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Synthesis and Properties of Poly[p-(2,5-dihydroxy)- phenylenebenzobisoxazole] Fiber
Department of Applied Chemistry, Faculty of Science, Harbin Institute of Technology, Harbin 150001, P.R. China
* Author to whom correspondence should be addressed.
Received: 13 July 2008; in revised form: 27 October 2008 / Accepted: 29 October 2008 / Published: 5 November 2008
Abstract: The novel polymer poly[p-(2,5-dihydroxy)-phenylenebenzobisoxazole] (PBOH) fiber was synthesized in the presence of 2,5-dihydroxyterephthalicacid (DHTA) and 4,6-diamino-1,3-benzenediol in poly(phosphoric acid) (PPA) using typical polycondensation conditions. The crystalline solutions of liquid PBOH in PPA were spun into fibers using dry-jet wet spinning. Furthermore, the thermostability and mechanical properties of PBOH were compared with poly(p-phenylene-2,6-benzoxazole) (PBO) in order to investigate the relationship between the chain structure and properties. The results indicated that the thermal degradation temperature of PBOH was above 750K and the tensile strength of the PBOH fiber was 3.1GPa, which were much lower than those of PBO fiber. The compressive strength of PBOH fiber was 331 M Pa, which was slightly higher than that of PBO fiber. In addition, molecular simulation was employed to explain why the compressive strength of PBOH fiber did not increase significantly compared to PBO fiber.
Keywords: Poly[p-(2; 5-dihydroxy)-phenylenebenzobisoxazole]; Polycondensation; Compressive strength; Hydrogen bonding
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Lin, H.; Huang, Y.-D.; Wang, F. Synthesis and Properties of Poly[p-(2,5-dihydroxy)- phenylenebenzobisoxazole] Fiber. Int. J. Mol. Sci. 2008, 9, 2159-2168.
Lin H, Huang Y-D, Wang F. Synthesis and Properties of Poly[p-(2,5-dihydroxy)- phenylenebenzobisoxazole] Fiber. International Journal of Molecular Sciences. 2008; 9(11):2159-2168.
Lin, Hong; Huang, Yu-Dong; Wang, Feng. 2008. "Synthesis and Properties of Poly[p-(2,5-dihydroxy)- phenylenebenzobisoxazole] Fiber." Int. J. Mol. Sci. 9, no. 11: 2159-2168.