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Int. J. Mol. Sci. 2008, 9(11), 2159-2168; doi:10.3390/ijms9112159

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
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Author to whom correspondence should be addressed.
Received: 13 July 2008 / Revised: 27 October 2008 / Accepted: 29 October 2008 / Published: 5 November 2008
(This article belongs to the Section Biochemistry, Molecular Biology and Biophysics)
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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. View Full-Text
Keywords: Poly[p-(2; 5-dihydroxy)-phenylenebenzobisoxazole]; Polycondensation; Compressive strength; Hydrogen bonding Poly[p-(2; 5-dihydroxy)-phenylenebenzobisoxazole]; Polycondensation; Compressive strength; Hydrogen bonding
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MDPI and ACS Style

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.

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