Polym. Sci. Polym. Phys. Ed. v.18 J.Menczel;B.Wunderlich