Synthesis and properties of PBO precursors having bulky groups and ether linkages in the main chain

주사슬에 벌키그룹과 에테르 연결고리를 갖는 PBO 전구체의 합성 및 특성

  • Yoon, Doo-Soo (Dept. of Polymer Science & Engineering, Chosun University) ;
  • Kim, Hee-Sun (Dept. of Polymer Science & Engineering, Chosun University) ;
  • Choi, Jae-Kon (Dept. of Polymer Science & Engineering, Chosun University) ;
  • Hong, Wan-Hae (Dept. of Chemical Engineering, Chosun University)
  • 윤두수 (조선대학교 응용화학소재공학과) ;
  • 김희선 (조선대학교 응용화학소재공학과) ;
  • 최재곤 (조선대학교 응용화학소재공학과) ;
  • 홍완해 (조선대학교 생명화학공학과)
  • Published : 2008.12.31

Abstract

Aromatic polyhydroxyamides (PHAs) having bulky groups and ether linkages in the polymer main chain were synthesized by the low temperature solution polycondensation reaction. FT-IR, $^{1}H-NMR$, DSC, and TGA were used to study the properties of these polymers. The PHAs were converted into polybenzoxazoles (PBOs) by a thermal cyclization reaction, and endothermic peaks were observed in the range of $220{\sim}400^{\circ}C$. The introduction of the ether and bulky groups in the main chain improved the solubility of the PHAs in aprotic solvents such as DMSO and DMF, but the PBOs were nearly insoluble in common solvents. All the PBOs, except for PBO 5 with 2,6-dimethylphenoxy pendant and 2,3-dihydroxyquinoxaline ring, and PBO 6 with 2,6-dimethylphenoxy pendant and 2,3-dihydroxyquinoxaline ring, exhibited $T_g's$ in the range from 149 to $217^{\circ}C$ by DSC. The thermogravimetric analyses indicated that most of the PBOs were thermally stable up to $400^{\circ}C$ in nitrogen. Maximum weight loss temperatures of PHA 5 and PBO 5 with 2,6-dimethylphenoxy pendant and 2,3-dihydroxyquinoxaline ring were $707^{\circ}C$ and $683^{\circ}C$, respectively, which were the hightest temperatures among the corresponding copolymers. The PBOs in nitrogen exhibited relatively high char yields in the range of $63{\sim}70%$ at $900^{\circ}C$.

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