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http://dx.doi.org/10.7473/EC.2015.50.2.138

Synthesis and Thermal Properties of Poly(benzoxazole)s Based on Pendants  

Jang, Hyewon (R&D Center, Kern Fine Materials Co.)
Lee, Seulbi (Dept. of Biochemical & Polymer Engineering, Chosun University)
Choi, Jae Kon (Dept. of Biochemical & Polymer Engineering, Chosun University)
Publication Information
Elastomers and Composites / v.50, no.2, 2015 , pp. 138-145 More about this Journal
Abstract
A series of wholly aromatic poly(hydroxyamide)s(PHAs), containing varying amounts of 2,6-dimethylphenoxy group and quinoxaline ring in the main chain, were synthesized by a direct polycondensation method. The inherent viscosities of the PHAs in either DMAc or DMAc/LiCl solution at $35^{\circ}C$ were found to be in the range of 1.02~1.90 dL/g. In the solubility study, we observed that PHA 1, PHA 2, and PHA 3 were dissolved in aprotic solvents such as DMAc, NMP, DMF, and DMSO with LiCl on heating; however, PHA 4, PHA 5, and PHA 6 could be dissolved in aprotic solvents on heating without LiCl. For poly(benzoxazole)s(PBOs), the 10% and maximum weight loss temperatures were in the range of $582{\sim}622^{\circ}C$ and $630{\sim}659^{\circ}C$, respectively. Residues of PBOs at $900^{\circ}C$ were found to be relatively high, which were in the range of 65.3~70.8%.
Keywords
Poly(hydroxyamide)s; direct polycondensation; aprotic solvent; solubility; PBOs;
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