Elastomers and Composites

The Rubber Society of Korea (한국고무학회)
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Synthesis and Properties of Polybenzoxazole Copolymers Having Non Linear Units

  • Han, So Hee (Dept. of Biochemical & Polymer Engineering, Chosun University) ;
  • Lee, Eung Jae (Dept. of Bioenvironmental & Chemical Engineering, Chosun College of Science & Technology) ;
  • Choi, Jae Kon (Dept. of Biochemical & Polymer Engineering, Chosun University)
  • Received : 2019.10.24
  • Accepted : 2019.11.22
  • Published : 2019.12.31
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Abstract

A series of poly(hyroxyamide)s (PHAs) was prepared by direct polycondensation reaction of 4,4'-(2,3-pyridinedioxy)dibenzoic acid and/or isophthalic acid with 3,3'-dihydroxybenzidine. The yield percentages of the products were high, and the inherent viscosities of the polymer in DMAc solution at 35℃ were 0.31-0.59 dL/g. All PHA polymers were found to be soluble in polar aprotic solvents such as DMAc, DMSO, NMP, and DMF. On the other hand, LiCl was required to dissolve IPHA-1 in aprotic solvents. Poly(benzoxazole)s (PBOs) were partially soluble in conc-H2SO4; IPBO-4, -5, and -6 were partially soluble in NMP only when LiCl was added to the solution, and the solution was heated. The PBO polymers showed a maximum weight loss in the temperature range of 654-680℃, and the char yields at 900℃ under nitrogen atmosphere exceeded 63%.

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