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Synthesis and Properties of Polybenzoxazole Precursors having Oligo(oxy ethylene) pendant

Oligo(oxy ethylene) pendant를 갖는 PBO 전구체의 합성 및 특성

  • Lee, Eung-Jae (Dept. of Bioenvironmental & Chemical Engineering, Chosun College University of Science & Technology) ;
  • Yoon, Doo-Soo (Dept. of Bioenvironmental & Chemical Engineering, Chosun College University of Science & Technology) ;
  • Bang, Moon-Soo (Division of Advanced Materials Science & Engineering, Kongju National University) ;
  • Choi, Jae-Kon (Dept. of Polymer Science & Engineering, Chosun University)
  • 이응재 (조선이공대학교 생명환경화공과) ;
  • 윤두수 (조선이공대학교 생명환경화공과) ;
  • 방문수 (공주대학교 신소재공학부) ;
  • 최재곤 (조선대학교 응용화학소재공학과)
  • Received : 2013.03.07
  • Accepted : 2013.05.09
  • Published : 2013.05.31

Abstract

Poly(o-hydroxyamides)(PHAs) copolymers having oligo(oxy ethylene) pendant in the main chain were synthesized by solution polycondensation reaction at low temperature. Copolymer precursors were studied by fourier transform infrared(FT-IR), differential scanning calorimeter(DSC), thermogravimetric analyzer(TGA), universal testing machine(UTM) and limited oxygen index(LOI). The inherent viscosities of the PHAs measured at $35^{\circ}C$ in DMAc or DMAc/LiCl solution were in the range of 0.74~1.42 dL/g. Solubility of the precursors with higher oligo(oxy ethylene) unit was increased, but the PBOs were nearly insoluble in a variety of solvents. The degradation temperature of the copolymer precursors was recorded in the ranges of $408{\sim}664^{\circ}C$ in nitrogen and char yields showed 13~59% values at $900^{\circ}C$. The mechanical properties and flame retardancy of copolymer precursors decreased with higher oligo(oxy ethylene) unit.

Keywords

Polybenzoxazoles;Poly(o-hydroxyamide)s;Thermal cyclization reaction

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