Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
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Synthesis and Thermal Properties of Poly(pentamethylene 2,6-naphthalate)

폴리(펜타메틸렌 2,6-나프탈레이트)의 합성과 열적 특성

  • Park, Sang-Wook (Department of Organic Materials and Fiber Engineering, Soongsil University) ;
  • Lee, Kyoung-Woo (Department of Organic Materials and Fiber Engineering, Soongsil University) ;
  • Kim, Young-Ho (Department of Organic Materials and Fiber Engineering, Soongsil University)
  • 박상욱 (숭실대학교 유기신소재.파이버공학과) ;
  • 이경우 (숭실대학교 유기신소재.파이버공학과) ;
  • 김영호 (숭실대학교 유기신소재.파이버공학과)
  • Published : 2008.04.30
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Abstract

Poly(pentamethylene 2,6-naphthalate) (PPN) with a intrinsic viscosity of 0.69 dl/g was synthesized from dimethyl 2,6-naphthalene dicarboxylate and 1,5-pentnandiol via a two-step process of transesterification and polycondensation using a high pressure reactor. Manganese acetate tetrahydrate and tetraisopropyl orthotitanate were used as catalysts for transesterification and polycondensation, respectively. Melt-quenched films of the PPN were prepared and annealed under various conditions, and the thermal properties of the annealed films were characterized by using a DSC and synchrotron WAXS. PPN exhibited a very slow crystallization rate. On DSC thermograms, three melting peaks were observed at around $100{\sim}125^{\circ}C$, depending on the annealing conditions. At least more than 6 hours of annealing was needed for the PPN film to be crystallized when it was annealed at a temperature below its melting point, and 3 hours of annealing when annealed at $100^{\circ}C$ which corresponds to the $T_{ml}$. From the results of DSC and WAXS analysis, it is deduced that the continuous increase in crystallinity of PPN with increasing annealing time comes from the increase in the number of crystallites, not from the increase in the crystallite size.

Keywords

References

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